+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   15285 (1991 RW18) Classification: Main-belt Asteroid          SPK-ID: 2015285 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO247498 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1107445 n/a   a 3.0610536 n/a AU q 2.7220587 n/a AU i 4.87251 n/a deg node 268.50737 n/a deg peri 96.55901 n/a deg M 359.79590 n/a deg tp 2456401.6090352 (2013-Apr-19.10903520) n/a JED period 1956.1619754 5.36 n/a n/a d yr n 0.18403384 n/a deg/d Q 3.4000485 n/a AU   Orbit Determination Parameters    # obs. used (total)      550      first obs. used      1991-??-??      last obs. used      2012-12-02      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.56      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.219  [ 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 848)   15285 (1991 RW18)          Discovered 1991-Sep-14 by Holt, H. E. at Palomar (675) Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RW18 = 1997 WL33 = 1999 CN66  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 11:57 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin