Global Information1685 Toro information
 Shape model of Toro from its lightcurve | |
| Discovery[1] | |
|---|---|
| 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)[2] |
Alternative designations | 1948 OA |
Minor planet category | NEO · Apollo[1][3] Mars-crosser |
| Symbol |  (astrological) |
| Orbital characteristics[1] | |
| 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° |
Argument of perihelion | 127.207° |
| Earth MOID | 0.0507 AU · 19.7 LD |
| Physical characteristics | |
Mean diameter | 3.810±0.049 km[4] 4.1 km[5] 3.5+0.3 −0.4 km[6] |
Synodic rotation period | 10.185±0.003 h[7] 10.1862±0.0006 h[8] 10.191±0.005 h[9] 10.195 h[10] 10.19540 h[11] 10.196 h[12] 10.199±0.003 h[13] 10.1995±0.0004 h[14] 10.203±0.003 h[15] 10.197826±0.000002 h[6] |
Geometric albedo | 0.247±0.049[4] 0.29[5] 0.38±0.33[16] |
Spectral type |
|
Absolute magnitude (H) | 13.90[5][18] · 14.02±1.11[19] · 14.23[1][4] |
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.[3][20] 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.[2]
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