Koronis family

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]

Compilation of CGI Koronis family asteroids from NASA, see Spins on Koronis asteroids

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
AsteroidMedian
diameter		Semi-major axisOrbital
inclination		Orbital
eccentricity		DiscoveredRefs
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
  1. 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.
  2. "Fresh Spin on Solar Powered Asteroids", Space.com, 10 September 2003
  3. Molnar, Lawrence A.; Haegert, M. J. (September 2009). "Details of Recent Collisions of Asteroids 832 Karin and 158 Koronis". American Astronomical Society: 27.05. Bibcode:2009DPS....41.2705M.
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