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, near Kitami
(Japanese town)[2]
1990 KQ · 1972 LU
1978 WL12 · 1981 LC
main-belt · (middle)
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 44.99 yr (16,432 days)
Aphelion 3.3805 AU
Perihelion 2.0884 AU
2.7344 AU
Eccentricity 0.2363
4.52 yr (1,652 days)
3.1598°
0° 13m 4.8s / day
Inclination 10.550°
82.972°
184.06°
Physical characteristics
Dimensions 10.920±0.122 km[3][4]
15.33 km (calculated)[5]
38.31±0.05 h[6]
0.057 (assumed)[5]
0.112±0.011[3][4]
C [5]
12.9[1] · 12.8[3][5] · 13.39±0.50[7]

    4585 Ainonai, provisional designation 1990 KQ, is a carbonaceous asteroid from the central region of the asteroid belt, approximately 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.[8] It was named for the town of Ainonai located near the discovering observatory.[2]

    Orbit and classification

    Ainonai orbits the Sun in the central main-belt at a distance of 2.1–3.4 AU once every 4 years and 6 months (1,652 days). Its orbit has an eccentricity of 0.24 and an inclination of 11° with respect to the ecliptic.[1]

    In 1972, it was first identified as 1972 LU at Crimea–Nauchnij, extending the body's observation arc by 18 years prior to its official discovery observation at Kitami.[8]

    Physical characteristics

    Ainonai has been characterized as a carbonaceous C-type asteroid.[5]

    Lightcurve

    A rotational lightcurve was obtained from photometric observation made at the Via Capote Observatory, California, in June 2008. It showed a longer than-average rotation period of 38.31±0.05 hours with a brightness amplitude of 0.30 in magnitude (U=3-)[6]

    Diameter and albedo

    According to observations from the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Ainonai has an albedo of 0.11 with a corresponding diameter of 10.9 kilometers.[3][4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 15.3 kilometers with an absolute magnitude of 12.8.[5]

    Naming

    This minor planet was 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] The official naming citation was published by the Minor Planet Center on 21 November 1991 (M.P.C. 19338).[9]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 4585 Ainonai (1990 KQ)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2017.
    2. 1 2 3 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 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. Bibcode:2011ApJ...741...90M. arXiv:1109.6407 Freely accessible. doi:10.1088/0004-637X/741/2/90. Retrieved 3 May 2016.
    4. 1 2 3 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. Bibcode:2011ApJ...741...68M. arXiv:1109.4096 Freely accessible. doi:10.1088/0004-637X/741/2/68. Retrieved 5 December 2016.
    5. 1 2 3 4 5 6 "LCDB Data for (4585) Ainonai". Asteroid Lightcurve Database (LCDB). Retrieved 3 May 2016.
    6. 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.
    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. Bibcode:2015Icar..261...34V. arXiv:1506.00762 Freely accessible. doi:10.1016/j.icarus.2015.08.007. Retrieved 3 May 2016.
    8. 1 2 "4585 Ainonai (1990 KQ)". Minor Planet Center. Retrieved 3 May 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 May 2016.
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