3785 Kitami

3785 Kitami, provisional designation 1986 WM, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 19 kilometers in diameter. The asteroid was discovered by Japanese astronomer Tsutomu Seki at Geisei Observatory on 30 November 1986, and named after the city of Kitami, Japan.[8]

3785 Kitami
Discovery [1]
Discovered byT. Seki
Discovery siteGeisei Obs.
Discovery date30 November 1986
Designations
(3785) Kitami
Named after
Kitami (Japanese city)[2]
1986 WM · 1934 TG
1957 UM · 1979 OO2
1980 UU
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc37.95 yr (13,862 days)
Aphelion3.7830 AU
Perihelion2.6903 AU
3.2367 AU
Eccentricity0.1688
5.82 yr (2,127 days)
143.00°
0° 10m 9.48s / day
Inclination1.9225°
151.03°
237.05°
Physical characteristics
Dimensions17.06 km (calculated)[3]
19.761±0.269[4]
20.536±0.187 km[5]
3.7992±0.0004 h[6]
0.0664±0.0133[5]
0.072±0.021[4]
0.08 (assumed)[3]
C [3][7]
12.0[5] · 12.11±0.18[7] · 12.2[1][3]

    Orbit and classification

    The C-type asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.8 AU once every 5 years and 10 months (2,127 days). Its orbit has an eccentricity of 0.17 and an inclination of 2° with respect to the ecliptic.[1] The first observation was made at Simeiz Observatory in 1934, and the first used precovery was taken at the Australian Siding Spring Observatory in 1979, extending the asteroid's observation arc by 7 years prior to its official discovery date.[8]

    Physical characteristics

    Rotation period

    In December 2009, a rotational lightcurve of Kitami was obtained from photometric observations by amateur astronomer René Roy at his at Blauvac Observatory, France. The lightcurve gave a rotation period of 3.7992±0.0004 hours with a brightness variation of 0.30 in magnitude (U=3-).[6]

    Diameter and albedo

    Based on the survey carried out by NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Kitami measures 19.7 and 20.5 kilometers in diameter and its surface has an albedo of 0.066 and 0.072, respectively,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 17.1 kilometers.[3]

    Naming

    This minor planet was named for the Japanese city of Kitami, where the Kitami Observatory is located. It is known for its many astrometric observations of small Solar System bodies by several amateur astronomers. Kitami is a "friendship city" of the discoverer’s own city of Kochi (also see 2396 Kochi), and is located on the island on Hokkaido, after which the minor planet 3720 Hokkaido is named.[2] The official naming citation was published by the Minor Planet Center on 27 August 1988 (M.P.C. 13482).[9]

    References
    1. "JPL Small-Body Database Browser: 3785 Kitami (1986 WM)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 19 June 2017.
    2. Schmadel, Lutz D. (2007). "(3785) Kitami". Dictionary of Minor Planet Names – (3785) Kitami. Springer Berlin Heidelberg. p. 320. doi:10.1007/978-3-540-29925-7_3780. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (3785) Kitami". Asteroid Lightcurve Database (LCDB). Retrieved 3 August 2016.
    4. 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. Retrieved 5 December 2016.
    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. Retrieved 3 August 2016.
    6. Behrend, Raoul. "Asteroids and comets rotation curves – (3785) Kitami". Geneva Observatory. Retrieved 3 August 2016.
    7. 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 3 August 2016.
    8. "3785 Kitami (1986 WM)". Minor Planet Center. Retrieved 3 August 2016.
    9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 August 2016.

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