Orbitize! A Comprehensive Orbit-fitting Software Package for the High-contrast Imaging Community

Sarah Blunt, Jason J. Wang, Isabel Angelo, Henry Ngo, Devin Cody, Devin Cody, Robert J. De Rosa, James R. Graham, Lea Hirsch, Vighnesh Nagpal, Eric L. Nielsen, Logan Pearce, Malena Rice, Roberto Tejada, Roberto Tejada

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


orbitize! is an open-source, object-oriented software package for fitting the orbits of directly imaged objects. It packages the Orbits for the Impatient (OFTI) algorithm and a parallel-tempered Markov Chain Monte Carlo (MCMC) algorithm into a consistent and intuitive Python API. orbitize! makes it easy to run standard astrometric orbit fits; in less than 10 lines of code, users can read in data, perform one fit using OFTI and another using MCMC, and make two publication-ready figures. Extensive pedagogical tutorials, intended to be navigable by both orbit-fitting novices and seasoned experts, are available on our documentation page. We have designed the orbitize! API to be flexible and easy to use/modify for unique cases. orbitize! was designed by members of the exoplanet imaging community to be a central repository for algorithms, techniques, and know-how developed by this community. We intend for it to continue to expand and change as the field progresses and new techniques are developed, and call for community involvement in this process. Complete and up-to-date documentation is available at orbitize.info, and the source code is available at github.com/sblunt/orbitize.

Original languageEnglish (US)
Article number89
JournalAstronomical Journal
Issue number3
StatePublished - Mar 2020

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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