Astronomy:(10115) 1992 SK

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Short description: Apollo minor planet, NEO and PHA
(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
Minor planet categoryApollo · NEO · PHA[1][2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.57 yr (23,219 days)
|{{{apsis}}}|helion}}1.6539 AU
|{{{apsis}}}|helion}}0.8429 AU
1.2484 AU
Eccentricity0.3248
Orbital period1.39 yr (509 days)
Mean anomaly47.505°
Mean motion0° 42m 23.76s / day
Inclination15.322°
Longitude of ascending node8.9232°
233.63°
Earth MOID0.0449 AU · 17.5 LD
Physical characteristics
Mean diameter0.90±0.20 km[3]
0.938±0.294 km[4]
1.000±0.085 km[5]
1.0±0.2[6]
1.18 km (calculated)[7]
Rotation period7.31±0.02 h[8]
7.31832 h[9]
7.319 h[7]
7.323±0.005 h[10]
7.328±0.002 h[lower-alpha 1]
7.320232±0.000010 h[6]
Geometric albedo0.20 (assumed)[7]
0.2799±0.1397[5]
0.318±0.214[4]
0.34±0.25[3]
0.38±0.24[11]
SMASS = S[1] · S[7] · S/Sq[12]
Absolute magnitude (H)17.0[1][4][5][7] · 17.4[lower-alpha 1]


(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]

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 ({{{1}}}).[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 ({{{1}}}),[8] 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 ({{{1}}}).[10]

The rotation period of 1992 SK is slowly accelerating due to the YORP effect.[6]

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.[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.[7]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 2 March 1999.[13] (As of 2019), it has not been named.[2]

Notes

  1. ↑ 1.0 1.1 1.2 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "JPL Small-Body Database Browser: 10115 (1992 SK)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2010115. Retrieved 26 May 2017. 
  2. ↑ 2.0 2.1 2.2 2.3 "10115 (1992 SK)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=10115. Retrieved 1 April 2016. 
  3. ↑ 3.0 3.1 3.2 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. doi:10.1088/0004-6256/141/4/109. Bibcode: 2011AJ....141..109M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011AJ....141..109M. Retrieved 1 April 2016. 
  4. ↑ 4.0 4.1 4.2 4.3 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. doi:10.1088/2041-8205/760/1/L12. Bibcode: 2012ApJ...760L..12M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...760L..12M. Retrieved 1 April 2016. 
  5. ↑ 5.0 5.1 5.2 5.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M. Retrieved 1 April 2016. 
  6. ↑ 6.0 6.1 6.2 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. doi:10.1051/0004-6361/202141844. Bibcode: 2022A&A...657A...5D. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 "LCDB Data for (10115)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=10115%7C. Retrieved 1 April 2016. 
  8. ↑ 8.0 8.1 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. ISSN 1052-8091. Bibcode: 2012MPBu...39..187P. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39..187P. 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. doi:10.1016/j.icarus.2005.10.024. Bibcode: 2006Icar..181..145B. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2006Icar..181..145B. Retrieved 1 April 2016. 
  10. ↑ 10.0 10.1 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. ISSN 1052-8091. PMID 32494788. PMC 7268210. Bibcode: 2014MPBu...41..113W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..113W. 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. doi:10.1088/0004-6256/142/3/85. Bibcode: 2011AJ....142...85T. 
  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. doi:10.1016/j.icarus.2013.10.004. Bibcode: 2014Icar..228..217T. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014Icar..228..217T. Retrieved 1 April 2016. 
  13. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 24 February 2018. 

External links



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