+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   5487 (1991 UM4) Classification: Main-belt Asteroid          SPK-ID: 2005487 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1617475575376953 7.675e-08   a 2.41158887039973 1.4587e-08 AU q 2.021520260827484 1.8992e-07 AU i 2.307451928705751 7.912e-06 deg node 355.8803465739121 0.00014713 deg peri 241.7539392879289 0.00014959 deg M 53.77351553926132 2.9894e-05 deg tp 2456196.176056190206 (2012-Sep-25.67605619) 0.000113 JED period 1367.896798895742 3.75 1.2411e-05 3.398e-08 d yr n .2631777487092711 2.3879e-09 deg/d Q 2.801657479971976 1.6947e-08 AU   Orbit Determination Parameters    # obs. used (total)      974      data-arc span      21773 days (59.61 yr)      first obs. used      1953-09-06      last obs. used      2013-04-17      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .58518      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:17:05   Additional Information  Earth MOID = 1.01116 AU   T_jup = 3.500  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.2 mag n/a PDS3 (MPC 28113)   5487 (1991 UM4)          Discovered 1991-Oct-18 by Ueda and Kaneda at Kushiro (399) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1991 UM4 = 1983 RD8 = 1990 LC  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 05:36 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin