+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   13971 (1991 UF1) Classification: Main-belt Asteroid          SPK-ID: 2013971 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO233600 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.2101361 n/a   a 2.3776457 n/a AU q 1.8780165 n/a AU i 3.40277 n/a deg node 93.31763 n/a deg peri 308.50616 n/a deg M 305.20799 n/a deg tp 2456604.3139296 (2013-Nov-07.81392960) n/a JED period 1339.1188724 3.67 n/a n/a d yr n 0.26883349 n/a deg/d Q 2.8772749 n/a AU   Orbit Determination Parameters    # obs. used (total)      594      first obs. used      1991-??-??      last obs. used      2012-06-18      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.55      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.508  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.0 mag n/a PDS3 (MPC 39043)   13971 (1991 UF1)          Discovered 1991-Oct-18 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 20000320/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 UF1 = 1993 FR31  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-20 17:30 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin