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54509 YORP (2000 PH5)
Classification: Apollo [NEO]          SPK-ID: 2054509
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2452656.5 (2003-Jan-17.0) TDB
Reference: JPL 86 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2299152810893584 1.4245e-07  
a 1.000041879891858 2.6009e-10 au
q .7701169699753911 1.4248e-07 au
i 1.833144651971708 5.1903e-06 deg
node 281.8868831284319 6.7014e-05 deg
peri 274.1047626711903 6.4367e-05 deg
M 253.0261884916319 1.2351e-05 deg
tp 2452765.042714372361
1.2528e-05 TDB
period 365.2798439456676
n .9855457561286822 3.8448e-10 deg/d
Q 1.229966789808325 3.1989e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -8.740009449151943E-14 3.077E-14
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      550  
   # delay obs. used      4  
   # Doppler obs. used      1  
   data-arc span      1826 days (5.00 yr)  
   first obs. used      2000-08-03  
   last obs. used      2005-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39374  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jan-14 15:21:34  

Additional Information
 Earth MOID = .00276915 au 
 Jupiter MOID = 3.72696 au 
 T_jup = 6.056 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbit Covariance (7×7)
  e q tp node peri i A2
e 2.029291154957192E-14 -2.029668242368718E-14 1.778423683147044E-12 -4.726357271547326E-12 4.110758343838035E-12 -3.44965975158824E-13 4.031647179056466E-22
q -2.029668242368718E-14 2.030049369543398E-14 -1.778740893165356E-12 4.732444264136253E-12 -4.116767068355998E-12 3.453906842800804E-13 -4.089706870501455E-22
tp 1.778423683147044E-12 -1.778740893165356E-12 1.569434471285242E-10 -3.641979378356967E-10 3.112732080420097E-10 -2.609753735885709E-11 3.510637701633851E-20
node -4.726357271547326E-12 4.732444264136253E-12 -3.641979378356967E-10 4.490921315040732E-9 -4.307139330662703E-9 3.464938803790133E-10 -8.381723840446055E-19
peri 4.110758343838035E-12 -4.116767068355998E-12 3.112732080420097E-10 -4.307139330662703E-9 4.143073671660627E-9 -3.325739803192042E-10 8.33947655050941E-19
i -3.44965975158824E-13 3.453906842800804E-13 -2.609753735885709E-11 3.464938803790133E-10 -3.325739803192042E-10 2.693890684944884E-11 -5.684882394693873E-20
A2 4.031647179056466E-22 -4.089706870501455E-22 3.510637701633851E-20 -8.381723840446055E-19 8.33947655050941E-19 -5.684882394693873E-20 9.465292617550382E-28

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 22.7   n/a MPO214232  
rotation period rot_per 0.2029 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2001)]
[Hergenrother, C.W.; Whiteley, R.J. (2005) Bull. Amer. Astron. Soc. 37, 636-637.]
[Lowry, S.C.; Fitzsimmons, A.; Pravec, P.; Vokrouhlicky, D.; et al. (2007) Science 316, 272-274.]
[Taylor, P.A.; Margot, J.-L.; Vokrouhlikcy, D.; Scheeres, D.J.; et al. (2007) Science 316, 274-276.]
[Hergenrother, C.W.; Whitely, R.J. (2011) Icarus 214, 194-209.]

54509 YORP           Discovered 2000 Aug. 3 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
This naming collectively honors Ivan O. Yarkovsky, John A. O'Keefe, V. V. Rad- zievskij and Stephen J. Paddack, who were instrumental to the realization that radiation torques due to sunlight can affect the spin states of minor planets. Data on this object provided the first direct observational evidence for the YORP effect.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070402/MPCPages.arcLast Updated: 2007-07-05

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