2014 AA
2014 AA was a small Apollo near-Earth asteroid roughly 2–4 meters in diameter that struck Earth on 2 January 2014. It was discovered on 1 January 2014 by Richard Kowalski at the Mount Lemmon Survey at an apparent magnitude of 19 using a 1.52-meter (60 in) reflecting telescope at Mount Lemmon Observatory. 2014 AA was only observed over a short observation arc of about 70 minutes, and entered Earth's atmosphere about 21 hours after discovery. Nonetheless, it remains one of only a few asteroids observed before impact (see Asteroid impact prediction).
2014 AA imaged by the Catalina Sky Survey in January 2014. The asteroid was around one lunar distance from Earth at that time. | |
| Discovery | |
|---|---|
| Discovered by | Richard Kowalski Mount Lemmon Survey (G96) |
| Discovery date | 1 January 2014 |
| Designations | |
MPC designation | 2014 AA |
Minor planet category |
|
| Orbital characteristics | |
| Epoch 1 January 2014 (JD 2456658.5) | |
| Uncertainty parameter 9 | |
| Observation arc | ~70 minutes |
| Aphelion | 1.4080 AU (210.63 Gm) (Q) |
| Perihelion | 0.9163 AU (137.08 Gm) (q) |
Semi-major axis | 1.1623 AU (173.88 Gm) (a) |
| Eccentricity | 0.2116 (e) |
Orbital period (sidereal) | 1.25 yr (457.26 d) |
Mean anomaly | 324.1460° (M) |
Mean motion | 0° 47m 14.244s / day (n) |
| Inclination | 1.4156° (i) |
Longitude of ascending node | 101.6086° (Ω) |
| 15 February 2014 (would have been) | |
| 52.3393° (ω) | |
| Earth MOID | 4.54412×10−7 AU (67.9791 km) |
| Jupiter MOID | 3.58092 AU (535.698 Gm) |
| Physical characteristics | |
| Dimensions | ~3 meters (10 ft) |
| Mass | ~4×104 kg (assumed) |
| 30.9 | |
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