9844 Otani

9844 Otani
Discovery [1]
Discovered by Y. Kushida
O. Muramatsu
Discovery site Yatsugatake South Base Obs.
Discovery date 23 November 1989
Designations
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 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 66.97 yr (24,461 days)
Aphelion 3.2886 AU
Perihelion 2.1095 AU
2.6990 AU
Eccentricity 0.2184
4.43 yr (1,620 days)
58.420°
0° 13m 20.28s / day
Inclination 12.931°
60.742°
353.04°
Physical characteristics
Dimensions 3.84 km (calculated)[3]
10.0730±0.0053 h[4]
0.21 (assumed)[3]
S [3]
13.87±0.47[5] · 13.9[1]
13.939±0.004 (R)[4] · 14.39[3]

    9844 Otani, provisional designation 1989 WF1, is a stony Eunomian asteroid from the middle region of the asteroid belt, approximately 4 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.[6]

    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 has an eccentricity of 0.22 and an inclination of 13° with respect to the ecliptic.[1] The first used observation was a precovery taken at Palomar Mountain in 1949, which extended the asteroid's observation arc by 40 years prior to its official discovery observation.[6]

    A rotational light-curve for this asteroid was obtained from photometric observations at the Palomar Transient Factory in February 2013. It gave a rotation period of 10.073±0.0053 hours with a brightness variation of 0.18 in magnitude (U=2).[4] The Collaborative Asteroid Lightcurve Link assumes an albedo 0.21 – derived from 15 Eunomia, the family's largest member and namesake – 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), a renowned observer of minor planets, lecturer at the Gotoh Planetarium, and long-time employee at the Astronomical Museum in Tokyo (1956–1988).[2] Naming citation was published on 2 April 1999 (M.P.C. 34355).[7]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 9844 Otani (1989 WF1)" (2016-11-08 last obs.). Jet Propulsion Laboratory. Retrieved 4 December 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (9844) Otani. Springer Berlin Heidelberg. p. 711. ISBN 978-3-540-00238-3. Retrieved 1 August 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (9844) Otani". Asteroid Lightcurve Database (LCDB). Retrieved 1 August 2016.
    4. 1 2 3 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:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 1 January 2016.
    5. ↑ 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 1 August 2016.
    6. 1 2 "9844 Otani (1989 WF1)". Minor Planet Center. Retrieved 1 August 2016.
    7. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 August 2016.

    External links

    This article is issued from Wikipedia - version of the 12/4/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.