Combining and Comparing Astrometric Data from Different Epochs: A Case Study with Hipparcos and Nano-JASMINE

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceeding

Abstract

The Hipparcos mission (1989-1993) resulted in the first space-based stellar catalogue including measurements of positions, parallaxes and annual proper motions accurate to about one milli-arcsecond. More space astrometry missions will follow in the near future. The ultra-small Japanese mission Nano-JASMINE (launch in late 2013) will determine positions and annual proper motions with some milli-arcsecond accuracy. In mid 2013 the next-generation ESA mission Gala will deliver some tens of micro-arcsecond accurate astrometric parameters. Until the final Gala catalogue is published in early 2020 the best way of improving proper motion values is the combination of positions from different missions separated by long time intervals. Rather than comparing positions from separately reduced catalogues, we propose an optimal method to combine the information from the different data sets by making a joint astrometric solution. This allows to obtain good results even when each data set alone is insufficient for an accurate reduction. We demonstrate our method by combining Hipparcos and simulated Nano-JASMINE data in a joint solution. We show a significant improvement over the conventional catalogue combination.

Detaljer

Författare
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi
Originalspråkengelska
Titel på värdpublikationAstronomical Data Analysis Software and Systems XXI (ASP Conference Series)
FörlagAstronomical Society of the Pacific
Sidor549-552
Volym461
StatusPublished - 2012
PublikationskategoriForskning
Peer review utfördJa
Evenemang21st Annual Conference on Astronomical Data Analysis Software and Systems - Paris, Frankrike
Varaktighet: 2011 nov 62011 nov 10

Publikationsserier

Namn
Volym461

Konferens

Konferens21st Annual Conference on Astronomical Data Analysis Software and Systems
LandFrankrike
OrtParis
Period2011/11/062011/11/10