1091 Spiraea
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 26 February 1928 |
| Designations | |
| (1091) Spiraea | |
| Pronunciation | /spaɪˈriːə/ |
Named after | Spiraea (genus of shrubs) |
| 1928 DT · 1934 CN1 1938 UR · 1964 XH | |
| main-belt · (outer) Cybele · background | |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 89.27 yr (32,606 days) |
| Aphelion | 3.6484 AU |
| Perihelion | 3.2077 AU |
| 3.4281 AU | |
| Eccentricity | 0.0643 |
| 6.35 yr (2,318 days) | |
| 110.37° | |
| 0° 9m 19.08s / day | |
| Inclination | 1.1554° |
| 80.790° | |
| 12.062° | |
| Physical characteristics | |
| Dimensions | 32.78 km (calculated) 35.178±0.108 km 39.92±17.85 km 40.280±0.455 km 40.52±0.91 km |
| 7.01±0.43 h | |
| 0.05±0.06 0.057 (assumed) 0.0627±0.0106 0.063±0.003 0.091±0.025 | |
| C (assumed) | |
| 10.60 · 10.70±0.08 (R) · 10.8 · 11.00±0.14 · 11.15 · 11.18 | |
1091 Spiraea, provisional designation 1928 DT, is a carbonaceous Cybele asteroid from the outer regions of the asteroid belt, approximately 36 kilometers in diameter. It was discovered on 26 February 1928, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after Spiraea, a genus of plants.