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Changelog History
Page 1

  • v4.3.1 Changes

    August 11, 2021

    πŸ› Bug Fixes

    astropy.io.fits ^

    • In fits.io.getdata do not fall back to first non-primary extension when user explicitly specifies an extension. [#11860]

    • Ensure multidimensional masked columns round-trip properly to FITS. [#11911]

    • Ensure masked times round-trip to FITS, even if multi-dimensional. [#11913]

    • Raise ValueError if an np.float32 NaN/Inf value is assigned to a header keyword. [#11922]

    astropy.modeling ^

    • πŸ›  Fixed bug in fix_inputs handling of bounding boxes. [#11908]

    astropy.table ^

    • πŸ›  Fix an error when converting to pandas any Table subclass that automatically adds a table index when the table is created. An example is a binned TimeSeries table. [#12018]

    astropy.units ^

    • Ensure that unpickling quantities and units in new sessions does not change hashes and thus cause problems with (de)composition such as getting different answers from the .si attribute. [#11879]

    • πŸ›  Fixed cannot import name imperial from astropy.units namespace. [#11977]

    astropy.utils ^

    • Ensure any .info on Masked instances is propagated correctly when viewing or slicing. As a consequence, MaskedQuantity can now be correctly written to, e.g., ECSV format with serialize_method='data_mask'. [#11910]
  • v4.3 Changes

    July 26, 2021

    πŸ†• New Features

    astropy.convolution

    • Change padding sizes for fft_pad in convolve_fft from powers of 2 only to scipy-optimized numbers, applied separately to each dimension; yielding some performance gains and avoiding potential large memory impact for certain multi-dimensional inputs. [#11533]

    astropy.coordinates

    • βž• Adds the ability to create topocentric CIRS frames. Using these, AltAz calculations are now accurate down to the milli-arcsecond level. [#10994]

    • βž• Adds a direct transformation from ICRS to AltAz frames. This provides a modest speedup of approximately 10 percent. [#11079]

    • βž• Adds new WGS84GeodeticRepresentation, WGS72GeodeticRepresentation, and GRS80GeodeticRepresentation. These are mostly for use inside EarthLocation but can also be used to convert between geocentric (cartesian) and different geodetic representations directly. [#11086]

    • SkyCoord.guess_from_table now also searches for differentials in the table. In addition, multiple regex matches can be resolved when they are exact component names, e.g. having both columns β€œdec” and β€œpm_dec” no longer errors and will be included in the SkyCoord. [#11417]

    • All representations now have a transform method, which allows them to be transformed by a 3x3 matrix in a Cartesian basis. By default, transformations are routed through CartesianRepresentation. SphericalRepresentation and PhysicssphericalRepresentation override this for speed and to prevent NaN leakage from the distance to the angular components. Also, the functions is_O3 and is_rotation have been added to matrix_utities for checking whether a matrix is in the O(3) group or is a rotation (proper or improper), respectively. [#11444]

    • 🚚 Moved angle formatting and parsing utilities to astropy.coordinates.angle_formats. Added new functionality to astropy.coordinates.angle_utilities for generating points on or in spherical surfaces, either randomly or on a grid. [#11628]

    • Added a new method to SkyCoord, spherical_offsets_by(), which is the conceptual inverse of spherical_offsets_to(): Given angular offsets in longitude and latitude, this method returns a new coordinate with the offsets applied. [#11635]

    • ♻️ Refactor conversions between GCRS and CIRS,TETE for better accuracy and substantially improved speed. [#11069]

    • 🐎 Also refactor EarthLocation.get_gcrs for an increase in performance of an order of magnitude, which enters as well in getting observed positions of planets using get_body. [#11073]

    • ♻️ Refactored the usage of metaclasses in astropy.coordinates to instead use __init_subclass__ where possible. [#11090]

    • Removed duplicate calls to transform_to from match_to_catalog_sky and match_to_catalog_3d, improving their performance. [#11449]

    • The new DE440 and DE440s ephemerides are now available via shortcuts 'de440' and 'de440s'. The DE 440s ephemeris will probably become the default ephemeris when chosing 'jpl' in 5.0. [#11601]

    astropy.cosmology

    • Cosmology parameter dictionaries now also specify the Cosmology class to which the parameters correspond. For example, the dictionary for astropy.cosmology.parameters.Planck18 has the added key-value pair ("cosmology", "FlatLambdaCDM"). [#11530]

    astropy.io.ascii ^

    • βž• Added support for reading and writing ASCII tables in QDP (Quick and Dandy Plotter) format. [#11256]

    • βž• Added support for reading and writing multidimensional column data (masked and unmasked) to ECSV. Also added formal support for reading and writing object-type column data which can contain items consisting of lists, dicts, and basic scalar types. This can be used to store columns of variable-length arrays. Both of these features use JSON to convert the object to a string that is stored in the ECSV output. [#11569, #11662, #11720]

    astropy.io.fits ^

    • βž• Added append keyword to append table objects to an existing FITS file [#2632, #11149]

    • Check that the SIMPLE card is present when opening a file, to ensure that the file is a valid FITS file and raise a better error when opening a non FITS one. ignore_missing_simple can be used to skip this verification. [#10895]

    • πŸ”¦ Expose Header.strip as a public method, to remove the most common structural keywords. [#11174]

    • Enable the use of os.PathLike objects when dealing with (mainly FITS) files. [#11580]

    astropy.io.registry

    • Readers and writers can now set a priority, to assist with resolving which format to use. [#11214]

    astropy.io.votable

    • πŸ”– Version 1.4 VOTables now use the VOUnit format specification. [#11032]

    • When reading VOTables using the Unified File Read/Write Interface (i.e. using the Table.read() or QTable.read() functions) it is now possible to specify all keyword arguments that are valid for astropy.io.votable.table.parse(). [#11643]

    astropy.modeling ^

    • βž• Added a state attribute to models to allow preventing the synching of constraint values from the constituent models. This synching can greatly slow down fitting if there are large numbers of fit parameters. model.sync_constraints = True means check constituent model constraints for compound models every time the constraint is accessed, False, do not. Fitters that support constraints will set this to False on the model copy and then set back to True when the fit is complete before returning. [#11365]

    • The convolve_models_fft function implements model convolution so that one insures that the convolution remains consistent across multiple different inputs. [#11456]

    astropy.nddata ^

    • Prevent unnecessary copies of the data during NDData arithmetic when units need to be added. [#11107]

    • NDData str representations now show units, if present. [#11553]

    astropy.stats ^

    • βž• Added the ability to specify stdfunc='mad_std' when doing sigma clipping, which will use a built-in function and lead to significant performance improvements if cenfunc is 'mean' or 'median'. [#11664]

