Rotation periods and shape asphericity in asteroid families based on TESS S1-S13 observations

Szabó M., Gyula and Pál, András and Szigeti, László and Sódorné Bognár, Zsófia and Bódi, Attila and Kalup, Csilla and Jäger, Zoltán and Kiss, L. László and Kiss, Csaba and Kovács, József and Marton, Gábor and Molnár, László and Plachy, Emese and Sárneczky, Krisztián and Szakáts, Róbert and Szabó, Róbert (2022) Rotation periods and shape asphericity in asteroid families based on TESS S1-S13 observations. ASTRONOMY & ASTROPHYSICS, 661. ISSN 0004-6361

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Abstract

Here we present the analysis of the distribution of rotation periods and light curve amplitudes based on 2859 family asteroids in 16 Main Belt families based on 9912 TESS asteroid light curves in the TSSYS-DR1 asteroid light curve database. We found that the distribution of the light curve properties follow a family-specific character in some asteroid families, including the Hungaria, Maria, Juno, Eos, Eucharis, and Alauda families. While in other large families, these distributions are in general very similar to each other. We confirm that older families tend to contain a larger fraction of more spheroidal, low-amplitude asteroids. We found that rotation period distributions are different in the cores and outskirts of the Flora and Maria families, while the Vesta, Eos, and Eunomia families lack this feature. We also confirm that very fast spinning asteroids are close to spherical (or spinning top shapes), and minor planets rotating slower than approximate to 11 h are also more spherical than asteroids in the 4-8 h period range and this group is expected to contain the most elongated bodies.

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