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… Expand


Joint astrometric solution of HIPPARCOS and Gaia - A recipe for the Hundred Thousand Proper Motions project
HTPM will significantly improve the proper motions of the HIPPARCOS Catalogue well before highly accurate Gaiaonly results become available and will allow us to detect long period binary and exoplanetary candidates which would be impossible to detect from Gaia data alone. Expand
On the use of the Hipparcos intermediate astrometric data
With the publication of the Hipparcos cat- alogue, astrometric data of unprecedented quality and quantity has become available, providing parallaxes, po- sitions and proper motions free fromExpand
Gaia Data Release 2
Context. Gaia Data Release 2 (Gaia DR2) contains results for 1693 million sources in the magnitude range 3 to 21 based on observations collected by the European Space Agency Gaia satellite during theExpand
Gaia Data Release 2
The dramatic improvement brought by Gaia DR2 astrometry of SSOs is demonstrated by comparisons to the archive data and by preliminary tests on the detection of subtle non-gravitational effects. Expand
The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet β Pictoris b from Combined Direct Imaging and Astrometry
We present new observations of the planet beta Pictoris b from 2018 with GPI, the first GPI observations following conjunction. Based on these new measurements, we perform a joint orbit fit to theExpand
Analysis of the Hipparcos observations of the extrasolar planets and the brown-dwarf candidates
We analyzed the Hipparcos astrometric observations of 47 stars that were discovered to harbor giant planets and 14 stars with brown-dwarf secondary candidates. The Hipparcos measurements were usedExpand
The Hipparcos – Gaia Catalog of Accelerations
This paper presents a cross-calibrated catalog of Hipparcos and Gaia astrometry to enable their use in measuring changes in proper motion, i.e., accelerations in the plane of the sky. The finalExpand
A new method for target selection in direct imaging programmes with COPAINS
We present COPAINS (Code for Orbital Parametrization of Astrometrically Inferred New Systems), an innovative tool developed to identify previously undiscovered companions detectable via directExpand
Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project
(abridged) The Hundred-Thousand-Proper-Motion (HTPM) project will determine the proper motions of ~113500 stars using a 23-year baseline. The proper motions will use the Hipparcos data, with epochExpand
Gaia Early Data Release 3
Context. We present the early installment of the third Gaia data release, Gaia EDR3, consisting of astrometry and photometry for 1.8 billion sources brighter than magnitude 21, complemented with theExpand