4585 Ainonai

4585 Ainonai
Discovery [1]
Discovered by K. Endate
K. Watanabe
Discovery site Kitami Obs.
Discovery date 16 May 1990
Designations
MPC designation 4585 Ainonai
Named after
 Ainonai
(Japanese town)[2]
1990 KQ · 1972 LU
1978 WL12 · 1981 LC
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 43.81 yr (16,001 days)
Aphelion 3.3833 AU
Perihelion 2.0873 AU
2.7353 AU
Eccentricity 0.2369
4.52 yr (1,652 days)
276.0158°
0° 13m 4.44s / day
Inclination 10.5475°
83.0187°
184.0545°
Physical characteristics
Dimensions 10.920±0.122 km[4]
15.33 km (calculated)[3]
38.31±0.05 h[5]
0.1124±0.0109[4]
0.057 (assumed)[3]
C [3]
12.9[1]
12.8[3][4]
13.39±0.50[6]

    4585 Ainonai, provisional designation 1990 KQ, is a carbonaceous asteroid from the outer region of the asteroid belt, about 15 kilometers in diameter. It was discovered on 16 May 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory in eastern Hokkaidō, Japan.[7]

    The dark C-type asteroid orbits the Sun at a distance of 2.1–3.4 AU once every 4 years and 6 months (1,650 days). Its orbit has an eccentricity of 0.24 and is inclination of 11° with respect to the ecliptic.[1] The first precovery was obtained at Crimea–Nauchnij in 1972, extending the asteroid's observation arc by 18 years prior to its discovery.[7]

    A rotational light-curve was obtained from photometric observation made at the Via Capote Observatory, California, in June 2008. It showed a rotation period of 38.31±0.05 hours with a brightness amplitude of 0.30 in magnitude (U=3-)[5] According to observations from the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid has an albedo of 0.11 with a corresponding diameter of 10.9 kilometers.[4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 15.3 kilometers, based on an absolute magnitude of 12.8.[3]

    The minor planet is named after Ainonai, a small Japanese town located near Kitami in eastern Hokkaidō. The minor planets 3785 Kitami and 3720 Hokkaido are named after these two places.[2] Naming citation was published on 21 November 1991 (M.P.C. 19338).[8]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 4585 Ainonai (1990 KQ)" (2016-03-31 last obs.). Jet Propulsion Laboratory. Retrieved 3 May 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (4585) Ainonai. Springer Berlin Heidelberg. p. 395. ISBN 978-3-540-00238-3. Retrieved 3 May 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (4585) Ainonai". Asteroid Lightcurve Database (LCDB). Retrieved 3 May 2016.
    4. 1 2 3 4 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 3 May 2016.
    5. 1 2 Brinsfield, James W. (October 2008). "Asteroid Lightcurve Analysis at the Via Capote Observatory: 2nd Quarter 2008". The Minor Planet Bulletin. 35 (4): 179–181. Bibcode:2008MPBu...35..179B. ISSN 1052-8091. Retrieved 3 May 2016.
    6. ↑ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 3 May 2016.
    7. 1 2 "4585 Ainonai (1990 KQ)". Minor Planet Center. Retrieved 3 May 2016.
    8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 May 2016.

    External links

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