1241 Dysona
1241 Dysona, provisional designation 1932 EB1, is a dark background asteroid from the outer regions of the asteroid belt, approximately 77 kilometers in diameter. It was discovered on 4 March 1932, by English astronomer Harry Edwin Wood at the Union Observatory in Johannesburg, South Africa. The asteroid was named after English astronomer Frank Watson Dyson.
Lightcurve-based 3D-model of Dysona | |
| Discovery | |
|---|---|
| Discovered by | H. E. Wood |
| Discovery site | Johannesburg Obs. |
| Discovery date | 4 March 1932 |
| Designations | |
MPC designation | (1241) Dysona |
Named after | Frank Watson Dyson (English astronomer) |
Alternative designations | 1932 EB1 · 1931 AA1 1945 RA · 1948 CE 1956 PB · A908 DC A920 EB |
Minor planet category | main-belt · (outer) background |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 97.31 yr (35,542 days) |
| Aphelion | 3.5165 AU |
| Perihelion | 2.8633 AU |
Semi-major axis | 3.1899 AU |
| Eccentricity | 0.1024 |
Orbital period (sidereal) | 5.70 yr (2,081 days) |
Mean anomaly | 290.13° |
Mean motion | 0° 10m 22.8s / day |
| Inclination | 23.518° |
Longitude of ascending node | 322.27° |
| 320.07° | |
| Physical characteristics | |
| Dimensions | 70.757±0.287 km 74.83±28.44 km 75.62±0.82 km 77.14±0.86 km 77.47±26.72 km 79.190±0.694 km 83.05±4.4 km |
Synodic rotation period | 8.355±0.001 h 8.60738 h 8.6080±0.0005 h |
| 0.04±0.05 0.0425±0.005 0.047±0.003 0.05±0.05 0.051±0.001 0.051±0.005 0.0585±0.0120 | |
| Tholen = PDC B–V = 0.750 U–B = 0.290 | |
| 9.45 · 9.74 | |
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