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David Hobbs. Photo.

David Hobbs

Professor

David Hobbs. Photo.

Improving distance estimates to nearby bright stars: Combining astrometric data from Hipparcos, Nano-JASMINE and Gaia

Author

  • Daniel Michalik
  • Lennart Lindegren
  • David Hobbs
  • Uwe Lammers
  • Yoshiyuki Yamada

Summary, in English

Starting in 2013, Gaia will deliver highly accurate astrometric data, which eventually will supersede most other stellar catalogues in accuracy and completeness. It is, however, limited to observations from magnitude 6 to 20 and will therefore not include the brightest stars. Nano-JASMINE, an ultrasmall Japanese astrometry satellite, will observe these bright stars, but with much lower accuracy. Hence, the Hipparcos catalogue from 1997 will likely remain the main source of accurate distances to bright nearby stars. We are investigating how this might be improved by optimally combining data from all three missions through a joint astrometric solution. This would take advantage of the unique features of each mission: the historic bright-star measurements of Hipparcos, the updated bright-star observations of Nano-JASMINE, and the very accurate reference frame of Gaia. The long temporal baseline between the missions provides additional benefits for the determination of proper motions and binary detection, which indirectly improve the parallax determination further. We present a quantitative analysis of the expected gains based on simulated data for all three missions.

Department/s

  • Lund Observatory - Has been reorganised

Publishing year

2013

Language

English

Pages

414-417

Publication/Series

Advancing the Physics of Cosmic Distances, Proceedings of the International Astronomical Union, IAU Symposium, Volume 289, pp. 414-417

Volume

289

Document type

Conference paper

Publisher

International Astronomical Union

Topic

  • Physical Sciences
  • Astronomy, Astrophysics and Cosmology

Keywords

  • astrometry
  • catalogs
  • methods: data analysis
  • methods: statistical
  • reference systems

Conference name

International Astronomical Union, Symposium 289: Advancing the Physics of Cosmic Distances

Conference date

0001-01-02

Status

Published