2751 Campbell

2751 Campbell, provisional designation 1962 RP, is a stony Nysian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter.

2751 Campbell
Discovery [1]
Discovered byIndiana University
(Indiana Asteroid Program)
Discovery siteGoethe Link Obs.
Discovery date7 September 1962
Designations
(2751) Campbell
Named after
William Wallace Campbell (American astronomer)[2]
1962 RP · 1973 RD
1975 EO2 · 1977 RN6
1981 WF4
main-belt · Nysa [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc54.74 yr (19,995 days)
Aphelion2.8245 AU
Perihelion1.9880 AU
2.4062 AU
Eccentricity0.1738
3.73 yr (1,363 days)
191.78°
0° 15m 50.76s / day
Inclination1.4901°
246.29°
201.65°
Physical characteristics
Dimensions5.73±1.14 km[4]
6.907±0.287 km[5][6]
7.46 km (calculated)[3]
2.747±0.001 h[7]
0.20 (assumed)[3]
0.281±0.011[5][6]
0.30±0.14[4]
S [3]
12.75±0.31[8] · 12.8[5] · 13.0[1][3] · 13.34[4]

    It was discovered on 7 September 1962, by IU's Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States.[9] It is named for American astronomer William Wallace Campbell.[2]

    Classification and orbit

    Campbell is a member of the stony subgroup of the Nysa family (FIN: 405), a group of asteroids in the inner main-belt not far from the Kirkwood gap at 2.5 AU, a depleted zone where a 3:1 orbital resonance with the orbit of Jupiter exists. The Nysian group is named after its largest member 44 Nysa.

    It orbits the Sun in the inner main-belt at a distance of 2.0–2.8 AU once every 3 years and 9 months (1,363 days). Its orbit has an eccentricity of 0.17 and an inclination of 1° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation, as no precoveries were taken, and no prior identifications were made.[9]

    Physical characteristics

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Campbell measures 5.73 and 6.907 kilometers in diameter, and its surface has an albedo of 0.30 and 0.281, respectively,[4][5][6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a larger diameter of 7.46 kilometers, with an absolute magnitude of 13.0.[3] Campbell is an assumed S-type asteroid.[3]

    Rotation and shape

    In November 2007, a rotational lightcurve of Campbell was obtained from photometric observations by French amateur astronomer Pierre Antonini. Lightcurve analysis gave a rotation period of 2.747 hours with a brightness variation of 0.08 magnitude, which indicates, that the body has a nearly spheroidal shape (U=3-).[7]

    Naming

    This minor planet was named in memory of American astronomer William Wallace Campbell (1862–1938), an observational spectroscopist and one of the first to measure the radial velocity of a large number of stars. In the 1920s and 1930s, Campbell was heading the U.S. National Academy of Sciences, the International Astronomical Union, and the University of California, and he was director of the Lick Observatory from 1901 to 1930. The lunar crater Campbell, as well as the Martian crater Campbell were named in his honor.[2] The approved naming citation was published by the Minor Planet Center on 5 November 1987 (M.P.C. 12457).[10]

    References
    1. "JPL Small-Body Database Browser: 2751 Campbell (1962 RP)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 3 July 2017.
    2. Schmadel, Lutz D. (2007). "(2751) Campbell". Dictionary of Minor Planet Names – (2751) Campbell. Springer Berlin Heidelberg. p. 225. doi:10.1007/978-3-540-29925-7_2752. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2751) Campbell". Asteroid Lightcurve Database (LCDB). Retrieved 23 March 2017.
    4. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 23 March 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. 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 23 March 2017.
    7. Behrend, Raoul. "Asteroids and comets rotation curves – (2751) Campbell". Geneva Observatory. Retrieved 23 March 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 23 March 2017.
    9. "2751 Campbell (1962 RP)". Minor Planet Center. Retrieved 23 March 2017.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 23 March 2017.

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