Ground-based astrometry calibrated by Gaia DR1: new perspectives in asteroid orbit determination
Data Release 1 (GDR1) is a first, important step on the path of evolution of astrometric accuracy towards a much improved situation. Although asteroids are not present in GDR1, this intermediate release already impacts asteroid astrometry.<i>Aims. <i/>Our goal is to investigate how the G...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
31 October 2017
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| In: |
Astronomy and astrophysics
Year: 2017, Jahrgang: 607 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201731439 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1051/0004-6361/201731439 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2017/11/aa31439-17/aa31439-17.html 
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| Verfasserangaben: | F. Spoto, P. Tanga, S. Bouquillon, J. Desmars, D. Hestroffer, F. Mignard, M. Altmann, D. Herald, J. Marchant, C. Barache, T. Carlucci, T. Lister, and F. Taris |
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| 245 | 1 | 0 | |a Ground-based astrometry calibrated by Gaia DR1 |b new perspectives in asteroid orbit determination |c F. Spoto, P. Tanga, S. Bouquillon, J. Desmars, D. Hestroffer, F. Mignard, M. Altmann, D. Herald, J. Marchant, C. Barache, T. Carlucci, T. Lister, and F. Taris |
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| 520 | |a Data Release 1 (GDR1) is a first, important step on the path of evolution of astrometric accuracy towards a much improved situation. Although asteroids are not present in GDR1, this intermediate release already impacts asteroid astrometry.<i>Aims. <i/>Our goal is to investigate how the GDR1 can change the approach to a few typical problems, including the determination of orbits from short-arc astrometry, the exploitation of stellar occultations, and the impact risk assessment.<i>Methods. <i/>We employ optimised asteroid orbit determination tools, and study the resulting orbit accuracy and post-fit residuals. For this goal, we use selected ground-based asteroid astrometry, and occultation events observed in the past. All measurements are calibrated by using GDR1 stars.<i>Results. <i/>We show that, by adopting GDR1, very short measurement arcs can already provide interesting orbital solutions, capable of correctly identifying near-Earth asteroids (NEAs) and providing a much more accurate risk rating. We also demonstrate that occultations, previously used to derive asteroid size and shapes, now reach a new level of accuracy at which they can be fruitfully used to obtain astrometry at the level of accuracy of <i>Gaia <i/>star positions. | ||
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