Backtracks

What's Changed
* Updated Actions workflow by tomasstolker in https://github.com/wbalmer/backtracks/pull/46
* Wordy tutorial that includes pure stationary case before running fit. by wbalmer in https://github.com/wbalmer/backtracks/pull/48
* Explicitly set reference epoch, save chi2 to object, and fixes plotting for stationary tracks by wbalmer in https://github.com/wbalmer/backtracks/pull/47
* Updated docstrings + bugfix pol2car by gotten in https://github.com/wbalmer/backtracks/pull/50


**Full Changelog**: https://github.com/wbalmer/backtracks/compare/v0.3.4...v0.4.0

What's Changed
* Fixed time scale of the Julian Dates (Terrestrial Time for calls to app_star) - Closes 29 by gotten in https://github.com/wbalmer/backtracks/pull/33
* Introduce host star priors, based on 5D+RV Gaia statistics (incl. covariance) by gotten in https://github.com/wbalmer/backtracks/pull/37
* Split host RV prior and allow RV prior override. by gotten in https://github.com/wbalmer/backtracks/pull/43

**Full Changelog**: https://github.com/wbalmer/backtracks/compare/v0.3.3...v0.3.4

:star: v0.3.3 now on pypi 💫

What's Changed
* Sphinx documentation by tomasstolker in https://github.com/wbalmer/backtracks/pull/28
* Added the gaia_release and gaia_epoch attributes by tomasstolker in https://github.com/wbalmer/backtracks/pull/34
* Cleanup by wbalmer in https://github.com/wbalmer/backtracks/pull/36


**Full Changelog**: https://github.com/wbalmer/backtracks/compare/v0.3.2...v0.3.3

tomasstolker saves us yet again. Major clarifications and improvements to the package structure (no more binary files, for instance). Fixed a big bug where data with covariance between terms was not included in the likelihood function (this was defeating the purpose of including all our excellent GRAVITY data!) and a few more knobs and user options (like setting sampling style within dynesty - if your sampler is running slowly, try changing the `sample_method` keyword from `'unif'` to `'rwalk'` or `'rslice'` in `system.fit` !)

A quick hot-fix to ensure that installing directly from pypi, e.g.


pip install backtracks


includes the data files needed to run. Now, no need to clone the repo! Just run


conda create python=3.9 -n backtrack
conda activate backtrack
conda install pip
pip install backtracks


download our example data and script (or make your own), and run


wget https://raw.githubusercontent.com/wbalmer/backtrack/main/tests/scorpions1b_orbitizelike.csv
wget https://raw.githubusercontent.com/wbalmer/backtrack/main/tests/hd131339a.py
python hd131339a.py