2015 SO2
2015 SO2 (also written 2015 SO2) is an Aten asteroid that is a temporary horseshoe companion to the Earth, the ninth known Earth horseshoe librator. Prior to its most recent close encounter with our planet (2015 September 30) it was an Apollo asteroid.
| Discovery | |
|---|---|
| Discovered by | Črni Vrh Obs. |
| Discovery date | 21 September 2015 |
| Designations | |
MPC designation | 2015 SO2 |
Minor planet category |
|
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 1 | |
| Observation arc | 342 days |
| Aphelion | 1.10688036 AU (165.586945 Gm) |
| Perihelion | 0.890962 AU (133.2860 Gm) |
Semi-major axis | 0.99892124 AU (149.436491 Gm) |
| Eccentricity | 0.108076 |
Orbital period (sidereal) | 1.00 yr (364.66602 d) |
Mean anomaly | 208.3767° |
Mean motion | 0° 59m 13.937s / day |
| Inclination | 9.1750° |
Longitude of ascending node | 182.9293° |
| 290.0678° | |
| Earth MOID | 0.0191611 AU (2.86646 Gm) |
| Physical characteristics | |
Mean diameter | 50–111 m[a] |
| 23.9 | |
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