54509 YORP
Radar image and 3D model
|
|
| Discovery | |
|---|---|
| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research (LINEAR) Team |
| Discovery site | Socorro |
| Discovery date | 3 August 2000 |
| Designations | |
| MPC designation | 54509 |
|
Named after
|
YORP effect |
| 2000 PH5 | |
Apollo  NEO |
|
| Orbital characteristics | |
| Epoch 20 March 2003 (JD 2452718.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 1826 days (5.00 yr) |
| Aphelion | 1.22998 AU (184.002 Gm) |
| Perihelion | 0.77013 AU (115.210 Gm) |
| 1.00005 AU (149.605 Gm) | |
| Eccentricity | 0.22991 |
| 1.00 yr (365.29 d) | |
|
Average orbital speed
|
29.31 km/s |
| 314.13265° | |
| 0° 59m 7.901s / day | |
| Inclination | 1.83313° |
| 281.88673° | |
| 274.101° | |
| Earth MOID | 0.00268922 AU (402,302 km) |
| Jupiter MOID | 3.72701 AU (557.553 Gm) |
| Jupiter Tisserand parameter | 6.056 |
| Physical characteristics | |
| Dimensions | 150×128×93 m |
| 0.2029 h (12.17 min) | |
|
Sidereal rotation period
|
0.2029 h 12.174 min |
| 173° | |
|
Pole ecliptic latitude
|
−85° |
|
Pole ecliptic longitude
|
180° |
| 0.10? | |
| Temperature | ~278 K |
| 22.7 | |
54509 YORP (2000 PH5) is an Earth co-orbital asteroid 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. Simulations of the asteroid suggest that it may reach a rotation period of ~20 seconds near the end of its expected lifetime. The simulations also ruled out the possibility that close encounters with the Earth have been the cause of the increased spin rate.
On January 2, 2104, asteroid YORP will pass 0.00526 AU (787,000 km; 489,000 mi) from Earth.
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