1389 Onnie
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Light-curve-based 3D-model of 1389 Onnie
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| Discovery [1] | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site | Johannesburg Obs. (Leiden Southern Station) |
| Discovery date | 28 September 1935 |
| Designations | |
| MPC designation | 1389 Onnie |
|
Named after
|
A. Kruyt (relative of orbit computer)[2] |
| 1935 SS1 · 1949 QV1 1955 XB1 |
|
| main-belt · Koronis [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 79.84 yr (29,163 days) |
| Aphelion | 2.9139 AU |
| Perihelion | 2.8192 AU |
| 2.8666 AU | |
| Eccentricity | 0.0165 |
| 4.85 yr (1,773 days) | |
| 58.913° | |
| Inclination | 2.0472° |
| 174.56° | |
| 299.95° | |
| Physical characteristics | |
| Dimensions | 14.737±0.159 km[4] 12.46 km (derived)[3] |
| 22.5 h[5] 23.0447±0.0005 h[6] |
|
| 0.1734±0.0387[4] 0.24 (assumed)[3] |
|
| B–V = 0.810 S [3] |
|
| 11.64[1] | |
1389 Onnie, provisional designation 1935 SS1, is a stony asteroid from the outer region of the asteroid belt, about 13 kilometers in diameter. It was discovered by Dutch astronomer Hendrik van Gent at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa, on 28 September 1935.[7]
The S-type asteroid is a member of the Koronis family, a group consisting of about 200 known bodies. It orbits the Sun at a distance of 2.8–2.9 AU once every 4 years and 10 months (1,773 days). Its orbit is nearly circular with a very low eccentricity of 0.02 and almost coplanar to the plane of the ecliptic, tilted by only 2 degrees. It has a rather long rotation period of about 23 hours[5][6] and an albedo of 0.17, according to the survey carried out by the space-based Wide-field Infrared Survey Explorer and subsequent NEOWISE mission.[4] The Collaborative Asteroid Lightcurve Link (CALL) assumes as somewhat higher albedo of 0.24, which is more typical for a silicaceous asteroid.[3]
The minor planet was named after A. Kruyt, sister-in-law of astronomer G. Pels (1893–1966). Pels, who proposed the minor planet's name, was as a lifelong member of the Leiden Observatory's staff, observer of minor planets at Leiden, and orbit computer for many of the discoveries made by Hendrik van Gent.[2] The minor planet 1667 Pels was named in his honour.[8]
References
- ↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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
- 1389 Onnie at the JPL Small-Body Database
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