2019 SU3
2019 SU3 is a very small near-Earth asteroid of the Apollo group, first observed by the Asteroid Terrestrial-impact Last Alert System at Haleakala Observatory on 23 September 2019. It was briefly listed on the Risk List of the European Space Agency. With a 18-day observation arc, the nominal orbit passes 0.02 AU (3,000,000 km; 1,900,000 mi) from Earth on 27 September 2084. It was removed from the Sentry Risk Table on 12 October 2019.
| Discovery | |
|---|---|
| Discovered by | ATLAS-HKO |
| Discovery site | Haleakala Obs. |
| Discovery date | 23 September 2019 (first observed only) |
| Designations | |
MPC designation | 2019 SU3 |
Minor planet category | NEO · Apollo |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 2 · 3 | |
| Observation arc | 28 days |
| Aphelion | 1.1948 AU |
| Perihelion | 0.9922 AU |
Semi-major axis | 1.0935 AU |
| Eccentricity | 0.0927 |
Orbital period (sidereal) | 1.14 yr (418 d) |
Mean anomaly | 257.62° |
Mean motion | 0° 51m 42.84s / day |
| Inclination | 1.1621° |
Longitude of ascending node | 5.1182° |
| 322.69° | |
| Earth MOID | 0.0022 AU (0.86 LD) |
| Physical characteristics | |
Mean diameter | 15 m |
| 27.2 27.28 | |
Based on calculations with a shorter observation arc, the asteroid could have passed very close to Earth, about 9,700 km (6,000 mi), in mid-September, 2084. According to astronomers, "Its small size of about 15 m (49 ft) would result in limited consequences even in case of impact."
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