(10115) 1992 SK

(10115) 1992 SK, is a stony near-Earth object and potentially hazardous asteroid on an eccentric orbit. It belongs to the group of Apollo asteroids and measures approximately 1 kilometer (0.6 miles) in diameter. It was discovered by American astronomers Eleanor Helin and Jeff Alu at the Palomar Observatory in California on 24 September 1992.[2]

(10115) 1992 SK
Discovery [1]
Discovered byE. F. Helin
J. Alu
Discovery sitePalomar Obs.
Discovery date24 September 1992
Designations
(10115) 1992 SK
1992 SK · 1985 SD
1985 TO2
Apollo · NEO · PHA [1][2]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.57 yr (23,219 days)
Aphelion1.6539 AU
Perihelion0.8429 AU
1.2484 AU
Eccentricity0.3248
1.39 yr (509 days)
47.505°
0° 42m 23.76s / day
Inclination15.322°
8.9232°
233.63°
Earth MOID0.0449 AU · 17.5 LD
Physical characteristics
Mean diameter
0.90±0.20 km[3]
0.938±0.294 km[4]
1.000±0.085 km[5]
1.18 km (calculated)[6]
7.31±0.02 h[7]
7.31832 h[8]
7.319 h[6]
7.323±0.005 h[9]
7.328±0.002 h[lower-alpha 1]
0.20 (assumed)[6]
0.2799±0.1397[5]
0.318±0.214[4]
0.34±0.25[3]
0.38±0.24[10]
SMASS = S [1] · S [6] · S/Sq [11]
17.0[1][4][5][6] · 17.4[lower-alpha 1]

    Classification and orbit

    The asteroid orbits the Sun at a distance of 0.8–1.7 AU once every 17 months (509 days). Its orbit has an eccentricity of 0.32 and an inclination of 15° with respect to the ecliptic. Its Earth minimum orbit intersection distance is 0.0449 AU (6,720,000 km). This makes the body a potentially hazardous asteroid, because its MOID is less than 0.05 AU and its diameter is greater than 150 meters.[1] The first precovery was obtained at Palomar Observatory in 1953, extending the asteroid's observation arc by 39 years prior to its discovery.[2]

    Physical characteristics

    In the SMASS classification, 1992 SK is characterized as a common stony S-type asteroid.[1]

    Rotation period

    Several rotational lightcurves form photometric observations have been obtained for this body. In 1999, Czech astronomer Petr Pravec constructed a lightcurve, that rendered a rotation period of 7.328 hours and a brightness variation of 0.72 in magnitude (U=n/a).[lower-alpha 1]

    In March 2006, observations by astronomer David Polishook from the ground-based Wise Observatory, Israel, gave a rotation period of 7.31 and amplitude of 0.70 mag (U=2),[7] and in November 2011, American astronomer Brian Warner at the Palmer Divide Observatory, Colorado, obtained the first well-defined period of 7.323 hours with an amplitude of 0.50 mag (U=3).[9]

    Diameter and albedo

    According to the surveys carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 1.0 and 0.94 kilometers in diameter and its surface has an albedo of 0.28 ot 0.32, respectively.[4][5] The ExploreNEOs project finds an albedo of 0.34, with an diameter of 0.9 kilometers,[3] and the Collaborative Asteroid Lightcurve Link calculates a diameter of 1.18 kilometers based on an assumed standard albedo for stony asteroids of 0.20 and an absolute magnitude of 17.0.[6]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 2 March 1999.[12] As of 2019, it has not been named.[2]

    Notes
    1. Pravec (1999) web: rotation period 7.328±0.002 hours with a brightness amplitude of 0.72 mag. Two more light-curves rendered similar periods. No quality rating by CALL. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (10115)

    References
    1. "JPL Small-Body Database Browser: 10115 (1992 SK)" (2017-05-08 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.
    2. "10115 (1992 SK)". Minor Planet Center. Retrieved 1 April 2016.
    3. Mueller, Michael; Delbo', M.; Hora, J. L.; Trilling, D. E.; Bhattacharya, B.; Bottke, W. F.; et al. (April 2011). "ExploreNEOs. III. Physical Characterization of 65 Potential Spacecraft Target Asteroids". The Astronomical Journal. 141 (4): 9. Bibcode:2011AJ....141..109M. doi:10.1088/0004-6256/141/4/109. Retrieved 1 April 2016.
    4. Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Cutri, R. M.; McMillan, R. S.; et al. (November 2012). "Physical Parameters of Asteroids Estimated from the WISE 3-Band Data and NEOWISE Post-Cryogenic Survey". The Astrophysical Journal Letters. 760 (1): 6. arXiv:1210.0502. Bibcode:2012ApJ...760L..12M. doi:10.1088/2041-8205/760/1/L12. Retrieved 1 April 2016.
    5. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 1 April 2016.
    6. "LCDB Data for (10115)". Asteroid Lightcurve Database (LCDB). Retrieved 1 April 2016.
    7. Polishook, David (July 2012). "Lightcurves and Spin Periods of Near-Earth Asteroids, The Wise Observatory, 2005 - 2010". The Minor Planet Bulletin. 39 (3): 187–192. Bibcode:2012MPBu...39..187P. ISSN 1052-8091. Retrieved 1 April 2016.
    8. Busch, Michael W.; Ostro, Steven J.; Benner, Lance A. M.; Giorgini, Jon D.; Jurgens, Raymond F.; Rose, Randy; et al. (March 2006). "Radar and optical observations and physical modeling of near-Earth Asteroid 10115 (1992 SK)". Icarus. 181 (1): 145–155. Bibcode:2006Icar..181..145B. doi:10.1016/j.icarus.2005.10.024. Retrieved 1 April 2016.
    9. Warner, Brian D. (April 2014). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2013 September–December". The Minor Planet Bulletin. 41 (2): 113–124. Bibcode:2014MPBu...41..113W. ISSN 1052-8091. Retrieved 1 April 2016.
    10. Thomas, C. A.; Trilling, D. E.; Emery, J. P.; Mueller, M.; Hora, J. L.; Benner, L. A. M.; et al. (September 2011). "ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population". The Astronomical Journal. 142 (3): 12. Bibcode:2011AJ....142...85T. doi:10.1088/0004-6256/142/3/85. Retrieved 1 April 2016.
    11. Thomas, Cristina A.; Emery, Joshua P.; Trilling, David E.; Delbó, Marco; Hora, Joseph L.; Mueller, Michael (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects". Icarus. 228: 217–246. arXiv:1310.2000. Bibcode:2014Icar..228..217T. doi:10.1016/j.icarus.2013.10.004. Retrieved 1 April 2016.
    12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
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