Discovery[1][2][3] | |
---|---|
Discovered by | Spacewatch |
Discovery site | Kitt Peak Obs. |
Discovery date | 18 January 1991 |
Designations | |
1991 BA | |
Apollo · NEO | |
Orbital characteristics[1] | |
Epoch 18 January 1991 (JD 2448274.5) | |
Uncertainty parameter 9 | |
Observation arc | 4.6 hours[4] |
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[5][4] |
28.6[1] | |
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.[2][3] 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.[6]
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