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15 Eunomia

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15 Eunomia
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer Annibale de Gasparis
Discovery date July 29, 1851
Alternate
designations
  B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Main belt, Eunomia family
Orbital elements C (http://asteroid.lowell.edu/)
Epoch October 22, 2004 (JD 2453300.5)
Eccentricity (e) 0.186
Semi-major axis (a) 395.872 Gm (2.646 AU)
Perihelion (q) 322.290 Gm (2.154 AU)
Aphelion (Q) 469.453 Gm (3.138 AU)
Orbital period (P) 1572.323 d (4.30 a)
Mean orbital speed 18.15 km/s
Inclination (i) 11.732
Longitude of the
ascending node
(Ω)
293.399
Argument of
perihelion
(ω)
97.577
Mean anomaly (M) 148.829
Physical characteristics
Dimensions 255.3 km
Mass 8.41018 kg
Density 0.96 g/cm 1 (http://www.psi.edu/pds/archive/density.html)
Surface gravity 0.0343 m/s
Escape velocity 0.0935 km/s
Rotation period 0.2535 d (6.083 h) 2 (http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm)
Spectral class S-type asteroid
Absolute magnitude 5.28
Albedo 0.209 3 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html)
Mean surface
temperature
~168 K

15 Eunomia (ew-noh'-mee-a) is the 12th largest Main belt asteroid. It is also the largest member of the Eunomia family of asteroids. Like other true members of the family, it is composed of silicates and nickel-iron. It is light in colour.

It was discovered by A. de Gasparis on July 29, 1851 and named after Eunomia, one of the Horae (Hours), a personification of order and law in Greek mythology.

Eunomia has rather variable lightcurve indicating an elongated object. This led to a suggestion that Eunomia may be a binary object. However, it was refuted later. [1] (http://www.johnstonsarchive.net/astro/asteroidmoonsq.html)

Eunomia has been observed occulting stars three times.

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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.)
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