(374158) 2004 UL

(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.

(374158) 2004 UL
Discovery
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date18 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 arc15.05 yr (5,498 days)
Aphelion2.4400 AU
Perihelion0.0928 AU
Semi-major axis
1.2664 AU
Eccentricity0.9267
Orbital period (sidereal)
1.43 yr (521 days)
Mean anomaly
320.92°
Mean motion
0° 41m 29.76s / day
Inclination23.785°
Longitude of ascending node
39.575°
149.57°
Earth MOID0.0182 AU (7.1 LD)
Physical characteristics
Mean diameter
  • 0.5–1.2 km (generic)
  • 0.516 km (calculated)
Synodic rotation period
38±2 h
0.20 (assumed)
  • S
  • 18.77 (R)
  • 18.8

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

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