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README.md

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+# backtracks
+
+.. image:: https://img.shields.io/pypi/v/backtracks
+   :target: https://pypi.python.org/pypi/backtracks
+
+.. image:: https://github.com/wbalmer/backtracks/actions/workflows/main.yml/badge.svg
+   :target: https://github.com/wbalmer/backtracks/actions
+
+.. image:: https://img.shields.io/readthedocs/backtracks
+   :target: http://backtracks.readthedocs.io
+
+.. image:: https://img.shields.io/github/license/wbalmer/backtracks
+   :target: https://github.com/wbalmer/backtracks/blob/main/LICENSE
+
+:stars: Python package to fit relative astrometry with background star motion tracks.
+
+Written by Gilles Otten (@gotten), William Balmer (@wbalmer), and Tomas Stolker (@tomasstolker).
+
+eDR3 Distance prior summary file from this [source](https://arxiv.org/pdf/2012.05220.pdf), published in [Bailer-Jones+2021](https://arxiv.org/abs/2012.05220).
+
+Current example (HD131399Ab) uses data from Wagner+22 and Nielsen+17. Thank you to Kevin Wagner for providing the latest astrometry!
+
+Log-likelihood borrowed heavily from `orbitize!` (BSD 3-clause).