+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   16537 (1991 PF11) Classification: Main-belt Asteroid          SPK-ID: 2016537 [ 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 .1328088749405499 6.8463e-08   a 2.753204994751289 3.0903e-08 AU q 2.387554936917668 1.9411e-07 AU i 8.384085349836827 7.3954e-06 deg node 288.2288749540735 4.3407e-05 deg peri 347.0791908556779 5.2149e-05 deg M 318.8196628635691 3.2184e-05 deg tp 2456591.372625352067 (2013-Oct-25.87262535) 0.00015034 JED period 1668.615409803315 4.57 2.8094e-05 7.692e-08 d yr n .2157477378459752 3.6325e-09 deg/d Q 3.11885505258491 3.5008e-08 AU   Orbit Determination Parameters    # obs. used (total)      973      data-arc span      7920 days (21.68 yr)      first obs. used      1991-08-07      last obs. used      2013-04-13      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .55282      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:03:26   Additional Information  Earth MOID = 1.37212 AU   T_jup = 3.316  [ 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 (MPO 2862)   16537 (1991 PF11)          Discovered 1991-Aug-08 by Holt, H. E. at Palomar (675) Reference: 20000913/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 PF11 = 1998 BN12  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-26 07:38 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin