1685 Toro

1685 Toro
	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
Orbital characteristics
	Epoch 5 May 2025 (JD 2460800.5)
	Uncertainty parameter 0
Observation arc	76.75 yr (28,032 days)
Aphelion	1.9643 AU
Perihelion	0.7714 AU
Semi-major axis	1.3679 AU
Eccentricity	0.4360
Orbital period (sidereal)	1.60 yr (584 days)
Mean anomaly	319.462°
Inclination	9.382°
Longitude of ascending node	274.208°
Argument of perihelion	127.279°
Earth MOID	0.0510 AU · 19.9 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
Geometric albedo	0.247±0.049; 0.29; 0.38±0.33
Spectral type	S (Tholen); S (SMASS); S; B–V = 0.880; U–B = 0.470;
Absolute magnitude (H)	13.90 · 14.02±1.11 · 14.28 · 14.23

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.