+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   23491 (1991 RX17) Classification: Main-belt Asteroid          SPK-ID: 2023491 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250441 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1423611 n/a   a 2.3178564 n/a AU q 1.9878838 n/a AU i 4.36627 n/a deg node 177.63418 n/a deg peri 148.65514 n/a deg M 61.17008 n/a deg tp 2456181.4895842 (2012-Sep-10.98958420) n/a JED period 1288.9267054 3.53 n/a n/a d yr n 0.27930215 n/a deg/d Q 2.6478290 n/a AU   Orbit Determination Parameters    # obs. used (total)      1160      first obs. used      1949-??-??      last obs. used      2012-12-10      # oppositions      14      planetary ephem.      DE403      condition code      0      fit RMS      0.58      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.562  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.0 mag n/a PDS3 (MPO 11102)   23491 (1991 RX17)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar (675) Reference: 20010408/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RX17 = 1991 PV10 = 1998 MS46  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 23:39 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin