1991 BA
| Discovery | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak Obs. |
| Discovery date | 18 January 1991 |
| Designations | |
| 1991 BA | |
| 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 |
| 2.189±0.257 AU | |
| Eccentricity | 0.6732±0.0440 |
| 3.24±0.57 yr (1,183±208 days) | |
| 346.836°±2.609° | |
| 0° 18m 15.655s / day | |
| Inclination | 1.938°±0.104° |
| 118.880°±0.012° | |
| 70.688°±0.260° | |
| Earth MOID | 0.0003 AU · 0.1 LD |
| Physical characteristics | |
| Dimensions | 5–10 m |
| 28.6 | |
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 (99,000 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.