[AstroPy] ANN: sbpy 0.3 released

[Michael S. P. Kelley]

Dear all,

The sbpy project is pleased to announce a new release of sbpy: v0.3.
sbpy is an astropy affiliated package for small body (comet and
asteroid) research.  Notable highlights:

  * New VectorialModel to implement the Festou (1981) cometary gas
coma model of the same name.  Help is needed to test and validate this
code.
https://sbpy.readthedocs.io/en/latest/sbpy/activity/gas.html#vectorial-model

  * New ability to redden a solar spectrum.
https://sbpy.readthedocs.io/en/latest/sbpy/spectroscopy/index.html#spectral-reddening

  * DataClass fields (for ephemerides, orbits, etc) are now checked
for physically consistent units.

  * Many bug fixes and other enhancements, including a package
infrastructure overhaul to use contemporary standards.  Tracking
astropy development, astropy v4+ is required.

sbpy is available at GitHub
(https://github.com/NASA-Planetary-Science/sbpy/) and PyPI.
Install/upgrade with `pip install -U sbpy`.

The sbpy project is funded by NASA through the Planetary Data
Archiving, Restoration, and Tools grant program.  Funding for the sbpy
project will continue through 2024, culminating with the release of
v1.0.

Cheers,
Mike Kelley for the sbpy developers