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(10115) 1992 SK

Apollo minor planet, NEO and PHA From Wikipedia, the free encyclopedia

(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]

Quick Facts Discovery, Discovered by ...
(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
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]
    Close

    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

    Summarize
    Perspective

    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).[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

    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. 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

    External links

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