54509 YORP
|
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 | |
Apollo  | |
| Orbital characteristics[2] | |
| Epoch December 9, 2014 (JD 2457000.5) | |
| Aphelion | 1.23748 AU |
| Perihelion | 0.77462 AU |
| 1.00605 AU | |
| Eccentricity | 0.23004 |
| 368.576 d (1.01 a) | |
Average orbital speed | 29.31 km/s |
| 183.17061° | |
| Inclination | 1.59975° |
| 278.32002° | |
| Physical characteristics | |
| Dimensions | 150×128×93 m[3] |
Sidereal rotation period |
0.2029 h 12.174 min[4] |
| 173°[3] | |
Pole ecliptic latitude | -85°[3] |
Pole ecliptic longitude | 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]
On January 2, 2104, asteroid YORP will pass 0.00526 AU (787,000 km; 489,000 mi) from Earth.[6]
See also
Further reading
- Mueller, Michael (2007). "Surface Properties of Asteroids from Mid-Infrared Observations and Thermophysical Modeling". Doctoral Dissertation.
References
- ↑ Discovery Circumstances: Numbered Minor Planets
- ↑ The Asteroid Orbital Elements Database
- ↑ 3.0 3.1 3.2 3.3 3.4 Taylor, Patrick A. et al. (2007-04-13). "Spin Rate of Asteroid (54509) 2000 PH5 Increasing Due to the YORP Effect" (PDF). Science 316 (5822): 274–277. doi:10.1126/science.1139038.
- ↑ 54509 YORP at the JPL Small-Body Database
- ↑ 5.0 5.1 Lowry, Stephen C. et al. (2007-04-13). "Direct Detection of the Asteroidal YORP Effect" (PDF). Science 316 (5822): 272–274. Bibcode:2007Sci...316..272L. doi:10.1126/science.1139040. PMID 17347414.
- ↑ "JPL Close-Approach Data: 54509 YORP (2000 PH5)" (last observation: 2005-08-03; arc: 5 yr). Retrieved 2015-02-28.
External links
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