htof: A New Open-source Tool for Analyzing Hipparcos, Gaia, and Future Astrometric Missions

  title={htof: A New Open-source Tool for Analyzing Hipparcos, Gaia, and Future Astrometric Missions},
  author={G. Mirek Brandt and Daniel Michalik and Timothy D. Brandt and Yiting Li and Trent J. Dupuy and Yunlin Zeng},
  journal={The Astronomical Journal},
We present htof, an open-source tool for interpreting and fitting the intermediate astrometric data (IAD) from both the 1997 and 2007 reductions of Hipparcos, the scanning law of Gaia, and future missions such as the Nancy Grace Roman Space Telescope (NGRST). htof solves the astrometric parameters of any system for any arbitrary combination of absolute astrometric missions. In preparation for later Gaia data releases, htof supports arbitrarily high-order astrometric solutions (e.g., five… 
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