(75482) 1999 XC173

(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]

(75482) 1999 XC173
Discovery [1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date10 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 arc16.82 yr (6,143 days)
Aphelion2.5436 AU
Perihelion2.1844 AU
2.3640 AU
Eccentricity0.0760
3.63 yr (1,328 days)
310.28°
0° 16m 16.32s / day
Inclination6.1205°
58.882°
48.553°
Physical characteristics
Dimensions2.96 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]

    Classification and orbit

    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]

    Physical characteristics

    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, 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]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 15 April 2004.[5] As of 2018, it has not been named.[4]

    References
    1. "JPL Small-Body Database Browser: 75482 (1999 XC173)" (2016-08-07 last obs.). Jet Propulsion Laboratory. Retrieved 1 June 2017.
    2. "LCDB Data for (75482)". Asteroid Lightcurve Database (LCDB). Retrieved 13 September 2016.
    3. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 13 September 2016.
    4. "75482 (1999 XC173)". Minor Planet Center. Retrieved 13 September 2016.
    5. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
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