(163899) 2003 SD220
(163899) 2003 SD220 is a sub-kilometer asteroid and tumbling slow rotator, classified as near-Earth object and potentially hazardous asteroid of the Aten group, which orbit the Sun between Venus and Earth. Its orbital period of 0.75 years means that it orbits the Sun about 4 times for every 3 of the Earth. It was discovered on 29 September 2003, by astronomers of the Lowell Observatory Near-Earth-Object Search at Anderson Mesa Station near Flagstaff, Arizona.
Radar image of 2003 SD220 from Arecibo Observatory on 16 December 2018 | |
| Discovery | |
|---|---|
| Discovered by | LONEOS |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 29 September 2003 |
| Designations | |
MPC designation | (163899) 2003 SD220 |
Alternative designations | 2003 SD220 · 2000 AD229 |
Minor planet category | NEO · PHA · Aten |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 15.96 yr (5,828 days) |
| Aphelion | 1.0019 AU |
| Perihelion | 0.6533 AU |
Semi-major axis | 0.8276 AU |
| Eccentricity | 0.2106 |
Orbital period (sidereal) | 0.75 yr (275 days) |
Mean anomaly | 322.67° |
Mean motion | 1° 18m 33.12s / day |
| Inclination | 8.4591° |
Longitude of ascending node | 274.05° |
| 326.47° | |
| Earth MOID | 0.0174 AU · 6.8 LD |
| Physical characteristics | |
Mean diameter | 0.80±0.02 km 1.03 km (calculated) |
Synodic rotation period | 285±5 h 11.9±0.2 days |
| 0.20 (assumed) 0.31±0.04 | |
| S (assumed) | |
| 13.5 (2021 peak) | |
| 17.3 · 17.36 | |
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