1994 WR12
1994 WR12 is an asteroid and near-Earth object approximately 130 meters (430 feet) in diameter. As a member of the Aten group almost all of its orbit is closer to the Sun than Earth is. On 24 November 1994 it passed about 374100 km from the Moon. First imaged at Kitami Observatory on 26 November 1994, it was discovered two nights later by American astronomer Carolyn S. Shoemaker at Palomar Observatory on 28 November 1994. The asteroid then went unobserved from 1994 until it was recovered by Mauna Kea in March 2016. It was removed from the Sentry Risk Table on 2 April 2016.
| Date | JPL SBDB nominal geocentric distance |
uncertainty region (3-sigma) |
|---|---|---|
| 2021-11-29 | 6152189 km | ± 34 km |
| 2046-11-25 | 1633719 km | ± 4133 km |
| 2190-11-23 | 135000000 km | ± 815 million km |
| Discovery | |
|---|---|
| Discovered by | C. S. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 28 November 1994 |
| Designations | |
MPC designation | 1994 WR12 |
Minor planet category | NEO · Aten |
| Orbital characteristics | |
| Epoch 2022-Jan-21 (JD 2459600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 27.01 yr (9,864 d) |
| Aphelion | 1.0577 AU (158.23 million km) |
| Perihelion | 0.4562 AU (68.25 million km) |
Semi-major axis | 0.7570 AU (113.25 million km) |
| Eccentricity | 0.39735 |
Orbital period (sidereal) | 240.6 days (0.659 yr) |
Mean anomaly | 217.06° |
Mean motion | 1° 29m 45.96s / day |
| Inclination | 6.8515° |
Longitude of ascending node | 62.608° |
| 206.03° | |
| Earth MOID | 0.0018 AU (0.70 LD) |
| Physical characteristics | |
Mean diameter | 130 m (est.) 92 – 210 m (CNEOS) |
| Mass | 2.9×109 kg (est.) |
| 22.3 | |
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