asteroid belt
The asteroid belt is a torus-shaped region in the Solar System, centered on the Sun and roughly spanning the space between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies called asteroids ...
, approximately in diameter. It was discovered on 26 May 1932, by South African astronomer Cyril Jackson at the
Union Observatory
Union Observatory, also known as Transvaal Observatory, Republic Observatory and Johannesburg Observatory ( 078), is a defunct astronomical observatory in Johannesburg, South Africa that operated from 1903 to 1971. It is located on Observatory R ...
in Johannesburg. The
S-type asteroid
S-type (stony-type or silicaceous-type) asteroids are asteroids with a spectral type that is indicative of a siliceous (i.e. stony) mineralogical composition, hence the name. They have relatively high density. Approximately 17% of asteroids are ...
is likely elongated and has a
rotation period
In astronomy, the rotation period or spin period of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the '' sidereal rotation period'' (or ''sidereal day''), i.e., the time that the objec ...
of 4.9 hours. It was named for the city of
Calvinia
Calvinia is a regional town in the Northern Cape province of South Africa named after the French people, French religious reformer Jean Calvin. The town falls under the Hantam Local Municipality which forms part of the Namakwa District Municipalit ...
Knežević Knežević () is a Serbian, Croatian, Montenegrin and Bosnian surname, derived from the title of '' knez''. It may refer to:
* House of Knežević, Croatian noble family
Knežević is the eighth most frequent surname in Croatia.
The angliciz ...
, ''Calvinia'' is a member of the
Koronis family
]
The Koronis or Koronian family (), also known as the Lacrimosa family, is a very large asteroid family of S-type asteroid, stony asteroids, located in the Kirkwood gap, outer region of the asteroid belt. They are thought to have been formed at l ...
(), a very large outer
asteroid family
An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions. An ...
with nearly co-planar ecliptical orbits. Interestingly, in one of the most recent and complete synthetic HCM-analysis by Nesvorný, ''Calvinia'' is not a Koronian asteroid but belongs to the background population.
It orbits the Sun in the
Raoul Behrend
This is a list of minor-planet discoverers credited by the Minor Planet Center with the discovery of one or several minor planets (such as near-Earth and main-belt asteroids, Jupiter trojans and distant objects). , the discovery of 612,011 nu ...