    • 🐎 Significantly improved the performance of sigma clipping when cenfunc and stdfunc are passed as strings and the grow option is not used. [#11219]

    • πŸ‘Œ Improved performance of bayesian_blocks() by removing one np.log() call [#11356]

    astropy.table ^

    • βž• Add table attributes to include or exclude columns from the output when printing a table. This functionality includes a context manager to include/exclude columns temporarily. [#11190]

    • πŸ‘Œ Improved the string representation of objects related to Table.indices so they now indicate the object type and relevant attributes. [#11333]

    astropy.timeseries

    • πŸ‘» An exception is raised when n_bins is passed as an argument while any of the parameters time_bin_start or time_bin_size is not scalar. [#11463]

    astropy.units ^

    • The physical_type attributes of each unit are now objects of the (new) astropy.units.physical.PhysicalType class instead of strings and the function astropy.units.physical.get_physical_type can now translate strings to these objects. [#11204]

    • The function astropy.units.physical.def_physical_type was created to either define entirely new physical types, or to add more physical type names to an existing physical types. [#11204]

    • PhysicalType's can be operated on using operations multiplication, division, and exponentiation are to facilitate dimensional analysis. [#11204]

    • It is now possible to define aliases for units using astropy.units.set_enabled_aliases. This can be used when reading files that have misspelled units. [#11258]

    • βž• Add a new "DN" unit, units.dn or units.DN, representing data number for a detector. [#11591]

    astropy.utils ^

    • Added ssl_context and allow_insecure options to download_file, as well as the ability to optionally use the certifi package to provide root CA certificates when downloading from sites secured with TLS/SSL. [#10434]

    • astropy.utils.data.get_pkg_data_path is publicly scoped (previously the private function _find_pkg_data_path) for obtaining file paths without checking if the file/directory exists, as long as the package and module do. [#11006]

    • πŸ—„ Deprecated astropy.utils.OrderedDescriptor and astropy.utils.OrderedDescriptorContainer, as new features in Python 3 make their use less compelling. [#11094, #11099]

    • astropy.utils.masked provides a new Masked class/factory that can be used to represent masked ndarray and all its subclasses, including Quantity and its subclasses. These classes can be used inside coordinates, but the mask is not yet exposed. Generally, the interface should be considered experimental. [#11127, #11792]

    • βž• Add new utils.parsing module to with helper wrappers around ply. [#11227]

    • πŸ”„ Change the Time and IERS leap second handling so that the leap second table is updated only when a Time transform involving UTC is performed. Previously this update check was done the first time a Time object was created, which in practice occured when importing common astropy subpackages like astropy.coordinates. Now you can prevent querying internet resources (for instance on a cluster) by setting iers.conf.auto_download = False. This can be done after importing astropy but prior to performing any Time scale transformations related to UTC. [#11638]

    • βž• Added a new module at astropy.utils.compat.optional_deps to consolidate the definition of HAS_x optional dependency flag variables, like HAS_SCIPY. [#11490]

    astropy.wcs ^

    • βž• Add IVOA UCD mappings for some FITS WCS keywords commonly used in solar physics. [#10965]

    • βž• Add STOKES FITS WCS keyword to the IVOA UCD mapping. [#11236]

    • ⚑️ Updated bundled version of WCSLIB to version 7.6. See https://www.atnf.csiro.au/people/mcalabre/WCS/CHANGES for a list of included changes. [#11549]

    API Changes

    astropy.coordinates

    • For input to representations, subclasses of the class required for a given attribute will now be allowed in. [#11113]

    • Except for UnitSphericalRepresentation, shortcuts in representations now allow for attached differentials. [#11467]

    • πŸ‘ Allow coordinate name strings as input to SkyCoord.is_transformable_to. [#11552]

    astropy.cosmology

    • Change z_at_value to use scipy.optimize.minimize_scalar with default method Brent (other options Bounded and Golden) and accept bracket option to set initial search region. [#11080]

    • Clarified definition of inputs to angular_diameter_distance_z1z2. The function now emits AstropyUserWarning when z2 is less than z1. [#11197]

    • Split cosmology realizations from core classes, moving the former to new file realizations. [#11345]

    • Since cosmologies are immutable, the initialization signature and values can be stored, greatly simplifying cloning logic and extending it to user-defined cosmology classes that do not have attributes with the same name as each initialization argument. [#11515]

    • Cloning a cosmology with changed parameter(s) now appends "(modified)" to the new instance's name, unless a name is explicitly passed to clone. [#11536]

    • πŸ‘ Allow m_nu to be input as any quantity-like or array-like -- Quantity, array, float, str, etc. Input is passed to the Quantity constructor and converted to eV, still with the prior mass-energy equivalence enabled. [#11640]

    astropy.io.fits ^

    • For conversion between FITS tables and astropy Table, the standard mask values of NaN for float and null string for string are now properly recognized, leading to a MaskedColumn with appropriately set mask instead of a Column with those values exposed. Conversely, when writing an astropy Table to a FITS tables, masked values are now consistently converted to the standard FITS mask values of NaN for float and null string for string (i.e., not just for tables with masked=True, which no longer is guaranteed to signal the presence of MaskedColumn). [#11222]

    astropy.io.votable

    • πŸ—„ The use of version='1.0' is now fully deprecated in constructing a astropy.io.votable.tree.VOTableFile. [#11659]

    astropy.modeling ^

    • βœ‚ Removed deprecated astropy.modeling.blackbody module. [#10972]

    astropy.table ^

    • βž• Added Column.value as an alias for the existing Column.data attribute. This makes accessing a column's underlying data array consistent with the .value attribute available for Time and Quantity objects. [#10962]

    • In reading from a FITS tables, the standard mask values of NaN for float and null string for string are properly recognized, leading to a MaskedColumn with appropriately set mask. [#11222]

    • πŸ”„ Changed the implementation of the table.index.Index class so instantiating from this class now returns an Index object as expected instead of a SlicedIndex object. [#11333]

    astropy.units ^

    • The physical_type attribute of units now returns an instance of astropy.units.physical.PhysicalType instead of a string. Because PhysicalType instances can be compared to strings, no code changes should be necessary when making comparisons. The string representations of different physical types will differ from previous releases. [#11204]

    • Calling Unit() with no argument now returns a dimensionless unit, as was documented but not implemented. [#11295]

    astropy.utils ^

    • βœ‚ Removed deprecated utils.misc.InheritDocstrings and utils.timer. [#10281]

    • βœ‚ Removed usage of deprecated ipython stream in utils.console. [#10942]

    astropy.wcs ^

    • πŸ—„ Deprecate accuracy argument in all_world2pix which was mistakenly documented, in the case accuracy was ever used. [#11055]

