+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   5645 (1990 SP) Classification: Apollo [NEO]          SPK-ID: 2005645 [ 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 94 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3874129463880272 6.7234e-08   a 1.354982399832311 2.5955e-09 AU q .8300446760093557 9.0463e-08 AU i 13.50927074048125 1.0468e-05 deg node 45.78613276162836 2.762e-05 deg peri 48.13921611530569 3.1309e-05 deg M 59.58068214711458 7.2524e-06 deg tp 2456305.154131634080 (2013-Jan-12.65413163) 1.1727e-05 JED period 576.1013700208802 1.58 1.6553e-06 4.532e-09 d yr n .6248900258420704 1.7955e-09 deg/d Q 1.879920123655267 3.6011e-09 AU   Orbit Determination Parameters    # obs. used (total)      503      data-arc span      14153 days (38.75 yr)      first obs. used      1974-08-13      last obs. used      2013-05-13      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .52974      data source      ORB      producer      Otto Matic      solution date      2013-May-14 01:15:56   Additional Information  Earth MOID = .0543083 AU   T_jup = 4.755  [ 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 17.0 mag n/a PDS3 (MPC 28113)   rotation period rot_per 30.39 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Pravec, P.; et al. (2005) Icarus 173, 108-131.] 5645 (1990 SP)          Discovered 1990-Sep-20 by McNaught, R. H. at Siding Spring (413) 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-19 00:31 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin