Dear colleagues, We are very happy to announce the v3.0 release of the Astropy package, a core Python package for Astronomy: http://www.astropy.org Astropy is a community-driven Python package intended to contain much of the core functionality and common tools needed for astronomy and astrophysics. It is part of the Astropy Project, which aims to foster an ecosystem of interoperable astronomy packages for Python. New and improved major functionality in this release includes: * Full support for velocities in the coordinates subpackage, including SkyCoord objects and proper motion corrections. * Very large ASCII files can now be read in as chunks, allowing larger tables to be efficiently read in, along with other performance improvements reading tables. * Time objects can now be read from or written to FITS files following the official FITS time standard. * Table mixin columns (e.g., quantities) can now be losslessly saved to HDF5 or FITS tables. * Constants can now be versioned using context managers. * Support for quantities in scipy special functions * A new command line script, "showtable", is available to display tables from any format Astropy can read. * The pytest plugins for testing Astropy have been moved to external packages, enabling their use in a wider range of Python packages. * False alarm probabilities are now available for the Lomb-Scargle periodogram implementation. In addition, hundreds of smaller improvements and fixes have been made. An overview of the changes is provided at: http://docs.astropy.org/en/stable/whatsnew/3.0.html Note that the Astropy 3.x series is the first to only support Python 3. Python 2 users can continue to use the 2.x series, which will receive bug fixes and support until the Python developers permanently sunset Python 2.7 (scheduled for 2019). Instructions for installing Astropy are provided on our website, and extensive documentation can be found at: http://docs.astropy.org If you make use of the Anaconda Python Distribution, you can update to Astropy v3.0 with: conda update astropy Whereas if you usually use pip, you can do: pip install astropy --upgrade Please report any issues, or request new features via our GitHub repository: https://github.com/astropy/astropy/issues Over 253 developers have contributed code to Astropy so far, and you can find out more about the team behind Astropy here: http://www.astropy.org/team.html As a reminder, Astropy v2.0 (our long term support release) will continue to be supported with bug fixes until the end 2019, so if you need to use Astropy in a very stable environment, you may want to consider staying on the v2.0.x set of releases (for which we have recently released v2.0.4). If you use Astropy directly for your work, or as a dependency to another package, please remember to include the following acknowledgment at the end of papers: "This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration, 2018)." where (Astropy Collaboration, 2018) is a citation to the Astropy Paper II: https://arxiv.org/abs/1801.02634 This paper is still under review, however, and an earlier paper is available describing the status of the package at the time of v0.2. If your work has used Astropy since then, you are encouraged to acknowledge both papers: This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration, 2013, 2018). where (Astropy Collaboration, 2013) is a citation to the first Astropy Paper: http://dx.doi.org/10.1051/0004-6361/201322068 Please feel free to forward this announcement to anyone you think might be interested in this release! The announcement can also be found online at http://www.astropy.org/announcements/release-3.0.html. Special thanks to the coordinator for this release: Brigitta Sipocz. Erik Tollerud, Tom Robitaille, Kelle Cruz, and Tom Aldcroft on behalf of The Astropy Collaboration