(52768) 1998 OR2
(52768) 1998 OR2 (provisional designation 1998 OR2) is an asteroid on an eccentric orbit, classified as a near-Earth object and potentially hazardous asteroid of the Amor group, with a diameter of 2 kilometers (1.2 mi). It was discovered on 24 July 1998, by astronomers of the Near-Earth Asteroid Tracking (NEAT) program at the Haleakala Observatory, Hawaii. It is one of the brightest and therefore largest potentially hazardous asteroids known to exist. With an observation arc of 35 years, the asteroid has a well-determined orbit, and its trajectory is well known through the year 2197. The asteroid's orbit is only potentially hazardous on a time scale of thousands of years.
Arecibo Observatory radar image of 1998 OR2 with a crater on 18 April 2020 | |
| Discovery | |
|---|---|
| Discovered by | NEAT |
| Discovery site | Haleakala Obs. |
| Discovery date | 24 July 1998 |
| Designations | |
MPC designation | (52768) 1998 OR2 |
Alternative designations | 1998 OR2 |
Minor planet category | Amor · NEO · PHA |
| Orbital characteristics | |
| Epoch 25 February 2023 (JD 2460000.5 ) | |
| Uncertainty parameter 0 | |
| Observation arc | 35.49 yr (12,963 days) |
| Earliest precovery date | 30 June 1987 (Siding Spring Obs.) |
| Aphelion | 3.750 AU |
| Perihelion | 1.011 AU |
Semi-major axis | 2.380 AU |
| Eccentricity | 0.5754 |
Orbital period (sidereal) | 3.67 yr (1,342 days) |
Mean anomaly | 280.159° |
Mean motion | 0° 16m 6.082s / day |
| Inclination | 5.878° |
Longitude of ascending node | 26.942° |
| 174.580° | |
| Earth MOID | 0.00866 AU (3.37 LD) |
| Physical characteristics: 6 | |
| Dimensions | 2.08 × 1.93 × 1.60 km (± 0.10 × 0.10 × 0.03 km) |
Mean diameter | 1.78±0.10 km |
Surface area | 10.67 km2 |
| Volume | 3.0±0.5 km3 |
Mean density | 3.2±0.2 g/cm3 |
Synodic rotation period | 4.10872±0.00001 h |
| 69.3°±5° (wrt ecliptic) | |
Pole ecliptic latitude | 20.7°±5° |
Pole ecliptic longitude | 332.3°±5° |
| 0.15 | |
| Xn or S | |
| 15.72±0.02 16.04 | |
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