Koronis family

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

The Koronis or Koronian family is a family of asteroids in the main belt between Mars and Jupiter. 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.[1] It has 5949 members.[2]

This family has two subfamilies. The Karin family 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 is the other, formed 15 million years ago by a non-catastrophic collision with 158 Koronis.[3] It has 246 members.[2]

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).

Some of the larger Koronis-family asteroids

Name Median
diameter		 Semi-major axis Orbital
inclination		 Orbital eccentricity  Discovered 
158 Koronis 35.4 km 2.867 AU 1.00° 0.057 1876
167 Urda 39.9 km 2.855 AU 2.21° 0.035 1876
208 Lacrimosa 41.0 km 2.895 AU 1.751° 0.015 1879
243 Ida 31.3 km 2.861 AU 1.138° 0.046 1884
263 Dresda 23.0 km 2.886 AU 1.314° 0.079 1886
277 Elvira 27.0 km 2.887 AU 1.156° 0.089 1888
311 Claudia 24.0 km 2.897 AU 3.225° 0.008 1891
321 Florentina 27.0 km 2.886 AU 2.594° 0.043 1891
534 Nassovia ? 2.884 AU 3.277° 0.057 1904
720 Bohlinia ? 2.888 AU 2.359° 0.014 1911
1223 Neckar ? 2.8690752 AU 2.55052º 0.0605204 1931
9908 Aue ? 2.900 AU 2.68° 0.0355 1971

See also

References

  1. ↑ "Fresh Spin on Solar Powered Asteroids", Space.com, 10 September 2003
  2. 1 2 Nesvorný, David; Brož, Miroslav; Carruba, Valerio (2015). "Identification and Dynamical Properties of Asteroid Families". In Michel, Patrick; DeMeo, Francesca E.; Bottke, William F. Asteroids IV. arXiv:1502.01628. ISBN 9780816532186.
  3. ↑ Molnar, Lawrence A.; Haegert, M. J. (September 2009), "Details of Recent Collisions of Asteroids 832 Karin and 158 Koronis", American Astronomical Society, DPS meeting #41, #27.05, Bibcode:2009DPS....41.2705M
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