Astronomy:30 Urania

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30 Urania 24px (astrological)
Discovery[1]
Discovered byJ. R. Hind
Discovery dateJuly 22, 1854
Designations
(30) Urania
Pronunciation/jʊəˈreɪniə/ yoor-AY-nee-ə[2]
Named afterUrania
1948 JK
Minor planet categoryMain belt
Orbital characteristics[3]
Epoch 17.0 October 2024 (JD 2460600.5)
|{{{apsis}}}|helion}}398.863 Gm (2.666 astronomical unit|AU)
|{{{apsis}}}|helion}}309.039 Gm (2.066 AU)
353.951 Gm (2.366 AU)
Eccentricity0.127
Orbital period1,329.308 d (3.64 a)
Mean anomaly211.291°
Inclination2.093°
Longitude of ascending node307.403°
87.100°
Earth MOID1.07287 AU
Jupiter MOID2.74597 AU
TJupiter3.536
Physical characteristics
Dimensions112 km × 84 km × 76 km (± 5 km × 5 km × 4 km)[4]
Mean diameter88±2 km[4]
92.787±2.040 km (NEOWISE)[3]
94.48±5.37 km[5][lower-alpha 1]
Flattening0.32 ± 0.05[lower-alpha 2]
Mass(1.3±0.9)×1018 kg[4][lower-alpha 1]
(1.74±0.49)×1018 kg[5][lower-alpha 1]
Mean density3.7±2.7 g/cm3[4]
3.92±1.29 g/cm3[5]
Rotation period13.686 h (0.5703 d)[6][3]
Axial tilt72°[4]
Pole ecliptic latitude19°±2°[4]
Pole ecliptic longitude106°±2°[4]
Geometric albedo0.214 (calculated)[4]
0.192 ± 0.027[3]
S[3][4][5]
Apparent magnitude9.36 (brightest)
Absolute magnitude (H)7.59[3]
7.57[4]


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.

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]

The astrological symbol for Urania is 24px, compass calipers.[10]

Notes

  1. ↑ 1.0 1.1 1.2 Composite estimate.
  2. ↑ Flattening derived from the maximum aspect ratio (c/a): f=1−ca, where (c/a) = 0.68±0.05.[4]

References

  1. ↑ 1.0 1.1 "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html, retrieved 2013-04-07. 
  2. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Yeomans, Donald K., "30 Urania", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=30, retrieved 2024-12-24. 
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
  5. ↑ 5.0 5.1 5.2 5.3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C.  See Table 1.
  6. ↑ "EAR Derived Lightcurve Parameters, version 8", Planetary Data System Asteroid/Dust Archive (NASA), http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_DERIVED_LIGHTCURVE_V8_0/data/lc.tab, retrieved 2013-04-09. 
  7. ↑ Gunther, W. (December 2012), "Elements and ephemeris of (30) Urania", Astronomical Journal 4 (85): 103, doi:10.1086/100505, Bibcode: 1855AJ......4..103G.  See Table 1.
  8. ↑ DeMeo, Francesca E. et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared", Icarus 202 (1): 160–180, doi:10.1016/j.icarus.2009.02.005, Bibcode: 2009Icar..202..160D, http://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016%252Fj.icarus.2009.02.005.pdf, retrieved 2013-04-08.  See appendix A.
  9. ↑ Cellino, A. et al. (April 2003), "Speckle interferometry observations of asteroids at TNG", Icarus 162 (2): 278–284, doi:10.1016/S0019-1035(03)00006-X, Bibcode: 2003Icar..162..278C. 
  10. ↑ Miller, Kirk (18 October 2024). "Preliminary presentation of constellation symbols". The Unicode Consortium. https://www.unicode.org/L2/L2024/24235-constellation-symbols.pdf. 



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