30 Urania
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Not to be confused with the Solar system planet Uranus.
| Discovery[1] | |
|---|---|
| Discovered by | J. R. Hind |
| Discovery date | July 22, 1854 |
| Designations | |
| Pronunciation | /jʊˈreɪniə/ ew-RAY-nee-ə |
| Named after | Urania |
| Alternative names | 1948 JK |
| Minor planet category | Main belt |
| Orbital characteristics[2] | |
| Epoch June 14, 2006 (JD 2453900.5) | |
| Aphelion | 398.817 Gm (2.666 AU) |
| Perihelion | 309.338 Gm (2.068 AU) |
| Semi-major axis | 354.077 Gm (2.367 AU) |
| Eccentricity | 0.126 |
| Orbital period | 1,330.017 d (3.64 a) |
| Average orbital speed | 19.28 km/s |
| Mean anomaly | 196.549° |
| Inclination | 2.097° |
| Longitude of ascending node | 307.820° |
| Argument of perihelion | 86.560° |
| Physical characteristics | |
| Dimensions |
100.2 ± 6.8 km (IRAS)[2] 94.48 ± 5.37[3] km |
| Mass | (1.74 ± 0.49) × 1018[3] kg |
| Mean density | 3.92 ± 1.29[3] g/cm3 |
| Equatorial surface gravity | 0.0280? m/s² |
| Escape velocity | 0.0529? km/s |
| Rotation period | 0.57025 d (13.686 h)[4] |
| Albedo | 0.1714 (geometric)[2] |
| Temperature | ~177 K |
| Spectral type | S[2] |
| Apparent magnitude | 9.36 (brightest) |
| Absolute magnitude (H) | 7.53[2] |
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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.[5]
Based upon its spectrum, this is classified as a stony S-type asteroid.[6] 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.[7]
References
- ↑ 1.0 1.1 "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ↑ 2.0 2.1 2.2 2.3 2.4 Yeomans, Donald K., "30 Urania", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-04-09.
- ↑ 3.0 3.1 3.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ "EAR Derived Lightcurve Parameters, version 8", Planetary Data System Asteroid/Dust Archive (NASA), retrieved 2013-04-09.
- ↑ Gunther, W. (December 2012), "Elements and ephemeris of (30) Urania", Astronomical Journal 4 (85): 103, Bibcode:1855AJ......4..103G, doi:10.1086/100505. See Table 1.
- ↑ DeMeo, Francesca E. et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared", Icarus 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 2013-04-08. See appendix A.
- ↑ Cellino, A. et al. (April 2003), "Speckle interferometry observations of asteroids at TNG", Icarus 162 (2): 278–284, Bibcode:2003Icar..162..278C, doi:10.1016/S0019-1035(03)00006-X.
External links
- JPL Ephemeris
- Keck image of Urania (Marchis 2011 November 11)
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