45 Eugenia

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45 Eugenia
CFHT image of Eugenia and Petit-Prince
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CFHT image of Eugenia and Petit-Prince

Orbital characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html)
Orbit type Main belt
Semimajor axis 2.722 AU
Perihelion distance 2.496 AU
Aphelion distance 2.947 AU
Orbital period 4.49 years
Inclination 6.61°
Eccentricity 0.083
Physical characteristics
Diameter 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) 214.6 km
Mass 3 (http://charlie.psi.edu/pds/) 6.07 × 1018 kg
Density 3 (http://charlie.psi.edu/pds/) 1.2 g/cm³
Rotation period 3 (http://charlie.psi.edu/pds/) 5.699 hours
Spectral class F
Abs. magnitude 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) 7.46
Albedo 4 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html) 0.040
History 2 (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer H. Goldschmidt, 1857
Satellites
Name Petit-Prince

45 Eugenia (ew-jee'-nee-a) is a large Main belt asteroid. It is famed as one of the first asteroids to be found to have a moon orbiting it.

Eugenia was discovered in 1857 by Hermann Goldschmidt. It was named after Empress Eugenia di Montijo, the wife of Napoleon III, and was the first asteroid to be named after a real person, rather than a figure from classical legend (although there had been controversy about whether 12 Victoria was really named for the mythological figure or for Queen Victoria).

Eugenia is a large asteroid, with a diameter of 214 km. It is an F-type asteroid, which means that it is very dark in colouring (darker than soot) with a carbonaceous composition. Like Mathilde, its density appears to be unusually low, indicating that it may be a loosely-packed rubble pile, not a monolithic object.

In 1998, astronomers at the Canada-France-Hawaii Telescope on Mauna Kea, Hawaii, discovered a small moon orbiting Eugenia. This was the first time an asteroidal moon had been discovered by a ground-based telescope. Eugenia's moon has been named Petit-Prince, after Empress Eugenia's son, the Prince Imperial. The moon is much smaller than Eugenia, about 13 km in diameter, and takes five days to complete an orbit around it.

See Also

Dactyl and Ida - Another asteroid and asteroid moon system catalogued by astronomers

External links


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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:Eugenia (Asteroid)

es:(45) Eugenia

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