1529 Oterma
| Discovery | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 26 January 1938 |
| Designations | |
| MPC designation | 1529 Oterma |
|
Named after
|
Liisi Oterma (astronomer) |
| 1938 BC · 1950 PV 1959 RD1 · A912 VO |
|
| main-belt · Hilda | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 66.38 yr (24,246 days) |
| Aphelion | 4.7952 AU |
| Perihelion | 3.1919 AU |
| 3.9936 AU | |
| Eccentricity | 0.2007 |
| 7.98 yr (2,915 days) | |
| 25.738° | |
| 0° 7m 24.6s / day | |
| Inclination | 9.0573° |
| 100.60° | |
| 295.14° | |
| Jupiter MOID | 0.8105 AU |
| Physical characteristics | |
| Dimensions | 54.40 km (calculated) 56.327±0.285 60.16±1.11 km |
| 15.75 h | |
|
0.047±0.002 0.054±0.003 0.057 (assumed) |
|
|
B–V = 0.764 U–B = 0.386 Tholen = P · P |
|
| 10.05 · 10.11±0.26 | |
1529 Oterma, provisional designation 1938 BC, is a reddish, rare-type Hildian asteroid from the outermost region of the asteroid belt, approximately 56 kilometers in diameter. It was discovered on 26 January 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. It is named for Liisi Oterma.
The carbonaceous body belongs to an exclusive group of 33 known asteroids with a spectral P-type in the Tholen classification scheme. It is a member of the Hilda family, a large group of asteroids that orbit in resonance with the gas giant Jupiter. Hildian asteroids are thought to have originated from the Kuiper belt in the outer Solar System.
It orbits the Sun at a distance of 3.2–4.8 AU once every 7 years and 12 months (2,915 days). Its orbit has an eccentricity of 0.20 and an inclination of 9° with respect to the ecliptic.Oterma was first identified as A912 VO at Winchester Observatory in 1912 (799). The body's observation arc begins at Turku a few weeks after its official discovery observation.
During a study of 47 Hilda asteroids in the 1990s, a rotational light-curve of Oterma was obtained from photometric observations at the Swedish Uppsala Astronomical Observatory and other places. It gave a rotation period of 15.75 hours with a change in brightness of 0.18 magnitude (U=2).
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