54509 YORP

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54509 YORP
54509 YORP image radar and 3D model.gif
Radar image and 3D model
Discovery[1] and designation
Discovered by Lincoln Laboratory Near-Earth Asteroid Research (LINEAR) Team
Discovery site Socorro
Discovery date August 3, 2000
Designations
MPC designation 54509
Named after
YORP effect
2000 PH5
Minor planet category Apollo Apollo
Orbital characteristics[2]
Epoch February 4, 2008 (JD 2454500.5)
Aphelion 185.007 Gm (1.237 AU)
Perihelion 115.804 Gm (0.774 AU)
150.405 Gm (1.005 AU)
Eccentricity 0.230
368.218 d (1.01 a)
29.31 km/s
260.696°
Inclination 1.601°
278.392°
Physical characteristics
Dimensions 150×128×93 m[3]
0.2029 h
12.174 min[4]
173°[3]
-85°[3]
180°[3]
0.10?
Temperature ~278 K
22.7

54509 YORP (2000 PH5) is an Apollo near-Earth object (NEO) discovered on August 3, 2000 by the Lincoln Laboratory Near-Earth Asteroid Research (LINEAR) Team at Socorro. Measurements of the rotation rate of this object provided the first observational evidence of the YORP effect, hence the name of the asteroid. The asteroid's rate of rotation is increasing at the rate of (2.0 ± 0.2) × 10−4 deg/day2 which between 2001 and 2005 caused the asteroid to rotate about 250° further than its spin rate in 2001 would have predicted.[3] Simulations of the asteroid suggest that it may reach a rotation period of ~20 seconds near the end of its expected lifetime.[5] The simulations also ruled out the possibility that close encounters with the Earth have been the cause of the increased spin rate.[5]

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