Koronis family

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

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[edit]

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[edit]

  1. ^ a b c Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 23 June 2017.
  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. Bibcode:2009DPS....41.2705M. Retrieved 7 November 2018.

External links[edit]