1580 Betulia
1580 Betulia, provisional designation 1950 KA, is an eccentric, carbonaceous asteroid, classified as near-Earth object of the Amor group, approximately 4.2 kilometers in diameter. It was discovered on 22 May 1950, by South African astronomer Ernest Johnson at the Union Observatory in Johannesburg. The asteroid was named for Betulia Toro, wife of astronomer Samuel Herrick.
Lightcurve-based 3D-model of Betulia | |
| Discovery | |
|---|---|
| Discovered by | E. L. Johnson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 22 May 1950 |
| Designations | |
MPC designation | (1580) Betulia |
| Pronunciation | /bɛˈtjuːliə/ |
Named after | Betulia Toro Herrick (wife of astronomer S. Herrick) |
Alternative designations | 1950 KA |
Minor planet category | NEO · Amor |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 66.64 yr (24,342 days) |
| Aphelion | 3.2684 AU |
| Perihelion | 1.1258 AU |
Semi-major axis | 2.1971 AU |
| Eccentricity | 0.4876 |
Orbital period (sidereal) | 3.26 yr (1,190 days) |
Mean anomaly | 252.41° |
Mean motion | 0° 18m 9.36s / day |
| Inclination | 52.096° |
Longitude of ascending node | 62.291° |
| 159.50° | |
| Earth MOID | 0.1365 AU · 53.2 LD |
| Physical characteristics | |
| Dimensions | 3.82 km 3.9 km 4.2 km (CALL-LCDB) 4.57 km 5.37±0.04 km 5.39±0.54 km 5.8 km (Gehrels 1994) 8.55±5.23 km |
Synodic rotation period | 6.130 h 6.1324±0.0002 h 6.134 h 6.135±0.005 h 6.13836 h 6.156 h 6.48 h |
| 0.04±0.08 0.05 0.07±0.01 0.077 0.08 (Gehrels 1994) 0.09 (CALL-LCDB) 0.11 0.17 | |
| Tholen = C · B B–V = 0.656 U–B = 0.249 | |
| 14.00 · 14.5 · 14.53 · 14.58 · 14.8 · 14.8±0.3 · 14.90 · 15.1 | |
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