(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]
| Discovery[1] | |
|---|---|
| Discovered by | E. F. Helin J. Alu |
| Discovery site | Palomar Obs. |
| Discovery date | 24 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 arc | 63.57 yr (23,219 days) |
| Aphelion | 1.6539 AU |
| Perihelion | 0.8429 AU |
| 1.2484 AU | |
| Eccentricity | 0.3248 |
| 1.39 yr (509 days) | |
| 47.505° | |
| 0° 42m 23.76s / day | |
| Inclination | 15.322° |
| 8.9232° | |
| 233.63° | |
| Earth MOID | 0.0449 AU · 17.5 LD |
| Physical characteristics | |
| 0.90±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] | |
| 7.31±0.02 h[8] 7.31832 h[9] 7.319 h[7] 7.323±0.005 h[10] 7.328±0.002 h[a] 7.320232±0.000010 h[6] | |
| 0.20 (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] | |
| 17.0[1][4][5][7] · 17.4[a] | |
Classification and orbit
editThe 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
editIn the SMASS classification, 1992 SK is characterized as a common stony S-type asteroid.[1]
Rotation period
editSeveral 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).[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),[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 (U=3).[10]
The rotation period of 1992 SK is slowly accelerating due to the YORP effect.[6]
Diameter and albedo
editAccording 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
editThis minor planet was numbered by the Minor Planet Center on 2 March 1999.[13] As of 2019[update], it has not been named.[2]
Notes
edit- ^ a b c 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
edit- ^ a b c d e f g "JPL Small-Body Database Browser: 10115 (1992 SK)" (2017-05-08 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.
- ^ a b c d "10115 (1992 SK)". Minor Planet Center. Retrieved 1 April 2016.
- ^ a b c 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.
- ^ a b c d 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.
- ^ a b c d 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.
- ^ a b c 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.
- ^ a b c d e f "LCDB Data for (10115)". Asteroid Lightcurve Database (LCDB). Retrieved 1 April 2016.
- ^ a b 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.
- ^ 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.
- ^ a b 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.
- ^ 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.
- ^ 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.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
External links
edit- 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
- (10115) 1992 SK at ESA–space situational awareness
- (10115) 1992 SK at the JPL Small-Body Database
