2531 Cambridge

2531 Cambridge, provisional designation 1980 LD, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 11 June 1980, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Arizona, United States. The asteroid was named for the Cambridge University.[2]

2531 Cambridge
Discovery [1]
Discovered byE. Bowell
Discovery siteAnderson Mesa Stn.
Discovery date11 June 1980
Designations
(2531) Cambridge
Named after
Cambridge (UK) and Cambridge, MA (USA)[2]
1980 LD · 1931 AP
1942 EQ · 1952 BG
1963 FK · 1963 HD
1971 VY · 1974 KH
A916 FE
main-belt · (outer)
Eos [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.40 yr (31,557 days)
Aphelion3.1787 AU
Perihelion2.8383 AU
3.0085 AU
Eccentricity0.0566
5.22 yr (1,906 days)
199.25°
0° 11m 20.04s / day
Inclination11.032°
104.36°
32.390°
Physical characteristics
Mean diameter
19.15±1.9 km[5]
19.15 km (derived)[3]
22.349±0.196 km[6]
22.911±0.130 km[7]
23.44±0.95 km[8]
8.80±0.01 h[9]
12.200±0.0032 h[10]
0.147±0.014[8]
0.1491±0.0193[7]
0.166±0.026[6]
0.2102 (derived)[3]
0.2104±0.050[5]
S (assumed)[3]
10.712±0.001 (R)[1][3][5][7][8][10]

    Classification and orbit

    Cambridge is a member of the Eos family (606),[3][4] the largest asteroid family in the outer main belt consisting of nearly 10,000 known asteroids.[11]: 23  It orbits the Sun at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,906 days). Its orbit has an eccentricity of 0.06 and an inclination of 11° with respect to the ecliptic.[1]

    It was first identified as A916 FE Simeiz Observatory in 1916. The body's observation arc begins with a precovery taken at Lowell Observatory in 1931, or 49 years prior to its official discovery observation at Anderson Mesa.[2]

    Physical characteristics

    Cambridge is an assumed stony S-type asteroid,[3] in line with the overall spectral type for members of the Eos family.[11]: 23 

    Rotation period

    In February 2004, a rotational lightcurve of Cambridge was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 8.80 hours with a brightness variation of 0.21 magnitude (U=2-).[9] In October 2010, observations at the Palomar Transient Factory, California, gave a longer period of 12.200 hours with an amplitude of 0.20 magnitude (U=2).[10]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Cambridge measures between 19.15 and 23.44 kilometers in diameter and its surface has an albedo between 0.147 and 0.2104.[5][6][7][8]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2102 and a diameter of 19.15 kilometers with an absolute magnitude of 10.9, identical with the results obtained by IRAS.[3][5]

    Naming

    This minor planet was named after the University of Cambridge in England and the universities in the city of Cambridge, Massachusetts (United States), where the Minor Planet Center (MPC) is located at the Smithsonian Astrophysical Observatory.[2] The approved naming citation was published by the MPC on 8 April 1982 (M.P.C. 6834).[12]

    References
    1. "JPL Small-Body Database Browser: 2531 Cambridge (1980 LD)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 18 June 2017.
    2. "2531 Cambridge (1980 LD)". Minor Planet Center. Retrieved 18 June 2017.
    3. "LCDB Data for (2531) Cambridge". Asteroid Lightcurve Database (LCDB). Retrieved 18 June 2017.
    4. "Asteroid 2531 Cambridge – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    6. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
    7. 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.
    8. 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. (online, AcuA catalog p. 153)
    9. Behrend, Raoul. "Asteroids and comets rotation curves – (2531) Cambridge". Geneva Observatory. Retrieved 18 June 2017.
    10. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75.
    11. 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.
    12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 June 2017.

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