Trajectory
| Discovery [1][2] | |
|---|---|
| Discovered by | ATLAS-HKO |
| Discovery site | Haleakala Obs. |
| Discovery date | 23 September 2019 (first observed only) |
| Designations | |
| 2019 SU3 | |
| NEO · Apollo [1][2] | |
| Orbital characteristics [2] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 2[2] · 3[1] | |
| Observation arc | 28 days |
| Aphelion | 1.1948 AU |
| Perihelion | 0.9922 AU |
| 1.0935 AU | |
| Eccentricity | 0.0927 |
| 1.14 yr (418 d) | |
| 257.62° | |
| 0° 51m 42.84s / day | |
| Inclination | 1.1621° |
| 5.1182° | |
| 322.69° | |
| Earth MOID | 0.0022 AU (0.86 LD) |
| Physical characteristics | |
Mean diameter | 15 m[3][4] |
| 27.2[1] 27.28[2] | |
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.[2] It was removed from the Sentry Risk Table on 12 October 2019.
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.[3][5][6][7] According to astronomers, "Its small size of about 15 m (49 ft) would result in limited consequences even in case of impact."[3]
