150 Nuwa

Nuwa (minor planet designation: 150 Nuwa) is a large main-belt asteroid with an orbital period of 5.15 years. It was discovered by Canadian-American astronomer James Craig Watson on October 18, 1875,[6] and named after Nüwa, the Chinese creator goddess. This object is a candidate member of the Hecuba group of asteroids that orbit near the 2:1 mean-motion resonance with Jupiter.[7] Based upon the spectrum it is classified as a C-type asteroid,[8] which indicates that it is probably composed of primitive carbonaceous chondritic material and the surface is exceedingly dark.

150 Nuwa
Discovery
Discovered byJ. C. Watson
Discovery date18 October 1875
Designations
(150) Nuwa
Pronunciation/ˈnjuːwɑː/
Named after
Nüwa
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc116.94 yr (42714 d)
Aphelion3.3586 AU (502.44 Gm)
Perihelion2.6084 AU (390.21 Gm)
2.9835 AU (446.33 Gm)
Eccentricity0.12573
5.15 yr (1882.3 d)
138.03°
0° 11m 28.536s / day
Inclination2.1937°
206.21°
151.84°
Physical characteristics
Dimensions151.13±4.5 km[1]
146.54 ± 9.15 km[2]
Mass(1.62 ± 0.20) × 1018 kg[2]
Mean density
0.98 ± 0.22 g/cm3[2]
8.14 hours[3]
8.1347 h (0.33895 d)[1][4]
0.0395±0.002
C[5]
8.23

    Photometric observations of this asteroid at the Catania Astrophysical Observatory during 1992 and 1993 gave a light curve with a period of 8.140 ± 0.005 hours.[3] In 2004, an additional photometric study was performed at Swilken Brae Observatory in St Andrews, Fife, yielding a probable period of 8.1364 ± 0.0008 hours and a brightness variation of 0.26 ± 0.03 in magnitude.[9] A 2011 study from Organ Mesa Observatory in Las 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 December 17, 1999, a star was occulted by Nuwa.

    References
    1. Yeomans, Donald K., "150 Nuwa", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    2. 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.
    3. Blanco, 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.
    4. Pilcher, 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.
    5. Richmond, Michael, Asteroid Lightcurve Data File, Updated March 1, 2001, retrieved 3 April 2013.
    6. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    7. 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.
    8. 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.
    9. Vincent, Fiona (August 2006), "The lightcurve of (150) Nuwa", Journal of the British Astronomical Association, 116 (4): 200–202, Bibcode:2006JBAA..116..200V.
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