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22 Kalliope

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22 Kalliope
Orbital characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html)
Orbit type Main belt
Semimajor axis 2.908 AU
Perihelion distance 2.608 AU
Aphelion distance 3.207 AU
Orbital period 4.96 years
Inclination 13.71°
Eccentricity 0.103
Physical characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html)
Diameter 181 km
Mass 4 (http://www.sciencemag.org/cgi/content/abstract/300/5627/1939) 7.36 × 1018 kg
Density 4 (http://www.sciencemag.org/cgi/content/abstract/300/5627/1939) 2.37 g/cm³
Rotation period 3 (http://www.psi.edu/pds/archive/lc.html) 4.148 hours
Spectral class M
Abs. magnitude 6.45
Albedo 5 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html) 0.142
History 2 (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer J. R. Hind, 1852
Satellites
Name Linus

22 Kalliope (ka-lye'-a-pee) is a very large main belt asteroid discovered by J. R. Hind on November 16, 1852. It is named after Calliope, the Greek Muse of epic poetry.

Kalliope is 181 km in diameter, and is a M-type asteroid, indicating fairly pure nickel-iron composition. However, recent measurements show that 22 Kalliope's density is only 2.37 g/cm³, so it must contain considerable amount of other materials. Observations from the European Southern Observatory indicate that the asteroid is slightly elongated in shape. [1] (http://astron.berkeley.edu/~fmarchis/Science/Asteroids/Kalliope.html)

In 2001, two independant groups of astronomers, one at the Keck telescope and the other at Canada-France-Hawaii telescope, simultaneously discovered a small Kalliopean moon. It has been named Linus after the mythological figure. Linus is about 38 km in diameter and orbits about 1,000 km from Kalliope. It may be impact ejecta from a collision with Kalliope or a fragment captured after disruption of a parent asteroid (a proto-Kalliope).

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The minor planets
Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans
Centaurs | Trans-Neptunians | Damocloids | Comets | Kuiper belt | Oort cloud
(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.)
de:Kalliope (Asteroid)

es:(22) Caliope fr:22 Kalliope

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