The Themis family (adj. Themistian; FIN: 602) is a family of carbonaceous asteroids located in the outer portion of the asteroid belt, at a mean distance of 3.13 AU from the Sun. It is one of the largest families with over 4700 known members, and consists of a well-defined core of larger bodies surrounded by a region of smaller ones. The collisional Themis family is named after its parent body, the asteroid 24 Themis, discovered on 5 April 1853 by Italian astronomer Annibale de Gasparis.
Description
The Themis family is one of the largest and longest-recognized dynamical families of asteroids, and is made up of C-type asteroids with a composition believed to be similar to that of carbonaceous chondrites. To date, the Themis family comprises approximately 535 known asteroids.
Asteroids in the Themis family share the following orbital elements:
- semimajor axes between 3.08 AU and 3.24 AU
- orbital eccentricities between 0.09 and 0.22
- orbital inclinations of less than 3°
List
Some of the largest members of this family include:
See also
- Hirayama family
References
- Castillo-Rogez, C. & Schmidt, B. E. (2010). "Geophysical Evolution of the Themis Family Parent Body" (PDF).
{{cite journal}}: Cite journal requires|journal=(help)
External links
- Nesvorny HCM Asteroid Families V3.0, Small Bodies Data Ferret
