+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   23973 (1999 CA4) Classification: Main-belt Asteroid          SPK-ID: 2023973 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO257036 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0977426 n/a   a 3.0208328 n/a AU q 2.7255687 n/a AU i 10.12955 n/a deg node 17.03031 n/a deg peri 281.24053 n/a deg M 115.21672 n/a deg tp 2455786.7359194 (2011-Aug-13.23591940) n/a JED period 1917.7344141 5.25 n/a n/a d yr n 0.18772151 n/a deg/d Q 3.3160969 n/a AU   Orbit Determination Parameters    # obs. used (total)      956      first obs. used      1952-??-??      last obs. used      2013-03-13      # oppositions      17      planetary ephem.      DE403      condition code      0      fit RMS      0.51      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.215  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.9 mag n/a PDS3 (MPO 11259)   23973 (1999 CA4)          Discovered 1999-Feb-05 by Beijing Schmidt CCD Asteroid Program at Xinglong (327) Reference: 20010408/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 CA4 = 1991 UG  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-18 09:48 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin