(85182) 1991 AQ
(85182) 1991 AQ (provisional designation 1991 AQ) is a stony asteroid on a highly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.1 kilometers (0.7 miles) in diameter. It was discovered on 14 January 1991, by American astronomer Eleanor Helin at the Palomar Observatory in California. Based on its brightness variation of 0.69 magnitude, this Q-type asteroid is likely elongated. It belongs to the small group of potentially hazardous asteroids larger than one kilometer.
| Discovery | |
|---|---|
| Discovered by | E. F. Helin |
| Discovery site | Palomar Obs. |
| Discovery date | 14 January 1991 |
| Designations | |
MPC designation | (85182) 1991 AQ |
Alternative designations | 1991 AQ · 1994 RD |
Minor planet category | Apollo · NEO · PHA |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 26.91 yr (9,829 d) |
| Aphelion | 3.9474 AU |
| Perihelion | 0.4960 AU |
Semi-major axis | 2.2217 AU |
| Eccentricity | 0.7768 |
Orbital period (sidereal) | 3.31 yr (1,210 d) |
Mean anomaly | 64.916° |
Mean motion | 0° 17m 51.36s / day |
| Inclination | 3.1276° |
Longitude of ascending node | 339.68° |
| 242.96° | |
| Earth MOID | 0.0165 AU (6.428 LD) |
| Physical characteristics | |
Mean diameter | 1.1 km 1.14 km (derived) |
| 0.18 (assumed) 0.242±0.194 | |
| Q (Tholen) | |
| 17.1 17.20 | |
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