+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   4749 (1989 WE1) Classification: Main-belt Asteroid          SPK-ID: 2004749 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO244221 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1047600 n/a   a 3.0090442 n/a AU q 2.6938167 n/a AU i 10.75473 n/a deg node 93.09688 n/a deg peri 284.97415 n/a deg M 215.07689 n/a deg tp 2457167.9965411 (2015-May-25.49654110) n/a JED period 1906.5196352 5.22 n/a n/a d yr n 0.18882575 n/a deg/d Q 3.3242717 n/a AU   Orbit Determination Parameters    # obs. used (total)      816      first obs. used      1976-??-??      last obs. used      2012-06-18      # oppositions      19      planetary ephem.      DE403      condition code      0      fit RMS      0.57      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.215  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.6 mag n/a PDS3 (MPC 28112)   4749 (1989 WE1)          Discovered 1989-Nov-22 by Kawasato, N. at Uenohara Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1989 WE1 = 1976 HJ = 1978 TG  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-26 05:12 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin