+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   17485 (1991 RP9) Classification: Main-belt Asteroid          SPK-ID: 2017485 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250385 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1100020 n/a   a 2.5274233 n/a AU q 2.2494017 n/a AU i 16.18303 n/a deg node 50.46010 n/a deg peri 20.27463 n/a deg M 38.68652 n/a deg tp 2456242.7851589 (2012-Nov-11.28515890) n/a JED period 1467.6260049 4.02 n/a n/a d yr n 0.24529410 n/a deg/d Q 2.8054449 n/a AU   Orbit Determination Parameters    # obs. used (total)      691      first obs. used      1953-??-??      last obs. used      2013-01-09      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.51      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.389  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.4 mag n/a PDS3 (MPO 4064)   17485 (1991 RP9)          Discovered 1991-Sep-05 by McNaught, R. H. at Siding Spring (413) Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RP9 = 1998 HM144  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-20 04:39 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin