+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   26117 (1991 RX21) Classification: Outer Main-belt Asteroid          SPK-ID: 2026117 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO231600 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1121698 n/a   a 3.2076965 n/a AU q 2.8478898 n/a AU i 14.44197 n/a deg node 158.16652 n/a deg peri 267.99237 n/a deg M 208.14584 n/a deg tp 2457285.6411460 (2015-Sep-20.14114600) n/a JED period 2098.4002845 5.75 n/a n/a d yr n 0.17155926 n/a deg/d Q 3.5675032 n/a AU   Orbit Determination Parameters    # obs. used (total)      678      first obs. used      1991-??-??      last obs. used      2012-05-22      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.55      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.133  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.0 mag n/a PDS3 (MPO 13894)   26117 (1991 RX21)          Discovered 1991-Sep-11 by Holt, H. E. at Palomar (675) Reference: 20010705/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RX21 = 1999 BK23  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 23:02 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin