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(75482) 1999 XC173 is a stony Vestian asteroid and an exceptionally slow rotating body from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 10 December 1999, by LINEAR at Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, United States.[4]
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 10 December 1999 |
| Designations | |
| (75482) 1999 XC173 | |
| 1999 XC173 · 2001 KY49 | |
| main-belt · Vestian[2] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 16.82 yr (6,143 days) |
| Aphelion | 2.5436 AU |
| Perihelion | 2.1844 AU |
| 2.3640 AU | |
| Eccentricity | 0.0760 |
| 3.63 yr (1,328 days) | |
| 310.28° | |
| 0° 16m 16.32s / day | |
| Inclination | 6.1205° |
| 58.882° | |
| 48.553° | |
| Physical characteristics | |
| Dimensions | 2.96 km (calculated)[2] |
| 1234.1709±89.9916 h[3] | |
| 0.20 (assumed)[2] | |
| S[2] | |
| 14.5[1] · 14.557±0.004 (R)[3] · 15.01[2] | |
The body is classified as a S-type member of the Vesta family by the Collaborative Asteroid Lightcurve Link's Light Curve Data Base (LCDB) .[2] It orbits the Sun at a distance of 2.2–2.5 AU once every 3 years and 8 months (1,328 days). Its orbit has an eccentricity of 0.08 and an inclination of 6° with respect to the ecliptic.[1] A first precovery was obtained at the discovering observatory in October 1999, extending the asteroid's observation arc by 2 months prior to its official discovery observation.[4]
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A rotational lightcurve was obtained for this asteroid from photometric observations at the Californian Palomar Transient Factory in September 2013. It gave a rotation period of 1234 hours with an estimated error margin of ±90 hours. As of 2016[update], it is the 6th slowest rotating minor planet known to exist. Its high brightness variation of 0.69 magnitude indicates that it has a non-spheroidal shape (U=2).[3]
According to the LCDB, the body's surface has an assumed standard albedo for stony asteroids of 0.20 and a calculated diameter of 2.96 kilometers with an absolute magnitude of 15.01.[2]
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This minor planet was numbered by the Minor Planet Center on 15 April 2004.[5] As of 2018, it has not been named.[4]
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