(374158) 2004 UL

(374158) 2004 UL
Discovery
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	18 October 2004
Designations
MPC designation	(374158) 2004 UL
Alternative designations	2004 UL
Minor planet category	Apollo; NEO; PHA; Mercury crosser; Venus crosser; Earth crosser; Mars crosser;
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	15.05 yr (5,498 days)
Aphelion	2.4400 AU
Perihelion	0.0928 AU
Semi-major axis	1.2664 AU
Eccentricity	0.9267
Orbital period (sidereal)	1.43 yr (521 days)
Mean anomaly	320.92°
Mean motion	0° 41m 29.76s / day
Inclination	23.785°
Longitude of ascending node	39.575°
Argument of perihelion	149.57°
Earth MOID	0.0182 AU (7.1 LD)
Physical characteristics
Mean diameter	0.5–1.2 km (generic); 0.516 km (calculated);
Synodic rotation period	38±2 h
Geometric albedo	0.20 (assumed)
Spectral type	S;
Absolute magnitude (H)	18.77 (R); 18.8;

(374158) 2004 UL is a sub-kilometer asteroid on an outstandingly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. The object is known for having the second-smallest perihelion of any known asteroid, after (137924) 2000 BD19.

It was discovered on 18 October 2004 by the Lincoln Near-Earth Asteroid Research (LINEAR) at Lincoln Lab's ETS near Socorro, New Mexico.