2022 West

2022 West, provisional designation 1938 CK, is a stony asteroid from the middle regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 7 February 1938.[9] The asteroid was named after Danish astronomer Richard M. West.[2]

2022 West
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date7 February 1938
Designations
(2022) West
Named after
Richard M. West
(Danish astronomer)[2]
1938 CK · 1949 TA
1973 AP
main-belt · (middle)
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc79.12 yr (28,897 days)
Aphelion3.0268 AU
Perihelion2.3840 AU
2.7054 AU
Eccentricity0.1188
4.45 yr (1,625 days)
61.733°
0° 13m 17.4s / day
Inclination5.6594°
2.5076°
37.063°
Physical characteristics
Dimensions11.04±0.83 km[3]
12.634±0.341 km[4]
12.916±0.133 km[5]
26.64 km (calculated)[6]
14.14±0.01 h[7]
0.057 (assumed)[6]
0.1682±0.0207[5]
0.175±0.043[4]
0.230±0.036[3]
SMASS = S [1] · C [6]
11.6[1][6] · 11.63±0.05[7] · 11.70±0.19[8] · 12.0[3][5]

    Classification and orbit

    West orbits the Sun in the central main-belt at a distance of 2.4–3.0 AU once every 4 years and 5 months (1,625 days). Its orbit has an eccentricity of 0.12 and an inclination of 6° with respect to the ecliptic.[1] The asteroid observation arc begins at Heidelberg one month after its official discovery observation in March 1938.[9]

    Physical characteristics

    In the SMASS classification, West is a common S-type asteroid.[1]

    Lightcurves

    In November 2016, a first rotational lightcurve of West was obtained from photometric observations by Italian astronomers. Lightcurve analysis gave a rotation period of 14.14 hours with a brightness variation of 0.50 magnitude (U=3-).[7]

    Diameter

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, West measures between 11.04 and 12.916 kilometers in diameter and its surface has an albedo between 0.1682 and 0.23.[3][4][5]

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a much larger diameter of 26.64 kilometers using an absolute magnitude of 11.6.[6]

    Naming

    This minor planet was named after Danish astronomer Richard Martin West (born 1941), an observer and discoverer of minor planets at the European Southern Observatory in La Silla. West also discovered 76P/West–Kohoutek–Ikemura, a bright comet of the Jupiter family. He also was the International Astronomical Union's general secretary (1982–1985) and president of its Commission XX (1988–1991).[2] The official naming citation was published by the Minor Planet Center on 1 April 1978 (M.P.C. 4359).[10]

    References
    1. "JPL Small-Body Database Browser: 2022 West (1938 CK)" (2017-03-21 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
    2. Schmadel, Lutz D. (2007). "(2022) West". Dictionary of Minor Planet Names – (2022) West. Springer Berlin Heidelberg. p. 164. doi:10.1007/978-3-540-29925-7_2023. ISBN 978-3-540-00238-3.
    3. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    4. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 4 July 2017.
    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.
    6. "LCDB Data for (2022) West". Asteroid Lightcurve Database (LCDB). Retrieved 4 July 2017.
    7. Franco, Lorenzo; Marchini, Alessandro (April 2017). "Rotation Periods for 1751 Herget, 2022 West and (23997) 1999 RW27". The Minor Planet Bulletin. 44 (2): 93–94. Bibcode:2017MPBu...44...93F. ISSN 1052-8091. Retrieved 4 July 2017.
    8. Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 4 July 2017.
    9. "2022 West (1938 CK)". Minor Planet Center. Retrieved 4 July 2017.
    10. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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