+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   43797 (1991 AF2) Classification: Main-belt Asteroid          SPK-ID: 2043797 [ 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 .1608821309898161 7.5033e-08   a 2.62117090817128 2.6947e-08 AU q 2.199471346776173 1.9296e-07 AU i 12.23738831417269 9.9417e-06 deg node 184.8859480617268 3.4383e-05 deg peri 245.9413542260143 4.6439e-05 deg M 97.18726800959412 2.9127e-05 deg tp 2455982.045436098685 (2012-Feb-24.54543610) 0.00012527 JED period 1550.034753416488 4.24 2.3902e-05 6.544e-08 d yr n .2322528570449862 3.5815e-09 deg/d Q 3.042870469566387 3.1282e-08 AU   Orbit Determination Parameters    # obs. used (total)      513      data-arc span      8179 days (22.39 yr)      first obs. used      1990-11-20      last obs. used      2013-04-12      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .5983      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 16:00:08   Additional Information  Earth MOID = 1.24363 AU   T_jup = 3.354  [ 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 14.261 mag .62203 1 autocmod 2.5c 43797 (1991 AF2)          Discovered 1991-Jan-07 by McNaught, R. H. at Siding Spring (413) Reference: 20020822/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 AF2 = 1998 QW51  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-21 10:00 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin