Back 1389 اونى (كويكب) ARZ (1389) Онни CE (1389) Onnie German 1389 Όνι Greek 1389 Onnie Esperanto (1389) Onnie Spanish 1389 Onnie Basque سیارک ۱۳۸۹ Persian (1389) Onnie French 1389 Onnie Hungarian
.png) Light-curve-based 3D-model of Onnie | |
| Discovery[1] | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site | Johannesburg Obs. (Leiden Southern Station) |
| Discovery date | 28 September 1935 |
| Designations | |
| (1389) Onnie | |
Named after | A. Kruyt (relative of G. Pels)[2] |
| 1935 SS1 · 1949 QV1 1955 XB1 | |
| main-belt · Koronis[3] | |
| Orbital characteristics[1] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 80.87 yr (29,539 days) |
| Aphelion | 2.9118 AU |
| Perihelion | 2.8183 AU |
| 2.8650 AU | |
| Eccentricity | 0.0163 |
| 4.85 yr (1,771 days) | |
| 183.28° | |
| 0° 12m 11.52s / day | |
| Inclination | 2.0480° |
| 174.57° | |
| 297.53° | |
| Physical characteristics | |
| Dimensions | 12.46 km (derived)[3] 13.772±0.184 km[4] 14.737±0.159 km[5] |
| 22.5 h[6] 23.0447±0.0005 h[7] | |
| 0.1734±0.0387[5] 0.198±0.016[4] 0.24 (assumed)[3] | |
| B–V = 0.810[1] LS[8] · S[3][6] | |
| 11.64[1] · 11.69[3][5][6] · 11.74±0.40[8] | |
1389 Onnie, provisional designation 1935 SS1, is a stony Koronian asteroid from the outer region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 28 September 1935, by Dutch astronomer Hendrik van Gent at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa.[9]
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