9844 Otani

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9844 Otani
Discovery [1]
Discovered by Y. Kushida
O. Muramatsu
Discovery site Yatsugatake South Base Observatory
Discovery date 23 November 1989
MPC designation 9844 Otani
Named after
Toyokazu Otani
(astronomy lecturer)[2]
1989 WF1 · 1980 VF1
1996 HA26
main-belt · Eunomia[3]
Orbital characteristics[1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 65.97 yr (24,097 days)
Aphelion 3.2900 AU
Perihelion 2.1091 AU
2.6996 AU
Eccentricity 0.2187
4.44 yr (1,620 days)
Inclination 12.930°
Physical characteristics
Dimensions 3.84 km (calculated)[3]
10.073±0.0053 h[4]
0.21 (assumed)[3]

9844 Otani, provisional designation 1989 WF1, is a stony asteroid from the middle region of the asteroid belt, about 3.8 kilometers in diameter. It was discovered on 23 November 1989, by Japanese astronomers Yoshio Kushida and Osamu Muramatsu at the Yatsugatake South Base Observatory, Hokuto, near the Greater Tokyo Area, Japan.[5]

The asteroid is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.1–3.3 AU once every 4 years and 5 months (1,620 days). Its orbit shows an eccentricity of 0.22 and an inclination of 13 degrees from the plane of the ecliptic.[1]

A photometric light-curve analysis at the Palomar Transient Factory in 2012 gave a rotation period of 10.073±0.0053 hours with a brightness amplitude of 0.18 in magnitude.[4] The Collaborative Asteroid Lightcurve Link (CALL) assumes a typical albedo for stony asteroids of 0.21 and calculates a diameter of 3.84 kilometers based on an absolute magnitude of 14.39.[3]

The minor planet was named in honor of Toyokazu Otani (b. 1928), who worked as a lecturer at the Gotoh Planetarium and Astronomical Museum in Tokyo for 32 years until 1988. Otani is also known as an eminent observer of the planets.[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 9844 Otani (1989 WF1)" (2015-11-10 last obs.). Jet Propulsion Laboratory. Retrieved January 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (9844) Otani. Springer Berlin Heidelberg. p. 711. ISBN 978-3-540-00238-3. Retrieved January 2016. 
  3. ^ a b c d e f "LCDB Data for (9844) Otani". Asteroid Lightcurve Database (LCDB). Retrieved January 2016. 
  4. ^ a b 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. Retrieved January 2016. 
  5. ^ "9844 Otani (1989 WF1)". Minor Planet Center. Retrieved January 2016. 

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