AKARI/AcuA PHYSICAL STUDIES OF THE CYBELE ASTEROID FAMILY

作者：Kasuga Toshihiro^*; Usui Fumihiko; Hasegawa Sunao; Kuroda Daisuke; Ootsubo Takafumi; Mueller Thomas G; Ishiguro Masateru

来源：Astronomical Journal, 2012, 143(6): 141.

DOI：10.1088/0004-6256/143/6/141

• infrared: planetary systems
• minor planets, asteroids: general

We present a study of 107 Cybele asteroids based on the archival database "Asteroid Catalog Using AKARI (AcuA)" taken by the Infrared Astronomical Satellite. The database provides diameters D > 10 km, geometric albedos, and taxonomic information (75%) of the Cybeles. We find taxonomic diversity (mainly C-, D-, and P-type) in the population of 78 small Cybeles with diameters 10 km < D < 80 km. Their cumulative power-law size distribution index shows a shallow value of 0.86 +/- 0.03. By contrast, 29 large Cybeles with D > 80 km are mostly classified as C- or P-types (90%), with a power-law index of 2.39 +/- 0.18. The total mass of Cybele asteroids is estimated to be similar to 10(-5) M-Earth. We also discuss the origin and formation process of the Cybele asteroid family.

• 出版日期2012-6
• 单位中国科学院国家天文台