+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   13972 (1991 UN3) Classification: Main-belt Asteroid          SPK-ID: 2013972 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO256967 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0975634 n/a   a 2.2944244 n/a AU q 2.0705726 n/a AU i 4.56239 n/a deg node 84.26110 n/a deg peri 305.18874 n/a deg M 79.26082 n/a deg tp 2456121.0107414 (2012-Jul-12.51074140) n/a JED period 1269.4308877 3.48 n/a n/a d yr n 0.28359165 n/a deg/d Q 2.5182762 n/a AU   Orbit Determination Parameters    # obs. used (total)      858      first obs. used      1991-??-??      last obs. used      2013-03-05      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.57      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.585  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.6 mag n/a PDS3 (MPC 39043)   13972 (1991 UN3)          Discovered 1991-Oct-31 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 20000320/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-20 01:39 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin