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Koronis family

Asteroid family

The Koronis or Koronian family (FIN: 605), also known as the Lacrimosa family, 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 in diameter. The Koronis family travels in a cluster along the same orbit. It has 5949 members.

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. It formed 15 million years ago by a non-catastrophic collision with 158 Koronis.

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](158-koronis)	35.4 km	2.867 AU	1.00°	0.057	1876
167	[Urda](167-urda)	39.9 km	2.855 AU	2.21°	0.035	1876
208	[Lacrimosa](208-lacrimosa)	41.0 km	2.895 AU	1.751°	0.015	1879
243	[Ida](243-ida)	31.3 km	2.861 AU	1.138°	0.046	1884
263	[Dresda](263-dresda)	23.0 km	2.886 AU	1.314°	0.079	1886
277	[Elvira](277-elvira)	27.0 km	2.887 AU	1.156°	0.089	1888
311	[Claudia](311-claudia)	24.0 km	2.897 AU	3.225°	0.008	1891
321	[Florentina](321-florentina)	27.0 km	2.886 AU	2.594°	0.043	1891
534	[Nassovia](534-nassovia)	32.3 km	2.884 AU	3.277°	0.057	1904
720	[Bohlinia](720-bohlinia)	33.7 km	2.888 AU	2.359°	0.014	1911
1223	[Neckar](1223-neckar)	22.8 km	2.869 AU	2.55052º	0.061	1931
9908	[Aue](9908-aue)	n.a.	2.900 AU	2.68°	0.036	1971

References

"[http://www.space.com/scienceastronomy/asteroid_spin_030910.html Fresh Spin on Solar Powered Asteroids]", Space.com, 10 September 2003

Info: Wikipedia Source

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