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Main-belt asteroid From Wikipedia, the free encyclopedia
30 Urania is a large main-belt asteroid that was discovered by English astronomer John Russell Hind on July 22, 1854.[1] It was his last asteroid discovery. This object is named after Urania, the Greek Muse of astronomy. Initial orbital elements for 30 Urania were published by Wilhelm Günther, an assistant at Breslau Observatory.[7] It is orbiting the Sun with a period of 3.64 years and is spinning on its axis once every 13.7 hours.
Discovery[1] | |
---|---|
Discovered by | J. R. Hind |
Discovery date | July 22, 1854 |
Designations | |
(30) Urania | |
Pronunciation | /jʊəˈreɪniə/ yoor-AY-nee-ə[2] |
Named after | Urania |
1948 JK | |
Main belt | |
Symbol | (astrological) |
Orbital characteristics[3] | |
Epoch June 14, 2006 (JD 2453900.5) | |
Aphelion | 398.817 Gm (2.666 AU) |
Perihelion | 309.338 Gm (2.068 AU) |
354.077 Gm (2.367 AU) | |
Eccentricity | 0.126 |
1,330.017 d (3.64 a) | |
196.549° | |
Inclination | 2.097° |
307.820° | |
86.560° | |
Physical characteristics | |
Dimensions | c/a = 0.68±0.05[4] |
88±2 km[4] 100.2±6.8 km (IRAS)[3] 94.48±5.37 km[5] | |
Mass | (1.3±0.9)×1018 kg[4] (1.74±0.49)×1018 kg[5] |
Mean density | 3.7±2.7 g/cm3[4] 3.92±1.29 g/cm3[5] |
13.686 h (0.5703 d)[6] | |
0.214 (calculated)[4] 0.1714[3] | |
S[3] | |
9.36 (brightest) | |
7.53[3] | |
Based upon its spectrum, this is classified as a stony S-type asteroid.[8] During 2000, speckle interferometry measurements from the Telescopio Nazionale Galileo in the Canary Islands were used to measure the apparent size and shape of 30 Urania. This gave cross-sectional dimensions equivalent to an ellipse with a length of 111 km and a width of 89 km, for a ratio of 0.80.[9]
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