2020 BX12
2020 BX12 is a sub-kilometer binary asteroid, classified as a near-Earth asteroid and potentially hazardous object of the Apollo group. It was discovered on 27 January 2020 by the Asteroid Terrestrial-impact Last Alert System survey at the Mauna Loa Observatory during its approach to Earth of 0.02915 AU (4.361 million km; 11.34 LD). Radar observations of the asteroid were carried out by the Arecibo Observatory on 4 February 2020, revealing a natural satellite orbiting 360 m (1,180 ft) from the primary body.
2020 BX12 and its satellite imaged by the Arecibo Observatory in February 2020 | |
| Discovery | |
|---|---|
| Discovered by | ATLAS-MLO |
| Discovery site | Mauna Loa Obs. |
| Discovery date | 27 January 2020 |
| Designations | |
MPC designation | 2020 BX12 |
Alternative designations | A10jUnf |
Minor planet category | Apollo · PHA · NEO |
| Orbital characteristics | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 6.09 yr (2,224 days) |
| Earliest precovery date | 5 January 2014 |
| Aphelion | 2.4437 AU |
| Perihelion | 0.7570 AU |
Semi-major axis | 1.6004 AU |
| Eccentricity | 0.75704 |
Orbital period (sidereal) | 2.02 yr (739.5 d) |
Mean anomaly | 34.442° |
Mean motion | 0° 29m 12.545s / day |
| Inclination | 40.067° |
Longitude of ascending node | 132.904° |
| 70.492° | |
| Known satellites | 1 |
| Earth MOID | 0.002061 AU |
| Physical characteristics | |
Mean diameter | >0.165 km >165 m |
Synodic rotation period | <2.8 h |
| 0.3 | |
| 20.7 | |
| 20.631±0.396 | |
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