5692 Shirao
| Discovery [1] | |
|---|---|
| Discovered by | K. Endate K. Watanabe |
| Discovery site | Kitami Obs. |
| Discovery date | 23 March 1992 |
| Designations | |
| 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[a] 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)[a]. 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
- ^ a b 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)
- ^ a b c d "JPL Small-Body Database Browser: 5692 Shirao (1992 FR)" (2016-01-31 last obs.). Jet Propulsion Laboratory. Retrieved 11 July 2016.
- ^ a b 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.
- ^ a b c d e f g "LCDB Data for (5692) Shirao". Asteroid Lightcurve Database (LCDB). Retrieved 11 July 2016.
- ^ a b c d 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 11 July 2016.
- ^ a b c d 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 11 July 2016.
- ^ a b 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.
- ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (5692) Shirao". Geneva Observatory. Retrieved 11 July 2016.
- ^ a b 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 11 July 2016.
- ^ a b "5692 Shirao (1992 FR)". Minor Planet Center. Retrieved 11 July 2016.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 11 July 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 5692 Shirao at the JPL Small-Body Database
