5692 Shirao

5692 Shirao
Discovery [1]
Discovered by K. Endate
K. Watanabe
Discovery site Kitami Obs.
Discovery date 23 March 1992
Designations
MPC designation 5692 Shirao
Named after
 Motomaro Shirao
(geologist, photographer)[2]
1992 FR · 1949 KK
1966 FO · 1966 FS
1970 CH · 1976 SN2
1979 HT2 · 1979 HV1
1985 UW2 · 1989 SO9
main-belt · Eunomia [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 66.67 yr (24,353 days)   
Aphelion 3.1374 AU
Perihelion 2.1735 AU
2.6554 AU
Eccentricity 0.1815
4.33 yr (1,581 days)
196.05°
0° 13m 40.08s / day
Inclination 11.931°
181.79°
44.197°
Physical characteristics
Dimensions 9.17 km (calculated)[3]
9.75±0.30 km[4]
9.811±0.063 km[5]
2.886±0.002 h[6]
2.8878±0.0004 h[lower-alpha 1]
2.90±0.01 h (i)[7]
2.90±0.02 h (ii)[7]
0.21 (assumed)[3]
0.2218±0.0290[5]
0.223±0.030[4]
S [3][8]
12.3[5][4]
12.47±0.25[8]
12.5[1][3]

    5692 Shirao, provisional designation 1992 FR, is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 23 March 1992, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory, Hokkaidō, Japan.[9]

    The asteroid is a member of the Eunomia family, a large group of stony S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.2–3.1 AU once every 4 years and 4 months (1,581 days). Its orbit has an eccentricity of 0.18 and an inclination of 12° with respect to the ecliptic.[1] The first used precovery was taken at the U.S. Palomar Observatory in 1955, extending the asteroid's observation arc by 37 years prior to its discovery.[9]

    In June 2014, a rotational light-curve for this asteroid was obtained from photometric observations made by American astronomer Brian D. Warner at the U.S. Palmer Divide Observatory in Colorado. It gave a well-defined rotation period of 2.8878±0.0004 hours with a brightness variation of 0.16 in magnitude (U=3)[lower-alpha 1]. Previous light-curves were obtained by French astronomer René Roy (2.90±0.01 hours, Δ 0.13 mag, U=2) in June 2001,[7] by American astronomer Donald P. Pray (2.886±0.002 hours, Δ 0.12 mag, U=2) in March 2005,[6] and by astronomers Dominique Suys, Hugo Riemis and Jan Vantomme (2.90±0.01 hours, Δ 0.15 mag, U=2+) in September 2006.[3][7]

    According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, the asteroid measures 9.8 kilometers in diameter and its surface has an albedo of 0.22,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo of 0.21 – derived from 15 Eunomia, the largest member and namesake of this asteroid family – and calculates a diameter of 9.2 kilometers.[3]

    The minor planet was named after Japanese geologist and astrophotographer Motomaro Shirao (b. 1953), who is known for his photographs of volcanoes and lunar geological features.[2] Naming citation was published on 4 April 1996 (M.P.C. 26930).[10]

    References

    1. 1 2 Warner (2014l) web: rotation period 2.8878±0.0004 hours with a brightness amplitude of 0.16 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (5692) Shirao and (2014MPBu...41..235P)
    1. 1 2 3 4 "JPL Small-Body Database Browser: 5692 Shirao (1992 FR)" (2016-01-31 last obs.). Jet Propulsion Laboratory. Retrieved 11 July 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (5692) Shirao. Springer Berlin Heidelberg. p. 482. ISBN 978-3-540-00238-3. Retrieved 11 July 2016.
    3. 1 2 3 4 5 6 7 "LCDB Data for (5692) Shirao". Asteroid Lightcurve Database (LCDB). Retrieved 11 July 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 11 July 2016.
    5. 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 11 July 2016.
    6. 1 2 Pray, Donald P. (September 2005). "Lightcurve analysis of asteroids 106, 752, 847, 1057, 1630, 1670, 1927 1936, 2426, 2612, 2647, 4087, 5635, 5692, and 6235". The Minor Planet Bulletin. 32 (3): 48–51. Bibcode:2005MPBu...32...48P. ISSN 1052-8091. Retrieved 11 July 2016.
    7. 1 2 3 4 Behrend, Raoul. "Asteroids and comets rotation curves – (5692) Shirao". Geneva Observatory. Retrieved 11 July 2016.
    8. 1 2 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 11 July 2016.
    9. 1 2 "5692 Shirao (1992 FR)". Minor Planet Center. Retrieved 11 July 2016.
    10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 11 July 2016.

    External links

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