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

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


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.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Sciences
  • Astronomy, Astrophysics and Cosmology


  • astrometry, catalogs, methods: data analysis, methods: statistical, reference systems
Original languageEnglish
Title of host publicationAdvancing the Physics of Cosmic Distances, Proceedings of the International Astronomical Union, IAU Symposium, Volume 289, pp. 414-417
PublisherInternational Astronomical Union
Number of pages4
Publication statusPublished - 2013
Publication categoryResearch
EventInternational Astronomical Union, Symposium 289: Advancing the Physics of Cosmic Distances -
Duration: 0001 Jan 2 → …

Publication series



ConferenceInternational Astronomical Union, Symposium 289: Advancing the Physics of Cosmic Distances
Period0001/01/02 → …