Puneet Varma (Editor)

(374158) 2004 UL

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Discovered by

Discovery date
18 October 2004

Alternative names
2004 UL

Asteroid group
Apollo asteroid

Discovery site
Lincoln Lab's ETS

MPC designation
(374158) 2004 UL

18 October 2004

Minor planet category
Apollo · NEO · PHA · Mercury crosser · Venus crosser · Earth crosser · Mars crosser

Lincoln Near-Earth Asteroid Research

4183 Cuno, 69230 Hermes, 2063 Bacchus, 1685 Toro, (33342) 1998 WT24

(374158) 2004 UL is an outstandingly eccentric asteroid, classified as near-Earth object and potentially hazardous asteroid. It is known for having the second-smallest perihelion of any known asteroid, after (137924) 2000 BD19. It measures between 0.5 and 1.2 kilometers in diameter and was discovered by the Lincoln Near-Earth Asteroid Research (LINEAR) at Lincoln Lab's ETS on 18 October 2004.

The stony S-type asteroid orbits the Sun at a distance of 0.1–2.4 AU once every 1 years and 5 months (521 days). Its orbit has an eccentricity of 0.93 and an inclination of 24° with respect to the ecliptic.

In October 2014, a rotational light-curve for this asteroid was obtained from photometric observations by American astronomer Brian D. Warner at the Palmer Divide Station, California. It gave a relatively slow rotation period of 7001380000000000000♠38±2 hours with a high brightness variation of 1.2 in magnitude (U=2).

Due to its orbit, it is also a Mercury-crosser, Venus-crosser, Apollo and Mars-crosser.


(374158) 2004 UL Wikipedia