31179 Gongju
| Discovery [1] | |
|---|---|
| Discovered by | N. Sato |
| Discovery site | Chichibu Obs. |
| Discovery date | 21 December 1997 |
| Designations | |
| MPC designation | 31179 Gongju |
Named after |
Gongju (South Korean city)[2] |
|
1997 YR2 · 1989 TM9 1999 CS56 | |
| main-belt · Nysa [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 25.85 yr (9,442 days) |
| Aphelion | 2.9122 AU |
| Perihelion | 1.9738 AU |
| 2.4430 AU | |
| Eccentricity | 0.1920 |
| 3.82 yr (1,395 days) | |
| 294.06° | |
| Inclination | 3.4525° |
| 81.307° | |
| 248.40° | |
| Physical characteristics | |
| Dimensions |
4.675±0.152 km[4] 5.28 km (calculated)[3] |
| 4.829±0.001 h[5] | |
|
0.3528±0.0280[4] 0.21 (assumed)[3] | |
| S [3] | |
| 13.7[1] | |
|
| |
31179 Gongju, provisional designation 1997 YR2, is a stony asteroid from the inner regions of the asteroid belt, about 5 kilometers in diameter. It was discovered by Japanese amateur astronomer Naoto Sato at Chichibu Observatory near Tokyo, central Japan, on 21 December 1997.[6]
The S-type asteroid is a member of the stony subgroup of the Nysa family, one of the smaller families in the main-belt, named after its namesake, 44 Nysa. The body orbits the Sun at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,395 days). Its orbit shows an eccentricity of 0.19 and is tilted by 3 degrees to the plane of the ecliptic.[1] In 2012, a light-curve analysis at the Shadowbox Observatory in Carmel, Indiana, rendered a rotation period of 4.829±0.001 hours with an estimated amplitude of 0.80 in magnitude.[5] It has an albedo of 0.35, according to the survey carried out by the Wide-field Infrared Survey Explorer with its NEOWISE mission,[4] while the Collaborative Asteroid Lightcurve Link assumes a somewhat lower albedo of 0.21, a typical value for stony asteroids.[3]
The minor planet was named after the South Korean city of Gongju, located in Chungcheongnam-do Province. It has a population of approximately 120,000 and was the capital of Baekje dynasty in the 5th century AD and the seat of the provincial government until 1932.[2]
References
- 1 2 3 4 "JPL Small-Body Database Browser: 31179 Gongju (1997 YR2)" (2015-08-14 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
- 1 2 Schmadel, Lutz D. (2015). Dictionary of Minor Planet Names Addendum 2012–2014 – (31179) Gongju (PDF). Springer Berlin Heidelberg. p. 179. doi:10.1007/978-3-319-17677-2_2. Retrieved January 2016.
- 1 2 3 4 5 "LCDB Data for (31179) Gongju". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
- 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved January 2016.
- 1 2 Ruthroff, John C. (April 2013). "Lightcurve Analysis of Main Belt Asteroids 1115 Sabauda 1554 Yugoslavia, 1616 Filipoff, 2890 Vilyujsk, (5153) 1940 GO, and (31179) 1997 YR2". The Minor Planet Bulletin 40 (2): 90–91. Bibcode:2013MPBu...40...90R. ISSN 1052-8091. Retrieved January 2016.
- ↑ "31179 Gongju (1997 YR2)". Minor Planet Center. Retrieved January 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 (30001)-(35000) – Minor Planet Center
- 31179 Gongju at the JPL Small-Body Database
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