1512 Oulu
| Discovery [1] | |
|---|---|
| Discovered by | H. Alikoski |
| Discovery site | Turku Observatory |
| Discovery date | 18 March 1939 |
| Designations | |
| MPC designation | 1512 Oulu |
|
Named after
|
Oulu (Finnish town)[2] |
| 1939 FE · 1938 CU 1957 TA · 1958 XS |
|
| main-belt (outer) · Hilda [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 76.61 yr (27,981 days) |
| Aphelion | 4.5405 AU |
| Perihelion | 3.3663 AU |
| 3.9534 AU | |
| Eccentricity | 0.1485 |
| 7.86 yr (2,871 days) | |
| 231.90° | |
| Inclination | 6.4898° |
| 10.206° | |
| 240.40° | |
| Physical characteristics | |
| Dimensions | 82.72±2.5 km (IRAS:38)[4] 65.0 km[5] 91.05±2.20 km[6] 65.000±4.137 km[7] |
| 132.3 h[8] | |
| 0.0366±0.002 (IRAS:38)[4] 0.0594[5] 0.06±0.03[9] 0.031±0.001[6] 0.0536±0.0061[7] |
|
| B–V = 0.715 U–B = 0.190 Tholen = P P [3] |
|
| 9.62[1] | |
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1512 Oulu, provisional designation 1939 FE, is a rare-type Hildian asteroid and slow rotator from the outermost region of the asteroid belt. With a diameter of about 80 kilometers, it belongs to the fifty largest asteroids in the outer main-belt. The body was discovered on 18 March 1939, by Finnish astronomer Heikki Alikoski at Turku Observatory in Southwest Finland.[10]
The dark and reddish asteroid classifies as a P-type asteroid in the Tholen taxonomy, of which only a few dozens bodies are currently known.[11] It orbits the Sun at a distance of 3.4–4.5 AU once every 7 years and 10 months (2,871 days). Its orbit shows an eccentricity of 0.15 and is tilted by 6 degrees to the plane of the ecliptic. It is a slow rotator with a long rotation period of 132.3 hours.[8] Its low albedo lies in the range of 0.03 to 0.06, according to the surveys carried out by IRAS, Akari, and WISE/NEOWISE, as well as one observation using stellar occultation to determine its albedo (occultation albedo).[4][5][6][7][9]
Located in the outermost part of the main-belt, the asteroid is a member of the Hilda family, a large group of asteroids that are thought to have originated from the Kuiper belt. They orbit in a 3:2 orbital resonance with the gas giant Jupiter, meaning that for every 2 orbits Jupiter completes around the Sun, a Hildian asteroid will complete 3 orbits.[1] The asteroid's orbit does not cross the path of any of the planets and therefore it will not be pulled out of orbit by Jupiter's gravitational field. As a result of this, it is likely that the asteroid will remain in a stable orbit for thousands of years.
It was named after the northern Finnish town Oulu, the birthplace of the discoverer.[2]
References
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<references />, or <references group="..." />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 (1)-(5000) – Minor Planet Center
- 1512 Oulu at the JPL Small-Body Database
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