 | This article needs to be updated. The reason given is: New Arecibo radar results presented at the 8th IAA Planetary Defense Conference in April 2023[1]. (April 2023) |
_1998_OR2&sq=Qlik&lang=&file=File:1998_OR2_Arecibo.png) Arecibo Observatory radar image of 1998 OR2 with a crater on 18 April 2020 | |
| Discovery[2][3] | |
|---|---|
| Discovered by | NEAT |
| Discovery site | Haleakala Obs. |
| Discovery date | 24 July 1998 |
| Designations | |
| (52768) 1998 OR2 | |
| 1998 OR2 | |
| Amor · NEO · PHA[2][3] | |
| Orbital characteristics[2] | |
| 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 |
| 2.380 AU | |
| Eccentricity | 0.5754 |
| 3.67 yr (1,342 days) | |
| 280.159° | |
| 0° 16m 6.082s / day | |
| Inclination | 5.878° |
| 26.942° | |
| 174.580° | |
| Earth MOID | 0.00866 AU (3.37 LD) |
| Physical characteristics[1]: 6 | |
| Dimensions | 2.08 × 1.93 × 1.60 km (± 0.10 × 0.10 × 0.03 km) |
| 1.78±0.10 km | |
| 10.67 km2 | |
| Volume | 3.0±0.5 km3 |
Mean density | 3.2±0.2 g/cm3 |
| 4.10872±0.00001 h | |
| 69.3°±5° (wrt ecliptic)[a] | |
Pole ecliptic latitude | 20.7°±5° |
Pole ecliptic longitude | 332.3°±5° |
| 0.15[5] | |
| Xn or S[5] | |
| 15.72±0.02[6] 16.04[2][3] | |
(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 passed very near to earth on 29 April 2020 at around 4:15am.[3] It is one of the brightest and therefore largest potentially hazardous asteroids known to exist.[7] With an observation arc of 35 years, the asteroid has a well-determined orbit, and its trajectory is well known through the year 2197.[2] The asteroid's orbit is only potentially hazardous on a time scale of thousands of years.[8]
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