+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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 (2003-May-05.54271437) 1.2528e-05 TDB period 365.2798439456676 1.00 1.425e-07 3.901e-10 d yr 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  [ show covariance matrix ] [ 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) http://www.asu.cas.cz/~ppravec/neo.htm] [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.arc Last Updated: 2007-07-05 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-04 12:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin