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150 Nuwa

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Main-belt asteroid

150 Nuwa
Discovery
3D convex shape model of 150 Nuwa
Discovered by	J. C. Watson
Discovery date	18 October 1875
Designations
MPC designation	(150) Nuwa
Pronunciation	/ˈnjuːwɑː/^{[citation needed]}
Named after	Nüwa
Alternative designations	A875 UA; 1908 AL; 2002 JR₇₀
Minor planet category	Main belt
Orbital characteristics^[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	116.94 yr (42714 d)
Aphelion	3.3586 AU (502.44 Gm)
Perihelion	2.6084 AU (390.21 Gm)
Semi-major axis	2.9835 AU (446.33 Gm)
Eccentricity	0.12573
Orbital period (sidereal)	5.15yr (1882.3d)
Mean anomaly	138.03°
Mean motion	0° 11^m 28.536^s / day
Inclination	2.1937°
Longitude of ascending node	206.21°
Argument of perihelion	151.84°
Physical characteristics
Dimensions	151.13±4.5 km^[1] 146.54 ± 9.15 km^[2]
Mass	(1.62 ± 0.20) × 10¹⁸ kg^[2]
Meandensity	0.98 ± 0.22 g/cm³^[2]
Synodic rotation period	8.14 hours^[3] 8.1347 h (0.33895 d)^[1]^[4]
Geometric albedo	0.0395±0.002
Spectral type	C^[5]
Absolute magnitude (H)	8.23

150 Nuwa is a largemain-belt asteroid with anorbital period of 5.15 years. It was discovered by Canadian-American astronomerJames Craig Watson on 18 October 1875,^[6] and named afterNüwa, theChinese creator goddess. This object is a candidate member of theHecuba group of asteroids that orbit near the 2:1mean-motion resonance withJupiter.^[7] Based upon the spectrum it is classified as aC-type asteroid,^[8] which indicates that it is probably composed of primitivecarbonaceous chondritic material and the surface is exceedingly dark.

Photometric observations of this asteroid at theCatania Astrophysical Observatory during 1992 and 1993 gave alight curve with a period of 8.140 ± 0.005 hours.^[3] In 2004, an additional photometric study was performed at Swilken Brae Observatory inSt Andrews, Fife, yielding a probable period of 8.1364 ± 0.0008 hours and a brightness variation of 0.26 ± 0.03 inmagnitude.^[9] A 2011 study from Organ Mesa Observatory inLas Cruces, New Mexico gave a period of 8.1347 ± 0.0001 hours with a brightness variation of 0.17 ± 0.02 magnitude, which is consistent with prior results.^[4]

On 17 December 1999, astar wasocculted by Nuwa.^{[citation needed]}

References

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^^a ^b ^cYeomans, Donald K.,"150 Nuwa",JPL Small-Body Database Browser,NASA Jet Propulsion Laboratory, retrieved12 May 2016.
^^a ^b ^cCarry, 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.
^^a ^bBlanco, C.; et al. (February 1996), "Lightcurves, pole direction and shape of asteroids 121 Hermione, 150 Nuwa, 236 Honoria, 287 Nephthys and 377 Campania",Planetary and Space Science,44 (2):93–106,Bibcode:1996P&SS...44...93B,doi:10.1016/0032-0633(95)00097-6.
^^a ^bPilcher, Frederick (July 2011), "Rotation Period Determinations for 28 Bellona, 81 Terpsichore, 126 Velleda, 150 Nuwa, 161 Athor, 419 Aurelia, and 632 Pyrrha",The Minor Planet Bulletin,38 (3):156–158,Bibcode:2011MPBu...38..156P.
^Richmond, Michael,Asteroid Lightcurve Data File, Updated March 1, 2001, retrieved3 April 2013.
^"Numbered Minor Planets 1–5000",Discovery Circumstances, IAU Minor Planet center, retrieved7 April 2013.
^McDonald, Sophia Levy (June 1948),"General perturbations and mean elements, with representations of 35 minor planets of the Hecuba group",Astronomical Journal,53: 199,Bibcode:1948AJ.....53..199M,doi:10.1086/106097.
^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 fromthe original(PDF) on 17 March 2014, retrieved8 April 2013. See appendix A.
^Vincent, Fiona (August 2006), "The lightcurve of (150) Nuwa",Journal of the British Astronomical Association,116 (4):200–202,Bibcode:2006JBAA..116..200V.

External links

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Image taken on 25, 26, 27 September 2009 from Slooh Robotic Telescope (Teide - Canary Islands):"Title Unknown".Archived from the original on 14 July 2011. Retrieved5 October 2009.
Image taken on 3 October 2009 from Slooh Robotic Telescope (Teide - Canary Islands):"Title Unknown".Archived from the original on 14 July 2011. Retrieved6 November 2009.
Image taken on 23 October 2009 from Slooh Robotic Telescope (Teide - Canary Islands):"Title Unknown".Archived from the original on 14 July 2011. Retrieved6 November 2009.
150 Nuwa atAstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
150 Nuwa at theJPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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