Volumes And Bulk Densities Of Forty Asteroids From ADAM Shape Modeling Asteroids Shape

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April 12, 2020

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(Submitted on 7 Feb 2017)

Abstract: Disk-integrated photometric data about asteroids do not contain accurate information on appearance details or extent scale. Additional data such as disk-resolved images or stellar occultation measurements further constrain asteroid shapes and allow extent estimates. We aim to use all available disk-resolved images about about forty asteroids obtained by the Near-InfraRed Camera (Nirc2) mounted on the W.M. Keck II telescope together with the disk-integrated photometry and stellar occultation measurements to determine their volumes. We can then use the volume, in combination with the known mass, to derive the bulk density. We download and process all minor planet disk-resolved images obtained by the Nirc2 that are available in the Keck Observatory Archive (KOA). We combine optical disk-integrated data and stellar occultation profiles with the disk-resolved images and use the All-Data Asteroid Modeling (ADAM) algorithm for the appearance and extent modeling. Our approach provides constraints on the expected uncertainty in the quantity and extent as well. We present shape models and quantity for 41 asteroids. For 35 asteroids, the sense about their mass estimates from the letters allowed us to derive their bulk densities. We clearly see a trend about lower bulk densities for primitive objects (C-complex) than for S-complex asteroids. The range about densities in the X-complex is large, suggesting various compositions. Moreover, we identified a few objects with rather peculiar bulk densities, which is likely a hint of their poor lot estimates. Asteroid masses determined from the Gaia astrometric observations should further refine most about the density estimates.

Submission history

From: Josef Hanuš []

[v1] Tue, 7 Feb 2017 13:15:16 UTC (2,205 KB)