2017 SX17
2017 SX17 is a very small asteroid, classified as a near-Earth object of the Apollo group, approximately 6–12 meters (20–40 feet) in diameter. It was first observed by astronomers of the Mount Lemmon Survey at Mount Lemmon Observatory on 29 September 2017, three days prior to its sub-lunar close encounter with Earth at 0.23 lunar distances on 2 October 2017.
| Discovery | |
|---|---|
| Discovered by | Mount Lemmon Srvy. |
| Discovery site | Mount Lemon Obs. |
| Discovery date | 29 September 2017 |
| Designations | |
MPC designation | 2017 SX17 |
Minor planet category | NEO · Apollo |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 5 | |
| Observation arc | 8 days |
| Aphelion | 1.4625 AU |
| Perihelion | 0.8673 AU |
Semi-major axis | 1.1649 AU |
| Eccentricity | 0.2555 |
Orbital period (sidereal) | 1.26 yr (459 d) |
Mean anomaly | 90.265° |
Mean motion | 0° 47m 2.4s / day |
| Inclination | 2.8675° |
Longitude of ascending node | 189.81° |
| 249.11° | |
| Earth MOID | 0.00082 AU (0.32 LD) |
| Physical characteristics | |
Mean diameter | 6 m (est. at 0.24) 8 m (estimate) 12 m (est. at 0.057) |
| 28.3 | |
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