The Koronis or Koronian family ( FIN: 605), also known as the Lacrimosa family, [1]: 16 is a very large asteroid family of stony asteroids, located in the outer region of the asteroid belt. They are thought to have been formed at least two billion years ago in a catastrophic collision between two larger bodies. The family is named after 158 Koronis, and the largest known member ( 208 Lacrimosa) is about 41 km (25 mi) in diameter. The Koronis family travels in a cluster along the same orbit. [2] It has 5949 members. [1]
This family has two subfamilies. The Karin family (FIN: 610) was formed remarkably recently in a catastrophic collision (destroying the parent body), with an estimated age of 5.72 million years. The Koronis(2) family (FIN: 621) with 246 members is the other. [1] It formed 15 million years ago by a non-catastrophic collision with 158 Koronis. [3]
On August 28, 1993, the Galileo spacecraft visited a member of this family, 243 Ida. A photo of Ida (and its tiny moon Dactyl) is part of the composite image at right (numbered 243).
Large members
| Asteroid | Median diameter |
Semi-major axis |
Orbital inclination |
Orbital eccentricity |
Discovered | Refs | |
|---|---|---|---|---|---|---|---|
| 158 | Koronis | 35.4 km | 2.867 AU | 1.00° | 0.057 | 1876 | JPL · MPC |
| 167 | Urda | 39.9 km | 2.855 AU | 2.21° | 0.035 | 1876 | JPL · MPC |
| 208 | Lacrimosa | 41.0 km | 2.895 AU | 1.751° | 0.015 | 1879 | JPL · MPC |
| 243 | Ida | 31.3 km | 2.861 AU | 1.138° | 0.046 | 1884 | JPL · MPC |
| 263 | Dresda | 23.0 km | 2.886 AU | 1.314° | 0.079 | 1886 | JPL · MPC |
| 277 | Elvira | 27.0 km | 2.887 AU | 1.156° | 0.089 | 1888 | JPL · MPC |
| 311 | Claudia | 24.0 km | 2.897 AU | 3.225° | 0.008 | 1891 | JPL · MPC |
| 321 | Florentina | 27.0 km | 2.886 AU | 2.594° | 0.043 | 1891 | JPL · MPC |
| 534 | Nassovia | 32.3 km | 2.884 AU | 3.277° | 0.057 | 1904 | JPL · MPC |
| 720 | Bohlinia | 33.7 km | 2.888 AU | 2.359° | 0.014 | 1911 | JPL · MPC |
| 1223 | Neckar | 22.8 km | 2.869 AU | 2.55052º | 0.061 | 1931 | JPL · MPC |
| 9908 | Aue | n.a. | 2.900 AU | 2.68° | 0.036 | 1971 | JPL · MPC |
References
- ^ a b c Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv: 1502.01628. Bibcode: 2015aste.book..297N. doi: 10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
- ^ " Fresh Spin on Solar Powered Asteroids", Space.com, 10 September 2003
- ^ Molnar, Lawrence A.; Haegert, M. J. (September 2009). "Details of Recent Collisions of Asteroids 832 Karin and 158 Koronis". American Astronomical Society. 41: 27.05. Bibcode: 2009DPS....41.2705M.