(154276)_2002_SY50

<span class="nowrap">(154276) 2002 SY<sub>50</sub></span>

(154276) 2002 SY50

Asteroid

(154276) 2002 SY50, provisional designation 2002 SY50, is a stony asteroid on a highly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.1 kilometers (0.7 miles) in diameter. It was discovered on 30 September 2002, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States.[1] The K-type asteroid has a rotation period of 4.8 hours.[3][lower-alpha 1] It will make a close encounter with Earth on 30 October 2071.[6]

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Orbit and classification

2002 SY50 is a member of the Earth-crossing group of Apollo asteroids, the largest group of near-Earth objects with approximately 10 thousand known members.[1][2]

It orbits the Sun at a distance of 0.53–2.88 AU once every 2 years and 3 months (813 days; semi-major axis of 1.7 AU). Its orbit has an eccentricity of 0.69 and an inclination of 9° with respect to the ecliptic.[2] Due to its large aphelion of 2.88 AU, it also crosses the orbit of Mars at 1.66 AU.[2] The body's observation arc begins one month prior to its official discovery observation with its first observation by the NEAT program at Palomar Observatory in August 2002.[1]

Close approaches

The asteroid has an Earth minimum orbital intersection distance of 0.0027 AU (404,000 km; 251,000 mi), which corresponds to 1.05 lunar distances and makes it a potentially hazardous asteroid due to its sufficiently large size.[2]

In November 1933, it approached Earth at a nominal distance of 0.098 AU (38 LD), and in November 2002 at 0.084 AU (33 LD). Its closest near-Earth encounter is predicted to occur on 30 October 2071, at a distance of 0.0088 AU (3.4 LD) only (see table).[6]

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History of close approaches of large near-Earth objects since 1908 (A)

Physical characteristics

Photometry by the Sloan Digital Sky Survey has characterized 2002 SY50 as an uncommon K-type asteroid,[5] which is typically seen among members of the Eos family in the asteroid belt.[7]: 23 

Rotation period

In October 2002, a rotational lightcurve of this asteroid was obtained from photometric observations by Italian astronomer Gianluca Masi at the Campo Catino Astronomical Observatory (468). Lightcurve analysis gave a well-defined rotation period of 4.823 hours with a brightness amplitude of 0.52 magnitude (U=3).[lower-alpha 1]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, this asteroid measures 1.06 kilometers in diameter and its surface has an albedo of 0.14,[4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 0.897 kilometers based on an absolute magnitude of 17.6.[3]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 2 April 2007 (M.P.C. 59337).[8] As of 2018, it has not been named.[1]

Notes

  1. Lightcurve plot of (154276) 2002 SY50 from October 2002. Rotation period 4.823 hours with a brightness amplitude of 0.52 mag. Quality code of 3. Summary figures at the LCDB.

References

  1. [1]
    "154276 (2002 SY50)". Minor Planet Center. Retrieved 20 April 2018.
  2. [2]
    "JPL Small-Body Database Browser: 154276 (2002 SY50)" (2014-06-07 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2018.
  3. [3]
    "LCDB Data for (154276)". Asteroid Lightcurve Database (LCDB). Retrieved 20 April 2018.
  4. [4]
    Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID 9341381.
  5. [5]
    Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. S2CID 119258489.
  6. [6]
    "Close-Approach Data, JPL Small-Body Database Browser: 154276 (2002 SY50)". Jet Propulsion Laboratory. Retrieved 20 April 2018.
  7. [7]
    Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
  8. [8]
    "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 April 2018.
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