30 Urania

30 Urania
Discovery
Discovered by	J. R. Hind
Discovery date	July 22, 1854
Designations
MPC designation	(30) Urania
Pronunciation	/jʊəˈreɪniə/ yoor-AY-nee-ə
Named after	Urania
Alternative designations	1948 JK
Minor planet category	Main belt
Symbol	(astrological)
Orbital characteristics
	Epoch 17.0 October 2024 (JD 2460600.5)
Aphelion	398.863 Gm (2.666 AU)
Perihelion	309.039 Gm (2.066 AU)
Semi-major axis	353.951 Gm (2.366 AU)
Eccentricity	0.127
Orbital period (sidereal)	1,329.308 d (3.64 a)
Mean anomaly	211.291°
Inclination	2.093°
Longitude of ascending node	307.403°
Argument of perihelion	87.100°
Earth MOID	1.07287 AU
Jupiter MOID	2.74597 AU
TJupiter	3.536
Physical characteristics
Dimensions	112 km × 84 km × 76 km (± 5 km × 5 km × 4 km)
Mean diameter	88±2 km; 92.787±2.040 km (NEOWISE); 94.48±5.37 km
Flattening	0.32 ± 0.05
Mass	(1.3±0.9)×1018 kg ; (1.74±0.49)×1018 kg
Mean density	3.7±2.7 g/cm3; 3.92±1.29 g/cm3
Synodic rotation period	13.686 h (0.5703 d)
Axial tilt	72°
Pole ecliptic latitude	19°±2°
Pole ecliptic longitude	106°±2°
Geometric albedo	0.214 (calculated); 0.192 ± 0.027
Spectral type	S
Apparent magnitude	9.36 (brightest)
Absolute magnitude (H)	7.59; 7.57

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 , compass calipers.^[10]

Notes

^ ^a ^b ^c Composite estimate.
^ Flattening derived from the maximum aspect ratio (c/a): $f=1-{\frac {c}{a}}$ , where (c/a) = 0.68±0.05.^[4]

References

^ ^a ^b "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, archived from the original on 22 February 2012, retrieved 7 April 2013.
^ Noah Webster (1884) A Practical Dictionary of the English Language
^ ^a ^b ^c ^d ^e ^f Yeomans, Donald K., "30 Urania", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, archived from the original on 11 June 2011, retrieved 24 December 2024.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
^ ^a ^b ^c ^d Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 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, archived from the original on 13 September 2006, retrieved 9 April 2013.
^ 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" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. 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, CiteSeerX 10.1.1.532.4091, doi:10.1016/S0019-1035(03)00006-X.
^ Miller, Kirk (18 October 2024). "Preliminary presentation of constellation symbols" (PDF). unicode.org. The Unicode Consortium. Archived (PDF) from the original on 2 November 2024. Retrieved 22 October 2024.

External links

Keck image of Urania (Marchis 2011 November 11)
30 Urania at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
30 Urania at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[Composite-6] Composite estimate.

[7] Flattening derived from the maximum aspect ratio (c/a): $f=1-{\frac {c}{a}}$ , where (c/a) = 0.68±0.05.^[4]

[IAU_MPC-1] "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, archived from the original on 22 February 2012, retrieved 7 April 2013.

[2] Noah Webster (1884) A Practical Dictionary of the English Language

[JPL-3] ^ ^a ^b ^c ^d ^e ^f Yeomans, Donald K., "30 Urania", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, archived from the original on 11 June 2011, retrieved 24 December 2024.

[VLT-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56

[Carry2012-5] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[EAR_lc-8] "EAR Derived Lightcurve Parameters, version 8", Planetary Data System Asteroid/Dust Archive, NASA, archived from the original on 13 September 2006, retrieved 9 April 2013.

[Gunther1855-9] 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.

[DeMeo2009-10] DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.

[Cellino2003-11] Cellino, A.; et al. (April 2003), "Speckle interferometry observations of asteroids at TNG", Icarus, 162 (2): 278–284, Bibcode:2003Icar..162..278C, CiteSeerX 10.1.1.532.4091, doi:10.1016/S0019-1035(03)00006-X.

[12] Miller, Kirk (18 October 2024). "Preliminary presentation of constellation symbols" (PDF). unicode.org. The Unicode Consortium. Archived (PDF) from the original on 2 November 2024. Retrieved 22 October 2024.

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