4263 Abashiri

4263 Abashiri
Discovery [1]
Discovered by M. Yanai
K. Watanabe
Discovery site Kitami Obs.
Discovery date 7 September 1989
Designations
MPC designation 4263 Abashiri
Named after
 Abashiri
(Japanese city)[2]
1989 RL2 · 1935 KE
1952 OS · 1969 TS3
1972 OB · 1978 EK
1981 AT1 · 1982 PF
1988 DK5
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 64.57 yr (23,586 days)
Aphelion 2.5444 AU
Perihelion 1.9260 AU
2.2352 AU
Eccentricity 0.1383
3.34 yr (1,221 days)
111.19°
0° 17m 41.64s / day
Inclination 5.8050°
298.08°
307.62°
Physical characteristics
Dimensions 8.98±0.44 km[4]
7.17 km (derived)[3]
4.8820±0.0002 h[lower-alpha 1]
4.8817±0.0001 h[lower-alpha 1]
0.200±0.033[4]
0.24 (assumed)[3]
S [3]
12.7[1]
12.93[3]
12.60[4]
12.44±0.08 (R)[lower-alpha 1]
12.93±0.094[5]

    4263 Abashiri, provisional designation 1989 RL2, is a stony Flora asteroid from the inner regions of the asteroid belt, about 8 kilometers in diameter. It was discovered on 7 September 1989, by Japanese astronomers Masayuki Yanai and Kazuro Watanabe at Kitami Observatory in eastern Hokkaidō, Japan.[6]

    The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,220 days). Its orbit has an eccentricity of 0.14 and an inclination of 6° with respect to the ecliptic.[1] Due to a precovery obtained at Palomar Observatory in 1951, the asteroid's observation arc could be extended by 38 years prior to its discovery.[6]

    In 2008 and 2011, two rotational light-curves obtained by Czech astronomer Petr Pravec gave a well-defined rotation period of 4.8820±0.0002 and 4.8817±0.0001 hours with a corresponding brightness variation of 0.15 and 0.11 in magnitude, respectively (U=3/3).[lower-alpha 1] According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 9.0 kilometers in diameter and its surface has an albedo of 0.20,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24, derived from the Flora family's largest member and namesake, the asteroid 8 Flora, and calculates a somewhat smaller diameter of 7.2 kilometers.[3]

    The minor planet was named for the Japanese city of Abashiri, known for its fishing industry. It is located at the Sea of Okhotsk, about 50 kilometers east of Kitami, in the eastern part of the island of Hokkaidō. The minor planets, 3720 Hokkaido and 3785 Kitami are named after the island and city, respectively.[2] Naming citation was published on 21 November 1991 (M.P.C. 19336).[7]

    References

    1. 1 2 3 4 Pravec (2008) web: rotation period 4.8820±0.0002 hours with a brightness amplitude of 0.15 mag, and Pravec (2012) web: rotation period 4.8817±0.0001 hours with a brightness amplitude of 0.11 mag. Both observations are denoted as a secure results (within the precision given and no ambiguity, U=3) by the Collaborative Asteroid Lightcurve Link (CALL). Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (4263) Abashiri
    1. 1 2 3 4 "JPL Small-Body Database Browser: 4263 Abashiri (1989 RL2)" (2015-09-02 last obs.). Jet Propulsion Laboratory. Retrieved 26 April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (4263) Abashiri. Springer Berlin Heidelberg. p. 365. ISBN 978-3-540-00238-3. Retrieved 26 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (4263) Abashiri". Asteroid Lightcurve Database (LCDB). Retrieved 26 April 2016.
    4. 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 14 January 2016.
    5. ↑ Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 26 April 2016.
    6. 1 2 "4263 Abashiri (1989 RL2)". Minor Planet Center. Retrieved 26 April 2016.
    7. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 April 2016.

    External links

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