15 Eunomia - Definition and Overview

**15 Eunomia**
Discovery
Discoverer	Annibale de Gasparis
Discovery Date	July 29, 1851
Alternate Designations
Category	Main belt, Eunomia family
Orbital Elements Epoch October 22, 2004 (JD 2453300.5)
Eccentricity (e)	0.186
Semi-Major Axis (a)	395.872 G m (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	8.4×10¹⁸ kg
Density	0.96 g/cm³ ^{1 (http://www.psi.edu/pds/archive/density.html)}
Surface Gravity	0.0343 m/s²
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	~228 K

15 Eunomia ("you KNOW 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

(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)

(For a complete listing, see: List of asteroids)

Example Usage of Eunomia
	ednaru2co: Eunomia » That Sound You Hear Is My Teeth Grinding http://tinyurl.com/yzn9d48
	fbardamu: Eunomia » A Sure Path To Self-Destruction http://bit.ly/5s5cA8

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15 Eunomia - Definition and Overview

Example Usage of Eunomia