1991 BA
1991 BA is a sub-kilometer asteroid, classified as near-Earth object of the Apollo group that was first observed by Spacewatch on 18 January 1991, and passed within 160,000 km (100,000 mi) of Earth. This is a little less than half the distance to the Moon. With a 5-hour observation arc the asteroid has a poorly constrained orbit and is considered lost. It could be a member of the Beta Taurids.
| Discovery | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak Obs. |
| Discovery date | 18 January 1991 |
| Designations | |
MPC designation | 1991 BA |
Minor planet category | Apollo · NEO |
| Orbital characteristics | |
| Epoch 18 January 1991 (JD 2448274.5) | |
| Uncertainty parameter 9 | |
| Observation arc | 4.6 hours |
| Aphelion | 3.662±0.430 AU |
| Perihelion | 0.7153±0.0122 AU |
Semi-major axis | 2.189±0.257 AU |
| Eccentricity | 0.6732±0.0440 |
Orbital period (sidereal) | 3.24±0.57 yr (1,183±208 days) |
Mean anomaly | 346.836°±2.609° |
Mean motion | 0° 18m 15.655s / day |
| Inclination | 1.938°±0.104° |
Longitude of ascending node | 118.880°±0.012° |
| 70.688°±0.260° | |
| Earth MOID | 0.0003 AU · 0.1 LD |
| Physical characteristics | |
| Dimensions | 5–10 m |
| 28.6 | |
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