    πŸ› Bug Fixes

    astropy.convolution

    • πŸ›  Fixes for convolve_fft documentation examples. [#11510]

    astropy.coordinates

    • πŸ‘ Allow Distance instances with negative distance values as input for SphericalRepresentation. This was always noted as allowed in an exception message when a negative Quantity with length units was passed in, but was not actually possible to do. [#11113]

    • πŸ‘‰ Makes the Angle.to_string method to follow the format described in the docstring with up to 8 significant decimals instead of 4. [#11153]

    • Ensure that proper motions can be calculated when converting a SkyCoord with cartesian representation to unit-spherical, by fixing the conversion of CartesianDifferential to UnitSphericalDifferential. [#11469]

    • When re-representing coordinates from spherical to unit-spherical and vice versa, the type of differential will now be preserved. For instance, if only a radial velocity was present, that will remain the case (previously, a zero proper motion component was added). [#11482]

    • ⚠ Ensure that wrapping of Angle does not raise a warning even if nan are present. Also try to make sure that the result is within the wrapped range even in the presence of rounding errors. [#11568]

    • Comparing a non-SkyCoord object to a SkyCoord using == no longer raises an error. [#11666]

    • Different SkyOffsetFrame classes no longer interfere with each other, causing difficult to debug problems with the origin attribute. The origin attribute now no longer is propagated, so while it remains available on a SkyCoord that is an offset, it no longer is available once that coordinate is transformed to another frame. [#11730] [#11730]

    astropy.cosmology

    • Cosmology instance names are now immutable. [#11535]

    astropy.io.ascii ^

    • πŸ›  Fixed bug where writing a table that has comments defined (via tbl.meta['comments']) with the 'csv' format was failing. Since the formally defined CSV format does not support comments, the comments are now just ignored unless comment=<comment prefix> is supplied to the write() call. [#11475]

    • πŸ›  Fixed the issue where the CDS reader failed to treat columns as nullable if the ReadMe file contains a limits specifier. [#11531]

    • Made sure that the CDS reader does not ignore an order specifier that may be present after the null specifier '?'. Also made sure that it checks null values only when an '=' symbol is present and reads description text even if there is no whitespace after '?'. [#11593]

    astropy.io.fits ^

    • Fix ColDefs.add_col/del_col to allow in-place addition or removal of a column. [#11338]

    • πŸ›  Fix indexing of fits.Header with Numpy integers. [#11387]

    • 0️⃣ Do not delete EXTNAME for compressed image header if a default and non-default EXTNAME are present. [#11396]

    • ⚠ Prevent warnings about HIERARCH with CompImageHeader class. [#11404]

    • πŸ›  Fixed regression introduced in Astropy 4.0.5 and 4.2.1 with verification of FITS headers with HISTORY or COMMENT cards with long (> 72 characters) values. [#11487]

    • πŸ›  Fix reading variable-length arrays when there is a gap between the data and the heap. [#11688]

    astropy.io.votable

    • NumericArray converter now properly broadcasts scalar mask to array. [#11157]

    • VOTables are now written with the correct namespace and schema location attributes. [#11659]

    astropy.modeling ^

    • πŸ›  Fixes the improper propagation of bounding_box from astropy.modeling.models to their inverses. For cases in which the inverses bounding_box can be determined, the proper calculation has been implemented. [#11414]

    • πŸ›  Bugfix to allow rotation models to accept arbitrarily-shaped inputs. [#11435]

    • πŸ›  Bugfixes for astropy.modeling to allow fix_inputs to accept empty dictionaries and dictionaries with numpy integer keys. [#11443]

    • πŸ›  Bugfix for how SPECIAL_OPERATORS are handled. [#11512]

    • πŸ›  Fixes Model crashes when some inputs are scalars and during some types of output reshaping. [#11548]

    • πŸ›  Fixed bug in LevMarLSQFitter when using weights and vector inputs. [#11603]

    astropy.stats ^

    • πŸ›  Fixed a bug with the copy=False option when carrying out sigma clipping - previously if masked=False this still copied the data, but this will now change the array in-place. [#11219]

    astropy.table ^

    • Ensure that adding a Quantity or other mixin column to a Table does not have side effects, such as creating an associated info instance (which would lead to slow-down of, e.g., slicing afterwards). [#11077]

    • When writing to a FITS tables, masked values are again always converted to the standard FITS mask values of NaN for float and null string for string, not just for table with masked=True. [#11222]

    • Using Table.to_pandas() on an indexed Table with masked integer values now correctly construct the pandas.DataFrame. [#11432]

    • πŸ›  Fixed Table HTML representation in Jupyter notebooks so that it is horizontally scrollable within Visual Studio Code. This was done by wrapping the <table> in a <div> element. [#11476]

    • πŸ›  Fix a bug where a string-valued Column that happened to have a unit attribute could not be added to a QTable. Such columns are now simply kept as Column instances (with a warning). [#11585]

    • πŸ›  Fix an issue in Table.to_pandas(index=<colname>) where the index column name was not being set properly for the DataFrame index. This was introduced by an API change in pandas version 1.3.0. Previously when creating a DataFrame with the index set to an astropy Column, the DataFrame index name was automatically set to the column name. [#11921]

    astropy.time ^

    • πŸ›  Fix a thread-safety issue with initialization of the leap-second table (which is only an issue when ERFA's built-in table is out of date). [#11234]

    • πŸ›  Fixed converting a zero-length time object from UTC to UT1 when an empty array is passed. [#11516]

    astropy.uncertainty

    • Distribution instances can now be used as input to Quantity to initialize QuantityDistribution. Hence, distribution * unit and distribution << unit will work too. [#11210]

    astropy.units ^

    • 🚚 Move non-astronomy units from astrophys.py to a new misc.py file. [#11142]

    • The physical type of astropy.units.mol / astropy.units.m ** 3 is now defined as molar concentration. It was previously incorrectly defined as molar volume. [#11204]

    • πŸ‘‰ Make ufunc helper lookup thread-safe. [#11226]

    • πŸ“œ Make Unit string parsing (as well as Angle parsing) thread-safe. [#11227]

    • Decorator astropy.units.decorators.quantity_input now only evaluates return type annotations based on UnitBase or FunctionUnitBase types. Other annotations are skipped over and are not attempted to convert to the correct type. [#11506]

    astropy.utils ^

    • πŸ‘‰ Make lazyproperty and classdecorator thread-safe. This should fix a number of thread safety issues. [#11224]

    astropy.visualization

    • πŸ›  Fixed a bug that resulted in some parts of grid lines being visible when they should have been hidden. [#11380]

    • πŸ›  Fixed a bug that resulted in time_support() failing for intervals of a few months if one of the ticks was the month December. [#11615]

    astropy.wcs ^

    • fit_wcs_from_points now produces a WCS with integer NAXIXn values. [#10865]

    • ⚑️ Updated bundled version of WCSLIB to v7.4, fixing a bug that caused the coefficients of the TPD distortion function to not be written to the header. [#11260]

    • πŸ›  Fixed a bug in assigning type when converting colsel to numpy.ndarray. [#11431]

    • βž• Added WCSCOMPARE_* constants to the list of WCSLIB constants available/exposed through the astropy.wcs module. [#11647]

    • πŸ›  Fix a bug that caused APE 14 WCS transformations for FITS WCS with ZOPT, BETA, VELO, VOPT, or VRAD CTYPE to not work correctly. [#11781]

    Other Changes and Additions

    • πŸ”§ The configuration file is no longer created by default when importing astropy and its existence is no longer required. Affiliated packages should update their __init__.py module to remove the block using update_default_config and ConfigurationDefaultMissingWarning. [#10877]

    • πŸ“‡ Replace pkg_resources (from setuptools) with importlib.metadata which comes from the stdlib, except for Python 3.7 where the backport package is added as a new dependency. [#11091]

    • Turn on numpydoc's numpydoc_xref_param_type to create cross-references for the parameter types in the Parameters, Other Parameters, Returns and Yields sections of the docstrings. [#11118]

    • πŸ“„ Docstrings across the package are standardized to enable references. Also added is an Astropy glossary-of-terms to define standard inputs, e.g. quantity-like indicates an input that can be interpreted by astropy.units.Quantity. [#11118]

    • 🐧 Binary wheels are now built to the manylinux2010 specification. These wheels should be supported on all versions of pip shipped with Python 3.7+. [#11377]

    • 0️⃣ The name of the default branch for the astropy git repository has been renamed to main, and the documentation and tooling has been updated accordingly. If you have made a local clone you may wish to update it following the instructions in the repository's README. [#11379]

    • Sphinx cross-reference link targets are added for every PhysicalType. Now in the parameter types in the Parameters, Other Parameters, Returns and Yields sections of the docstring, the physical type of a quantity can be annotated in square brackets. E.g. distance : `~astropy.units.Quantity` ['length'] [#11595]

    • πŸ‘ The minimum supported version of ipython is now 4.2. [#10942]

    • πŸ‘ The minimum supported version of pyerfa is now 1.7.3. [#11637]

  • v4.2.1 Changes

    April 01, 2021

    πŸ› Bug Fixes

    astropy.cosmology

    • πŸ›  Fixed an issue where specializations of the comoving distance calculation for certain cosmologies could not handle redshift arrays. [#10980]

    astropy.io.fits ^

    • πŸ›  Fix bug where manual fixes to invalid header cards were not preserved when saving a FITS file. [#11108]

    astropy.io.votable

    • NumericArray converter now properly broadcasts scalar mask to array. [#11157]

    astropy.table ^

    • πŸ›  Fix bug when initializing a Table subclass that uses TableAttribute's. If the data were an instance of the table then attributes provided in the table initialization call could be ignored. [#11217]

    astropy.time ^

    • πŸ”„ Change epoch of TimeUnixTAI ("unix_tai") from 1970-01-01T00:00:00 UTC to 1970-01-01T00:00:00 TAI to match the intended and documented behaviour. This essentially changes the resulting times by 8.000082 seconds, the initial offset between TAI and UTC. [#11249]

    astropy.units ^

    • πŸ›  Fixed a bug with the quantity_input decorator where allowing dimensionless inputs for an argument inadvertently disabled any checking of compatible units for that argument. [#11283]

    astropy.utils ^

    • πŸ›  Fix a bug so that np.shape, np.ndim and np.size again work on classes that use ShapedLikeNDArray, like representations, frames, sky coordinates, and times. [#11133]

    astropy.wcs ^

    • Fix error when a user defined proj_point parameter is passed to fit_wcs_from_points. [#11139]

    Other Changes and Additions

    • πŸ”„ Change epoch of TimeUnixTAI ("unix_tai") from 1970-01-01T00:00:00 UTC to 1970-01-01T00:00:00 TAI to match the intended and documented behaviour. This essentially changes the resulting times by 8.000082 seconds, the initial offset between TAI and UTC. [#11249]
  • v4.2 Changes

    November 24, 2020

    πŸ†• New Features

    astropy.convolution

    • Methods convolve and convolve_fft both now return Quantity arrays if user input is given in one. [#10822]

    astropy.coordinates

    • Numpy functions that broadcast, change shape, or index (like np.broadcast_to, np.rot90, or np.roll) now work on coordinates, frames, and representations. [#10337]

    • Add a new science state astropy.coordinates.erfa_astrom.erfa_astrom and two classes ErfaAstrom, ErfaAstromInterpolator as wrappers to the pyerfa astrometric functions used in the coordinate transforms. Using ErfaAstromInterpolator, which interpolates astrometric properties for SkyCoord instances with arrays of obstime, can dramatically speed up coordinate transformations while keeping microarcsecond resolution. Depending on needed precision and the obstime array in question, speed ups reach factors of 10x to >100x. [#10647]

    • galactocentric_frame_defaults can now also be used as a registry, with user-defined parameter values and metadata. [#10624]

    • Method .realize_frame from coordinate frames now accepts **kwargs, including representation_type. [#10727]

    • Avoid an unnecessary call to erfa.epv00 in transformations between CIRS and ICRS, improving performance by 50 %. [#10814]

    • A new equatorial coordinate frame, with RA and Dec measured w.r.t to the True Equator and Equinox (TETE). This frame is commonly known as "apparent place" and is the correct frame for coordinates returned from JPL Horizons. [#10867]

    • Added a context manager impose_finite_difference_dt to the TransformGraph class to override the finite-difference time step attribute (finite_difference_dt) for all transformations in the graph with that attribute. [#10341]

    • πŸ‘Œ Improve performance of SpectralCoord by refactoring internal implementation. [#10398]

    astropy.cosmology

    • The final version of the Planck 2018 cosmological parameters are included as the Planck18 object, which is now the default cosmology. The parameters are identical to those of the Planck18_arXiv_v2 object, which is now deprecated and will be removed in a future release. [#10915]

    astropy.modeling ^

    • βž• Added NFW profile and tests to modeling package [#10505]

    • βž• Added missing logic for evaluate to compound models [#10002]

    • Stop iteration in FittingWithOutlierRemoval before reaching niter if the masked points are no longer changing. [#10642]

    • Keep a (shallow) copy of fit_info from the last iteration of the wrapped fitter in FittingWithOutlierRemoval and also record the actual number of iterations performed in it. [#10642]

    • βž• Added attributes for fitting uncertainties (covariance matrix, standard deviations) to models. Parameter covariance matrix can be accessed via model.cov_matrix, standard deviations by model.stds or individually for each parameter by parameter.std. Currently implemented for LinearLSQFitter and LevMarLSQFitter. [#10552]

    • N-dimensional least-squares statistic and specific 1,2,3-D methods [#10670]

    astropy.stats ^

    • βž• Added circstd function to obtain a circular standard deviation. [#10690]

    astropy.table ^

    • πŸ‘ Allow initializing a Table using a list of names in conjunction with a dtype from a numpy structured array. The list of names overrides the names specified in the dtype. [#10419]

    astropy.time ^

    • βž• Add new isclose() method to Time and TimeDelta classes to allow comparison of time objects to within a specified tolerance. [#10646]

    • πŸ‘Œ Improve initialization time by a factor of four when creating a scalar Time object in a format like unix or cxcsec (time delta from a reference epoch time). [#10406]

    • πŸ‘Œ Improve initialization time by a factor of ~25 or more for large arrays of string times in ISO, ISOT or year day-of-year formats. This is done with a new C-based time parser that can be adapted for other fixed-format custom time formats. [#10360]

    • Numpy functions that broadcast, change shape, or index (like np.broadcast_to, np.rot90, or np.roll) now work on times. [#10337, #10502]

    astropy.timeseries

    • πŸ‘Œ Improve memory and speed performance when iterating over the entire time column of a TimeSeries object. Previously this involved O(N2) operations and memory. [#10889]

    astropy.units ^

    • Quantity.to has gained a copy option to allow copies to be avoided when the units do not change. [#10517]

    • βž• Added the spat unit of solid angle that represents the full sphere. [#10726]

    astropy.utils ^

    • ShapedLikeNDArray has gained the capability to use numpy functions that broadcast, change shape, or index. [#10337]

    • πŸ†“ get_free_space_in_dir now takes a new unit keyword and check_free_space_in_dir takes size defined as Quantity. [#10627]

    • πŸ†• New astropy.utils.data.conf.allow_internet configuration item to control downloading data from the Internet. Setting allow_internet=False is the same as remote_timeout=0. Using remote_timeout=0 to control internet access will stop working in a future release. [#10632]

    • πŸ†• New is_url function so downstream packages do not have to secretly use the hidden _is_url anymore. [#10684]

    astropy.visualization

    • βž• Added the Quadrangle patch for WCSAxes for a latitude-longitude quadrangle. Unlike matplotlib.patches.Rectangle, the edges of this patch will be rendered as curved lines if appropriate for the WCS transformation. [#10862]

    • The position of tick labels are now only calculated when needed. If any text parameters are changed (color, font weight, size etc.) that don't effect the tick label position, the positions are not recomputed, improving performance. [#10806]

    astropy.wcs ^

    • WCS.to_header() now appends comments to SIP coefficients. [#10480]

    • A new property dropped_world_dimensions has been added to SlicedLowLevelWCS to record information about any world axes removed by slicing a WCS. [#10195]

    • New WCS.proj_plane_pixel_scales() and WCS.proj_plane_pixel_area() methods to return pixel scales and area, respectively, as Quantity. [#10872]

    API Changes

    astropy.config ^

    • set_temp_config now preserves the existing cache rather than deleting it and relying on reloading it from the previous config file. This ensures that any programmatically made changes are preserved as well. [#10474]

    • πŸ”§ Configuration path detection logic has changed: Now, it looks for ~ first before falling back to older logic. In addition, HOMESHARE is no longer used in Windows. [#10705]

    astropy.coordinates

    • The passing of frame classes (as opposed to frame instances) to the transform_to() methods of low-level coordinate-frame classes has been deprecated. Frame classes can still be passed to the transform_to() method of the high-level SkyCoord class, and using SkyCoord is recommended for all typical use cases of transforming coordinates. [#10475]

    astropy.stats ^

    • βž• Added a grow parameter to SigmaClip, sigma_clip and sigma_clipped_stats, to allow expanding the masking of each deviant value to its neighbours within a specified radius. [#10613]

    • Passing float n to poisson_conf_interval when using interval='kraft-burrows-nousek' now raises TypeError as its value must be an integer. [#10838]

    astropy.table ^

    • πŸ”„ Change Table.columns.keys() and Table.columns.values() to both return generators instead of a list. This matches the behavior for Python dict objects. [#10543]

    • βœ‚ Removed the FastBST and FastRBT indexing engines because they depend on the bintrees package, which is no longer maintained and is deprecated. Instead, use the SCEngine indexing engine, which is similar in performance and relies on the sortedcontainers package. [#10622]

    • When slicing a mixin column in a table that had indices, the indices are no longer copied since they generally are not useful, having the wrong shape. With this, the behaviour becomes the same as that for a regular Column. (Note that this does not affect slicing of a table; sliced columns in those will continue to carry a sliced version of any indices). [#10890]

    • πŸ”„ Change behavior so that when getting a single item out of a mixin column such as Time, TimeDelta, SkyCoord or Quantity, the info attribute is no longer copied. This improves performance, especially when the object is an indexed column in a Table. [#10889]

    • Raise a TypeError when a scalar column is added to an unsized table. [#10476]

    • The order of columns when creating a table from a list of dict may be changed. Previously, the order was alphabetical because the dict keys were assumed to be in random order. Since Python 3.7, the keys are always in order of insertion, so Table now uses the order of keys in the first row to set the column order. To alphabetize the columns to match the previous behavior, use t = t[sorted(t.colnames)]. [#10900]

    astropy.time ^

    • ♻️ Refactor Time and TimeDelta classes to inherit from a common TimeBase class. The TimeDelta class no longer inherits from Time. A number of methods that only apply to Time (e.g. light_travel_time) are no longer available in the TimeDelta class. [#10656]

    astropy.units ^

    • The bar unit is no longer wrongly considered an SI unit, meaning that SI decompositions like (u.kg*u.s**-2* u.sr**-1 * u.nm**-1).si will no longer include it. [#10586]

    astropy.utils ^

    • Shape-related items from astropy.utils.misc -- ShapedLikeNDArray, check_broadcast, unbroadcast, and IncompatibleShapeError -- have been moved to their own module, astropy.utils.shapes. They remain importable from astropy.utils. [#10337]

    • check_hashes keyword in check_download_cache is deprecated and will be removed in a future release. [#10628]

    • hexdigest keyword in import_file_to_cache is deprecated and will be removed in a future release. [#10628]

    πŸ› Bug Fixes

    astropy.config ^

    • πŸ›  Fix a few issues with generate_config when used with other packages. [#10893]

    astropy.coordinates

    • πŸ›  Fixed a bug in the coordinate-frame attribute CoordinateAttribute where the internal transformation could behave differently depending on whether the input was a low-level coordinate frame or a high-level SkyCoord. CoordinateAttribute now always performs a SkyCoord-style internal transformation, including the by-default merging of frame attributes. [#10475]

    astropy.modeling ^

    • πŸ›  Fixed an issue of Model.render when the input out datatype is not float64. [#10542]

    astropy.visualization

    • πŸ›  Fix support for referencing WCSAxes coordinates by their world axes names. [#10484]

    astropy.wcs ^

    • Objective functions called by astropy.wcs.fit_wcs_from_points were treating longitude and latitude distances equally. Now longitude scaled properly. [#10759]

    Other Changes and Additions

    • Minimum version of required Python is now 3.7. [#10900]

    • Minimum version of required Numpy is now 1.17. [#10664]

    • Minimum version of required Scipy is now 1.1. [#10900]

    • Minimum version of required PyYAML is now 3.13. [#10900]

    • Minimum version of required Matplotlib is now 3.0. [#10900]

    • πŸ“¦ The private _erfa module has been converted to its own package, pyerfa, which is a required dependency for astropy, and can be imported with import erfa. Importing _erfa from astropy will give a deprecation warning. [#10329]

    • βž• Added optimize=True flag to calls of yacc.yacc (as already done for lex.lex) to allow running in python -OO session without raising an exception in astropy.units.format. [#10379]

    • Shortened FITS comment strings for some D2IM and CPDIS FITS keywords to reduce the number of FITS VerifyWarning warnings when working with WCSes containing lookup table distortions. [#10513]

    • πŸ— When importing astropy without first building the extension modules first, raise an error directly instead of trying to auto-build. [#10883]

  • v4.1.1 Changes

    πŸ› Bug Fixes

    astropy.config ^

    astropy.constants

    astropy.convolution

    astropy.coordinates

    astropy.cosmology

    astropy.extern ^

    astropy.io.ascii ^

    astropy.io.fits ^

    astropy.io.misc ^

    astropy.io.votable

    • No longer ignore attributes whose values were specified as empty strings. [#10583]

    astropy.modeling ^

    astropy.nddata ^

    astropy.samp ^

    astropy.stats ^

    astropy.table ^

    βœ… astropy.tests ^

    astropy.time ^

    astropy.timeseries

    astropy.uncertainty

    astropy.units ^

    astropy.utils ^

    astropy.visualization

    • πŸ›  Fixed an issue where ticks were sometimes not drawn at the edges of a spherical projection on a WCSAxes. [#10442]

    astropy.wcs ^

    • βž• Add .upper() to ctype or ctype names to wcsapi/fitwcs.py to mitigate bugs from unintended lower/upper case issues [#10557]
    • Added bounds to fit_wcs_from_points to ensure CRPIX is on input image. [#10346]

    Other Changes and Additions

  • v4.1 Changes

    October 21, 2020

    πŸ†• New Features

    astropy.config ^

    • βž• Add new function generate_config to generate the configuration file and include it in the documentation. [#10148]

    • ConfigNamespace.__iter__ and ConfigNamespace.keys now yield ConfigItem names defined within it. Similarly, items and values would yield like a Python dictionary would. [#10139]

    astropy.constants

    astropy.convolution

    astropy.coordinates

    • βž• Added a new SpectralCoord class that can be used to define spectral coordinates and transform them between different velocity frames. [#10185]

    • πŸ“œ Angle parsing now supports cardinal direction in the cases where angles are initialized as string instances. eg "17Β°53'27"W".[#9859]

    • πŸ‘ Allow in-place modification of array-valued Frame and SkyCoord objects. This provides limited support for updating coordinate data values from another coordinate object of the same class and equivalent frame attributes. [#9857]

    • βž• Added a robust equality operator for comparing SkyCoord, frame, and representation objects. A comparison like sc1 == sc2 will now return a boolean or boolean array where the objects are strictly equal in all relevant frame attributes and coordinate representation values. [#10154]

    • βž• Added the True Equator Mean Equinox (TEME) frame. [#10149]

    • βœ… The Galactocentric frame will now use the "latest" parameter definitions by default. This currently corresponds to the values defined in v4.0, but will change with future releases. [#10238]

    • The SkyCoord.from_name() and Sesame name resolving functionality now is able to cache results locally and will do so by default. [#9162]

    • πŸ‘ Allow in-place modification of array-valued Representation and Differential objects, including of representations with attached differentials. [#10210]

    astropy.cosmology

    astropy.extern ^

    astropy.io.ascii ^

    • Functional Units can now be processed in CDS-tables. [#9971]

    • πŸ‘ Allow reading in ASCII tables which have duplicate column names. [#9939]

    • Fixed failure of ASCII fast_reader to handle names, include_names, exclude_names arguments for RDB formatted tables. Homogenised checks and exceptions for invalid names arguments. Improved performance when parsing "wide" tables with many columns. [#10306]

    • βž• Added type validation of key arguments in calls to io.ascii.read() and io.ascii.write() functions. [#10005]

    astropy.io.misc ^

    • βž• Added serialization of parameter constraints fixed and bounds. [#10082]

    • Added 'functional_models.py' and 'physical_models.py' to asdf/tags/transform, with to allow serialization of all functional and physical models. [#10028, #10293]

    • πŸ›  Fix ASDF serialization of circular model inverses, and remove explicit calls to asdf.yamlutil functions that became unnecessary in asdf 2.6.0. [#10189, #10384]

    astropy.io.fits ^

    • βž• Added support for writing Dask arrays to disk efficiently for ImageHDU and PrimaryHDU. [#9742]

    • βž• Add HDU name and ver to FITSDiff report where appropriate [#10197]

    astropy.io.registry

    astropy.io.votable

    • πŸ†• New exceptions.conf.max_warnings configuration item to control the number of times a type of warning appears before being suppressed. [#10152]

    astropy.modeling ^

    • βž• Added Plummer1D model to functional_models. [#9896]

    • βž• Added UnitsMapping model and Model.coerce_units to support units on otherwise unitless models. [#9936]

    • βž• Added domain and window attributes to repr and str. Fixed bug with _format_repr in core.py. [#9941]

    • Polynomial attributes domain and window are now tuples of size 2 and are validated. repr and print show only their non-default values. [#10145]

    • βž• Added replace_submodel() method to CompoundModel to modify an existing instance. [#10176]

    • Delay construction of CompoundModel inverse until property is accessed, to support ASDF deserialization of circular inverses in component models. [#10384]

    astropy.nddata ^

    • βž• Added support in the bitmask module for using mnemonic bit flag names when specifying the bit flags to be used or ignored when converting a bit field to a boolean. [#10095, #10208]

    • Added reshape_as_blocks function to reshape a data array into blocks, which is useful to efficiently apply functions on block subsets of the data instead of using loops. The reshaped array is a view of the input data array. [#10214]

    • βž• Added a cache keyword option to allow caching for CCDData.read if filename is a URL. [#10265]

    astropy.samp ^

    astropy.stats ^

    astropy.table ^

    • βž• Added ability to specify a custom matching function for table joins. In particular this makes it possible to do cross-match table joins on SkyCoord, Quantity, or standard columns, where column entries within a specified distance are considered to be matched. [#10169]

    • βž• Added units and descriptions keyword arguments to the Table object initialization and Table.read() methods. This allows directly setting the unit and description for the table columns at the time of creating or reading the table. [#9671]

    • πŸ‘‰ Make table Row work as mappings, by adding .keys() and .values() methods. With this **row becomes possible, as does, more simply, turning a Row into a dictionary with dict(row). [#9712]

    • βž• Added two new Table methods .items() and .values(), which return respectively tbl.columns.items() (iterator over name, column tuples) and tbl.columns.values() (list of columns) for a Table object tbl. [#9780]

    • βž• Added new Table method .round(), which rounds numeric columns to the specified number of decimals. [#9862]

    • Updated to_pandas() and from_pandas() to use and support Pandas nullable integer data type for masked integer data. [#9541]

    • The HDF5 writer, write_table_hdf5(), now allows passing through additional keyword arguments to the h5py.Group.create_dataset(). [#9602]

    • βž• Added capability to add custom table attributes to a Table subclass. These attributes are persistent and can be set during table creation. [#10097]

    • βž• Added support for SkyCoord mixin columns in dstack, vstack and insert_row functions. [#9857]

    • βž• Added support for coordinate Representation and Differential mixin columns. [#10210]

    βœ… astropy.tests ^

    astropy.time ^

    • βž• Added a new time format unix_tai which is essentially Unix time but with leap seconds included. More precisely, this is the number of seconds since 1970-01-01 00:00:08 TAI and corresponds to the CLOCK_TAI clock available on some linux platforms. [#10081]

    astropy.timeseries

    astropy.uncertainty

    astropy.units ^

    • βž• Added torr pressure unit. [#9787]

    • βž• Added the equal_nan keyword argument to isclose and allclose, and updated the docstrings. [#9849]

    • βž• Added Rankine temperature unit. [#9916]

    • βž• Added integrated flux unit conversion to spectral_density equivalency. [#10015]

    • πŸ”„ Changed pixel_scale equivalency to allow scales defined in any unit. [#10123]

    • The quantity_input decorator now optionally allows passing through numeric values or numpy arrays with numeric dtypes to arguments where dimensionless_unscaled is an allowed unit. [#10232]

    astropy.utils ^

    • βž• Added a new MetaAttribute class to support easily adding custom attributes to a subclass of classes like Table or NDData that have a meta attribute. [#10097]

    astropy.visualization

    • βž• Added invalid keyword to SqrtStretch, LogStretch, PowerStretch, and ImageNormalize classes and the simple_norm function. This keyword is used to replace generated NaN values. [#10182]

    astropy.wcs ^

    • WCS objects with a spectral axis will now return SpectralCoord objects when calling pixel_to_world instead of Quantity, and can now take either Quantity or SpectralCoord as input to pixel_to_world. [#10185]

    • πŸ‘ Implemented support for the -TAB algorithm (WCS Paper III). [#9641]

    • Added an _as_mpl_axes method to the HightLevelWCSWrapper class. [#10138]

    API Changes

    astropy.config ^

    astropy.constants

    astropy.convolution

    astropy.coordinates

    • The equality operator for comparing SkyCoord, frame, and representation objects was changed. A comparison like sc1 == sc2 was previously equivalent to sc1 is sc2. It will now return a boolean or boolean array where the objects are strictly equal in all relevant frame attributes and coordinate representation values. If the objects have different frame attributes or representation types then an exception will be raised. [#10154]

    • SkyCoord.radial_velocity_correction now allows you to pass an obstime directly when the SkyCoord also has an obstime set. In this situation, the position of the SkyCoord has space motion applied to correct to the passed obstime. This allows mm/s radial velocity precision for objects with large space motion. [#10094]

    • For consistency with other astropy classes, coordinate Representations and Differentials can now be initialized with an instance of their own class if that instance is passed in as the first argument. [#10210]

    astropy.cosmology

    astropy.extern ^

    astropy.io.ascii ^

    • πŸ”„ Changed the behavior when reading a table where both the names argument is provided (to specify the output column names) and the converters argument is provided (to specify column conversion functions). Previously the converters dict names referred to the input table column names, but now they refer to the output table column names. [#9739]

    astropy.io.misc ^

    astropy.io.fits ^

    astropy.io.registry

    astropy.io.votable

    astropy.modeling ^

    astropy.nddata ^

    astropy.samp ^

    astropy.stats ^

    astropy.table ^

    • πŸ‘ Table.from_pandas now supports a units dictionary as argument to pass units for columns in the DataFrame. [#9472]

    βœ… astropy.tests ^

    astropy.time ^

    • Require that in_subfmt and out_subfmt properties of a Time object have allowed values at the time of being set, either when creating the object or when setting those properties on an existing Time instance. Previously the validation of those properties was not strictly enforced. [#9868]

    astropy.timeseries

    astropy.uncertainty

    astropy.units ^

    astropy.utils ^

    • Changed the exception raised by get_readable_fileobj on missing compression modules (for bz2 or lzma/xz support) to ModuleNotFoundError, consistent with io.fits file handlers. [#9761]

    astropy.visualization

    • Deprecated the imshow_only_kwargs keyword in imshow_norm. [#9915]

    • Non-finite input values are now automatically excluded in HistEqStretch and InvertedHistEqStretch. [#10177]

    • The PowerDistStretch and InvertedPowerDistStretch a value is restricted to be a >= 0 in addition to a != 1. [#10177]

    • πŸ”Š The PowerStretch, LogStretch, and InvertedLogStretch a value is restricted to be a > 0. [#10177]

    • The AsinhStretch and SinhStretch a value is restricted to be 0 < a <= 1. [#10177]

    astropy.wcs ^

    πŸ› Bug Fixes

    astropy.config ^

    astropy.constants

    astropy.convolution

    astropy.coordinates

    astropy.cosmology

    astropy.extern ^

    astropy.io.ascii ^

    astropy.io.misc ^

    astropy.io.fits ^

    astropy.io.registry

    astropy.io.votable

    • For FIELDs with datatype="char", store the values as strings instead of bytes. [#9505]

    astropy.modeling ^ astropy.nddata ^

    astropy.samp ^

    astropy.stats ^

    astropy.table ^

    βœ… astropy.tests ^

    astropy.time ^

    astropy.timeseries

    astropy.uncertainty

    astropy.units ^

    astropy.utils ^

    astropy.visualization

    astropy.wcs ^

    • WCS objects with a spectral axis will now return SpectralCoord objects when calling pixel_to_world instead of Quantity (note that SpectralCoord is a sub-class of Quantity). [#10185]

    Other Changes and Additions

    • πŸ— The way in which users can specify whether to build astropy against existing installations of C libraries rather than the bundled one has changed, and should now be done via environment variables rather than setup.py flags (e.g. --use-system-erfa). The available variables are ASTROPY_USE_SYSTEM_CFITSIO, ASTROPY_USE_SYSTEM_ERFA, ASTROPY_USE_SYSTEM_EXPAT, ASTROPY_USE_SYSTEM_WCSLIB, and ASTROPY_USE_SYSTEM_ALL. These should be set to 1 to build against the system libraries. [#9730]

    • ⚑️ The infrastructure of the package has been updated in line with the APE 17 roadmap (https://github.com/astropy/astropy-APEs/blob/master/APE17.rst). The main changes are that the python setup.py test and python setup.py build_docs commands will no longer work. The easiest way to replicate these commands is to install the tox (https://tox.readthedocs.io) package and run tox -e test and tox -e build_docs. It is also possible to run pytest and sphinx directly. Other significant changes include switching to setuptools_scm to manage the version number, and adding a pyproject.toml to opt in to isolated builds as described in PEP 517/518. [#9726]

    • ⚑️ Bundled expat is updated to version 2.2.9. [#10038]

    • Increase minimum asdf version to 2.6.0. [#10189]

    • ⚑️ The bundled version of PLY was updated to 3.11. [#10258]

    • βœ‚ Removed dependency on scikit-image. [#10214]

  • v4.1.dev

    November 29, 2019
  • v4.0.5 Changes

    March 26, 2021

    πŸ› Bug Fixes

    astropy.io.fits ^

    • πŸ›  Fix bug where manual fixes to invalid header cards were not preserved when saving a FITS file. [#11108]

    • πŸ›  Fix parsing of RVKC header card patterns that were not recognised where multiple spaces were separating field-specifier and value like "DP1.AXIS.1: 1". [#11301]

    • πŸ›  Fix misleading missing END card error when extra data are found at the end of the file. [#11285]

    • πŸ›  Fix incorrect wrapping of long card values as CONTINUE cards when some words in the value are longer than a single card. [#11304]

    astropy.io.misc ^

    • πŸ›  Fixed problem when writing serialized metadata to HDF5 using h5py >= 3.0. With the newer h5py this was writing the metadata table as a variable-length string array instead of the previous fixed-length bytes array. Fixed astropy to force using a fixed-length bytes array. [#11359]

    astropy.modeling ^

    • πŸ”„ Change Voigt1D function to use Humlicek's approximation to avoid serious inaccuracies + option to use (compiled) scipy.special.wofz error function for yet more accurate results. [#11177]

    astropy.table ^

    • πŸ›  Fixed bug when initializing a Table with a column as list of Quantity, for example Table({'x': [1*u.m, 2*u.m]}). Previously this resulted in an object dtype with no column unit set, but now gives a float array with the correct unit. [#11329]

    • πŸ›  Fixed byteorder conversion in to_pandas(), which had incorrectly triggered swapping when native endianness was stored with explicit dtype code '<' (or '>') instead of '='. [#11288, #11294]

    • πŸ›  Fixed a compatibility issue with numpy 1.21. Initializing a Table with a column like ['str', np.ma.masked] was failing in tests due to a change in numpy. [#11364]

    • πŸ›  Fixed bug when validating the inputs to table.hstack, table.vstack, and table.dstack. Previously, mistakenly calling table.hstack(t1, t2) (instead of table.hstack([t1, t2])) would return t1 instead of raising an exception. [#11336]

    • πŸ›  Fixed byteorder conversion in to_pandas(), which had incorrectly triggered swapping when native endianness was stored with explicit dtype code '<' (or '>') instead of '='. [#11288]

    astropy.time ^

    • πŸ›  Fix leap second update when using a non english locale. [#11062]

    • πŸ›  Fix default assumed location to be the geocenter when transforming times to and from solar-system barycenter scales. [#11134]

    • πŸ›  Fix inability to write masked times with formatted_value. [#11195]

    astropy.units ^

    • Ensure keepdims works for taking mean, std, and var of Quantity. [#11198]

    • For Quantity.to_string(), ensure that the precision argument is also used when the format is not latex. [#11145]

    astropy.wcs ^

    • πŸ‘ Allow "un-setting" of auxiliary WCS parameters in the aux attribute of Wcsprm. [#11166]
  • v4.0.4 Changes

    November 24, 2020

    πŸ› Bug Fixes

    astropy.coordinates

    • The norm() method for RadialDifferential no longer requires base to be specified. The norm() method for other non-Cartesian differential classes now gives a clearer error message if base is not specified. [#10969]

    • The transformations between ICRS and any of the heliocentric ecliptic frames (HeliocentricMeanEcliptic, HeliocentricTrueEcliptic, and HeliocentricEclipticIAU76) now correctly account for the small motion of the Sun when transforming a coordinate with velocity information. [#10970]

    astropy.io.ascii ^

    • 🐎 Partially fixed a performance issue when reading in parallel mode. Parallel reading currently has substantially worse performance than the default serial reading, so we now ignore the parallel option and fall back to serial reading. [#10880]

    • πŸ›  Fixed a bug where "" (blank string) as input data for a boolean type column was causing an exception instead of indicating a masked value. As a consequence of the fix, the values "0" and "1" are now also allowed as valid inputs for boolean type columns. These new allowed values apply for both ECSV and for basic character-delimited data files ('basic' format with appropriate converters specified). [#10995]

    astropy.modeling ^

    • πŸ›  Fixed use of weights with LinearLSQFitter. [#10687]

    astropy.stats ^

    • πŸ›  Fixed an issue in biweight stats when MAD=0 to give the same output with and without an input axis. [#10912]

    astropy.time ^

    • πŸ›  Fix a problem with the plot_date format for matplotlib >= 3.3 caused by a change in the matplotlib plot date default reference epoch in that release. [#10876]

    • πŸ‘Œ Improve initialization time by a factor of four when creating a scalar Time object in a format like unix or cxcsec (time delta from a reference epoch time). [#10406]

    astropy.visualization

    • πŸ›  Fixed the caclulation of the tight bounding box of a WCSAxes. This should also significantly improve the application of tight_layout() to figures containing WCSAxes. [#10797]
  • v4.0.3 Changes

    October 14, 2020

    πŸ› Bug Fixes

    astropy.table ^

    • πŸ›  Fixed a small bug where initializing an empty Column with a structured dtype with a length and a shape failed to give the requested dtype. [#10819]

    Other Changes and Additions

    • πŸ›  Fixed installation of the source distribution with pip<19. [#10837, #10852]