+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   4688 (1980 WF) Classification: Amor [NEO]          SPK-ID: 2004688 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5154116534534029 8.5686e-08   a 2.234889652358994 4.1566e-09 AU q 1.083001481350744 1.8973e-07 AU i 6.378613921169779 1.2151e-05 deg node 241.3524311200066 4.946e-05 deg peri 213.5274476598913 6.0961e-05 deg M 245.8652174823175 1.3168e-05 deg tp 2456787.399411195207 (2014-May-09.89941120) 4.5477e-05 JED period 1220.344797246148 3.34 3.4045e-06 9.321e-09 d yr n .2949985945057351 8.2298e-10 deg/d Q 3.386777823367243 6.2989e-09 AU   Orbit Determination Parameters    # obs. used (total)      198      data-arc span      11050 days (30.25 yr)      first obs. used      1980-11-29      last obs. used      2011-03-02      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .63711      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 15:43:35   Additional Information  Earth MOID = .113597 AU   T_jup = 3.445  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 19.0 mag n/a PDS3 (MPC 28112)   diameter diameter 0.6 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   geometric albedo albedo 0.18   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   B-V BV .930 mag .047 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=21.35, mean=21.82, max.=22.29) deg. U-B UB .463 mag .059 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=21.35, mean=21.82, max.=22.29) deg. Tholen spectral type spec_T QU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B V   n/a Binzel et al. (2004) Icarus 170, 259-294   4688 (1980 WF)          Discovered 1980-Nov-29 by Kowal, C. T. at Palomar (675) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-22 14:33 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin