(505657) 2014 SR339
(505657) 2014 SR339, provisional designation 2014 SR339, is a dark and elongated asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 970 meters (3,200 feet) in diameter. It was discovered on 30 September 2014, by NASA's Wide-field Infrared Survey Explorer telescope (WISE) in Earth's orbit. Closely observed at Goldstone and Arecibo in February 2018, it has a rotation period of 8.7 hours.
Radar images of 2014 SR339 taken by the Arecibo Observatory on 9 February 2018 | |
| Discovery | |
|---|---|
| Discovered by | WISE |
| Discovery site | Earth orbit |
| Discovery date | 30 September 2014 |
| Designations | |
MPC designation | (505657) 2014 SR339 |
Alternative designations | 2014 SR339 |
Minor planet category | Apollo · NEO · PHA |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 3.41 yr (1,245 d) |
| Aphelion | 1.6948 AU |
| Perihelion | 0.9046 AU |
Semi-major axis | 1.2997 AU |
| Eccentricity | 0.3040 |
Orbital period (sidereal) | 1.48 yr (541 d) |
Mean anomaly | 60.524° |
Mean motion | 0° 39m 54.72s / day |
| Inclination | 29.790° |
Longitude of ascending node | 138.78° |
| 299.60° | |
| Earth MOID | 0.0354 AU (13.8 LD) |
| Physical characteristics | |
| Dimensions | (>1.5 km × ? km) |
Mean diameter | 0.971±0.367 km |
Synodic rotation period | 8–9 h 8.729 h |
| 0.068±0.074 | |
| C(assumed on albeo) | |
| 18.6 | |
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