+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   13502 (1987 WD) Classification: Main-belt Asteroid          SPK-ID: 2013502 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO236467 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1546474 n/a   a 2.3997107 n/a AU q 2.0286017 n/a AU i 8.94854 n/a deg node 13.66923 n/a deg peri 308.05313 n/a deg M 8.93297 n/a deg tp 2456366.8077415 (2013-Mar-15.30774150) n/a JED period 1357.8029541 3.72 n/a n/a d yr n 0.26513420 n/a deg/d Q 2.7708197 n/a AU   Orbit Determination Parameters    # obs. used (total)      742      first obs. used      1987-??-??      last obs. used      2012-08-09      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.55      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.494  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.6 mag n/a PDS3 (MPC 38316)   13502 (1987 WD)          Discovered 1987-Nov-17 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 20000222/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1987 WD = 1983 TJ = 1997 GZ42  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 07:09 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin