v0.5.0

Revised required and optional packages:

• Only numpy and astropy are required; scipy, synphot, ads, and astroquery are
  now optional dependencies. [#383]

• Created an option to install a recommended list of packages, e.g., pip install sbpy[recommended]. [#383]

• Require astropy >= 5.3.3 to avoid a security vulnerability. [#400]

New Features

sbpy.activity

• New sbpy.activity.CircularAperture.from_coma_equivalent() to immediately
  create a CircularAperture from any other Aperture given a nominal coma
  surface brightness distribution. [#393]

sbpy.dynamics

• New class to encapsulate dynamical state vectors: sbpy.dynamics.state.State. [#394]

• New support for dynamical integrations: sbpy.dynamics.models. Three models
  are implemented: FreeExpansion, SolarGravity, and SolarGravityAndRadiationPressure. [#394]

• New ability to produce dust syndynes and synchrones: sbpy.dynamics.syndynes. [#394]

sbpy.time

• New sub-module to support conversions to NAIF SPICE ephemeris time. [#394]

API Changes

sbpy.sources

• Deprecated SynphotRequired. Use
  sbpy.execptions.RequiredPackageUnavailable. [#383]

Bug Fixes

• sbpy.sources.SpectralSource now correctly raises
  RequiredPackageUnavailable when synphot is not available, replacing a
  locally defined SynphotRequired or the generic ImportError. [#383]

• Fix sbpy.photometry.bandpass crash when reading in SDSS filter transmission
  curves using synphot 1.4. [#400]

• Fixed missing CALSPEC solar spectrum from sbpy.calib.solar_sources. [#387]

Developer notes

sbpy.utils

• New required_packages and optional_packages functions to test for the
  presence of required and optional packages. [#383]

sbpy.utils.decorators

• New requires and optionally_uses function decorators to simplify testing
  for required and optional packages. [#383]