AKARI/AcuA physical studies of the cybele asteroid family

Toshihiro Kasuga, Fumihiko Usui, Sunao Hasegawa, Daisuke Kuroda, Takafumi Ootsubo, Thomas G. Müller, Masateru Ishiguro

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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 > 10km, 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 10km <D < 80km. Their cumulative power-law size distribution index shows a shallow value of 0.86 ± 0.03. By contrast, 29 large Cybeles with D > 80km 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 10 -5 M Earth. We also discuss the origin and formation process of the Cybele asteroid family.

Original languageEnglish
JournalAstronomical Journal
Issue number6
Publication statusPublished - 2012 Jun


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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