+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   23494 (1991 SE2) Classification: Main-belt Asteroid          SPK-ID: 2023494 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO234955 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.2295798 n/a   a 2.3605932 n/a AU q 1.8186487 n/a AU i 2.41579 n/a deg node 168.22427 n/a deg peri 144.96182 n/a deg M 3.95603 n/a deg tp 2456385.9424857 (2013-Apr-03.44248570) n/a JED period 1324.7384791 3.63 n/a n/a d yr n 0.27175175 n/a deg/d Q 2.9025377 n/a AU   Orbit Determination Parameters    # obs. used (total)      850      first obs. used      1953-??-??      last obs. used      2012-07-23      # oppositions      14      planetary ephem.      DE403      condition code      0      fit RMS      0.50      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.514  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.7 mag n/a PDS3 (MPO 11103)   23494 (1991 SE2)          Discovered 1991-Sep-16 by Holt, H. E. at Palomar (675) Reference: 20010408/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 SE2 = 1994 GM  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 13:15 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin