1685 Toro
1685 Toro (prov. designation: 1948 OA) is an asteroid and near-Earth object of the Apollo group on an eccentric orbit. It was discovered on 17 July 1948, by American astronomer Carl Wirtanen at Lick Observatory on Mount Hamilton, California. The stony S-type asteroid has a rotation period of 10.2 hours and measures approximately 4 kilometers (2.5 miles) in diameter. It is named for Betulia Toro Herrick, wife of astronomer Samuel Herrick.
Shape model of Toro from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | C. A. Wirtanen |
| Discovery site | Lick Obs. |
| Discovery date | 17 July 1948 |
| Designations | |
MPC designation | (1685) Toro |
Named after | Betulia Toro Herrick (wife Samuel Herrick) |
Alternative designations | 1948 OA |
Minor planet category | NEO · Apollo Mars-crosser |
| Symbol | (astrological) |
| Orbital characteristics | |
| Epoch 31 May 2021 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 72.59 yr (26,512 days) |
| Aphelion | 1.9636 AU |
| Perihelion | 0.7715 AU |
Semi-major axis | 1.3676 AU |
| Eccentricity | 0.4358 |
Orbital period (sidereal) | 1.60 yr (584 days) |
Mean anomaly | 290.251° |
| Inclination | 9.383° |
Longitude of ascending node | 274.245° |
| 127.207° | |
| Earth MOID | 0.0507 AU · 19.7 LD |
| Physical characteristics | |
Mean diameter | 3.810±0.049 km 4.1 km 3.5+0.3 −0.4 km |
Synodic rotation period | 10.185±0.003 h 10.1862±0.0006 h 10.191±0.005 h 10.195 h 10.19540 h 10.196 h 10.199±0.003 h 10.1995±0.0004 h 10.203±0.003 h 10.197826±0.000002 h |
| 0.247±0.049 0.29 0.38±0.33 | |
| 13.90 · 14.02±1.11 · 14.23 | |
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