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54509 YORP, provisional designation 2000 PH5, is an Earth co-orbital asteroid[5] discovered on 3 August 2000 by the Lincoln Laboratory Near-Earth Asteroid Research (LINEAR) Team at Lincoln Laboratory Experimental Test Site in Socorro, New Mexico. 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.[4] Simulations of the asteroid suggest that it may reach a rotation period of ~20 seconds near the end of its expected lifetime.[6] The simulations also ruled out the possibility that close encounters with the Earth have been the cause of the increased spin rate.[6]

54509 YORP
Radar image and 3D model of YORP
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date3 August 2000
Designations
MPC designation
(54509) YORP
Named after
YORP effect
Alternative designations
2000 PH5
Minor planet category
Apollo
NEO
Orbital characteristics[2][3]
Epoch 20 March 2003 (JD 2452718.5)
Uncertainty parameter 0
Observation arc1826 days (5.00 yr)
Aphelion1.22998 AU (184.002 Gm)
Perihelion0.77013 AU (115.210 Gm)
Semi-major axis
1.00005 AU (149.605 Gm)
Eccentricity0.22991
Orbital period (sidereal)
1.00 yr (365.29 d)
Average orbital speed
29.31 km/s
Mean anomaly
314.13265°
Mean motion
0° 59m 7.901s / day
Inclination1.83313°
Longitude of ascending node
281.88673°
Argument of perihelion
274.101°
Earth MOID0.00268922 AU (402,302 km)
Jupiter MOID3.72701 AU (557.553 Gm)
TJupiter6.056
Physical characteristics
Dimensions150×128×93 m[4]
Synodic rotation period
0.2029 h (12.17 min)
Sidereal rotation period
0.2029 h
12.174 min[3]
Axial tilt
173°[4]
Pole ecliptic latitude
−85°[4]
Pole ecliptic longitude
180°[4]
Geometric albedo
0.10?
Temperature~278 K
Absolute magnitude (H)
22.7

    On 2 January 2104, asteroid YORP will pass 0.00526 AU (787,000 km; 489,000 mi) from Earth.[7]



    Animation of 54509 YORP orbit from 1600 to 2500
    Relative to Sun and Earth
    Around Earth
    Around Sun
       Sun ·    Earth ·   54509 YORP

    See also



    References


    1. Discovery Circumstances: Numbered Minor Planets
    2. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
    3. "54509 YORP". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 54509. Retrieved 12 April 2016.
    4. Taylor, Patrick A.; et al. (13 April 2007). "Spin Rate of Asteroid (54509) 2000 PH5 Increasing Due to the YORP Effect" (PDF). Science. 316 (5822): 274–277. Bibcode:2007Sci...316..274T. doi:10.1126/science.1139038. PMID 17347415. S2CID 29191700.
    5. Christou, Apostolos A.; Asher, David J. (2011). "A long-lived horseshoe companion to the Earth". Preprint. 414 (4): 2965–2969. arXiv:1104.0036. Bibcode:2011MNRAS.414.2965C. doi:10.1111/j.1365-2966.2011.18595.x. S2CID 13832179.
    6. Lowry, Stephen C.; et al. (13 April 2007). "Direct Detection of the Asteroidal YORP Effect" (PDF). Science. 316 (5822): 272–274. Bibcode:2007Sci...316..272L. doi:10.1126/science.1139040. PMID 17347414. S2CID 26687221. Archived from the original (PDF) on 24 July 2011.
    7. "JPL Close-Approach Data: 54509 YORP (2000 PH5)" (last observation: 2005-08-03; arc: 5 yr). Retrieved 28 February 2015.

    Further reading





    На других языках

    [de] (54509) YORP

    (54509) YORP ist ein erdnaher Asteroid, der am 3. August 2000 vom Team des Lincoln-Institut zur Erforschung erdnaher Asteroiden in Socorro entdeckt wurde. Durch Messungen der Rotationsrate dieses Asteroiden konnte zum ersten Mal der YORP-Effekt beobachtet und bewiesen werden. Durch ihn steigt die Rotationsgeschwindigkeit des Asteroiden um 2,0 (±0,2) × 10⁻⁴ deg/day².[1] Simulationen des Asteroiden legen nahe, dass er sich in den nächsten 35 Millionen Jahren in einer stabilen Umlaufbahn um die Sonne befinden wird. Bis dahin wird er eine Rotationsperiode von etwa 20 Sekunden erreicht haben. Die Kräfte, die bei dieser außerordentlich hohen Rotationsgeschwindigkeit auftreten, können dann dazu führen, dass sich die Form des Asteroiden ändert oder dass er dadurch zerbricht.[2] Die Simulationen schlossen zudem aus, dass sich der Anstieg der Rotationsperiode durch die Nähe der Vorbeiflüge an der Erde erklären lässt.[3]
    - [en] 54509 YORP

    [ru] (54509) YORP

    (54509) YORP (2000 PH5) — небольшой быстровращающийся астероид из группы Аполлонов, относящийся к астероидам, сближающимся с Землёй. Он был обнаружен 3 августа 2000 года командой специалистов из лаборатории LINEAR, Сокорро.


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