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(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.

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. The first precovery was obtained at Palomar Observatory in 1953, extending the asteroid's observation arc by 39 years prior to its discovery.

Physical characteristics

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

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).

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), 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).

The rotation period of 1992 SK is slowly accelerating due to the YORP effect.

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 to 0.32, respectively. The ExploreNEOs project finds an albedo of 0.34, with an diameter of 0.9 kilometers, 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.

Numbering and naming

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

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. S2CID 44827674. 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. S2CID 41459166. 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. S2CID 35447010. Retrieved 1 April 2016.
6. ^ Ďurech, J.; et al. (2022). "Rotation acceleration of asteroids (10115) 1992 SK, (1685) Toro, and (1620) Geographos due to the YORP effect". Astronomy & Astrophysics. 657: A5. arXiv:2110.06548. Bibcode:2022A&A...657A...5D. doi:10.1051/0004-6361/202141844. S2CID 238744034.
7. ^ "LCDB Data for (10115)". Asteroid Lightcurve Database (LCDB). Retrieved 1 April 2016.
8. ^ 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.
9. 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.
10. ^ 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. PMC 7268210. PMID 32494788. Retrieved 1 April 2016.
11. 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.
12. 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. hdl:2060/20140012047. S2CID 119278697. Retrieved 1 April 2016.
13. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.

External links

• space.frieger.com – 3D Model of (10115) 1992 SK
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• (10115) 1992 SK at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• (10115) 1992 SK at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• (10115) 1992 SK at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Apollo asteroids
• Discoveries by Eleanor F. Helin
• Discoveries by Jeff T. Alu
• Potentially hazardous asteroids
• Astronomical objects discovered in 1992