Precise astrometry and diameters of asteroids from occultations -- a data-set of observations and their interpretation
| Autor: | Herald, David, Gault, David, Anderson, Robert, Dunham, David, Frappa, Eric, Hayamizu, Tsutomu, Kerr, Steve, Miyashita, Kazuhisa, Moore, John, Pavlov, Hristo, Preston, Steve, Talbot, John, Timerson, Brad |
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| Rok vydání: | 2020 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/staa3077 |
| Popis: | Occultations of stars by asteroids have been observed since 1961, increasing from a very small number to now over 500 annually. We have created and regularly maintain a growing data-set of more than 5,000 observed asteroidal occultations. The data-set includes: the raw observations; astrometry at the 1 mas level based on centre of mass or figure (not illumination); where possible the asteroid's diameter to 5 km or better, and fits to shape models; the separation and diameters of asteroidal satellites; and double star discoveries with typical separations being in the tens of mas or less. The data-set is published at NASA's Planetary Data System and is regularly updated. We provide here an overview of the data-set, discuss the issues associated with determining the astrometry and diameters, and give examples of what can be derived from the data-set. We also compare the occultation diameters of asteroids with the diameters measured by the satellites NEOWISE, AKARI AcuA, and IRAS, and show that the best satellite-determined diameter is a combination of the diameters from all three satellites. Comment: As accepted, MNRAS |
| Databáze: | arXiv |
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