+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   21043 (1990 RT2) Classification: Main-belt Asteroid          SPK-ID: 2021043 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250420 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1696630 n/a   a 2.7004631 n/a AU q 2.2422944 n/a AU i 11.99850 n/a deg node 356.60245 n/a deg peri 15.86362 n/a deg M 22.92985 n/a deg tp 2456297.2584554 (2013-Jan-04.75845540) n/a JED period 1620.8983505 4.44 n/a n/a d yr n 0.22209906 n/a deg/d Q 3.1586318 n/a AU   Orbit Determination Parameters    # obs. used (total)      676      first obs. used      1981-??-??      last obs. used      2013-01-20      # oppositions      14      planetary ephem.      DE403      condition code      0      fit RMS      0.52      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.316  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.3 mag n/a PDS3 (MPO 8624)   21043 (1990 RT2)          Discovered 1990-Sep-15 by Holt, H. E. at Palomar (675) Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1990 RT2 = 1981 RT7  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-23 10:19 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin