+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   17621 (1995 WD1) Classification: Main-belt Asteroid          SPK-ID: 2017621 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO231538 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1355437 n/a   a 2.8519084 n/a AU q 2.4653502 n/a AU i 2.46992 n/a deg node 195.78306 n/a deg peri 216.33780 n/a deg M 227.78320 n/a deg tp 2457046.5794508 (2015-Jan-24.07945080) n/a JED period 1759.1456025 4.82 n/a n/a d yr n 0.20464480 n/a deg/d Q 3.2384666 n/a AU   Orbit Determination Parameters    # obs. used (total)      585      first obs. used      1995-??-??      last obs. used      2012-05-20      # oppositions      12      planetary ephem.      DE403      condition code      0      fit RMS      0.55      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.290  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.4 mag n/a PDS3 (MPO 4103)   17621 (1995 WD1)          Discovered 1995-Nov-16 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 00:09 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin