+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   85191 (1991 RP4) Classification: Main-belt Asteroid          SPK-ID: 2085191 [ 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 .2619935888883985 8.4244e-08   a 2.755966971987653 4.2372e-08 AU q 2.033921294138715 2.3462e-07 AU i 8.223813605969092 1.3653e-05 deg node 228.487264467151 6.2433e-05 deg peri 118.0583760645264 6.9814e-05 deg M 264.1698725228527 3.3742e-05 deg tp 2456845.345298430776 (2014-Jul-06.84529843) 0.00016442 JED period 1671.126937332617 4.58 3.854e-05 1.055e-07 d yr n .2154234917513908 4.9681e-09 deg/d Q 3.47801264983659 5.3474e-08 AU   Orbit Determination Parameters    # obs. used (total)      252      data-arc span      7892 days (21.61 yr)      first obs. used      1991-09-07      last obs. used      2013-04-16      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .53941      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 17:42:59   Additional Information  Earth MOID = 1.04273 AU   T_jup = 3.278  [ 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 15.1 mag n/a MPC47683   85191 (1991 RP4)          Discovered 1991-Sep-07 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 20040830/Numbers.arc Last Updated: 2004-09-06 Alternate Designations  1991 RP4 = 2000 OU38  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-23 00:20 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin