+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   48439 (1989 WR2) Classification: Main-belt Asteroid          SPK-ID: 2048439 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .241310531841904 7.8525e-08   a 2.684915804669853 2.4217e-08 AU q 2.037017343894237 2.1031e-07 AU i 13.2870076853013 1.1856e-05 deg node 54.69117200924805 2.9561e-05 deg peri 34.14455804246582 3.8793e-05 deg M 91.73583346031555 2.0883e-05 deg tp 2455991.021650382769 (2012-Mar-04.52165038) 9.3041e-05 JED period 1606.920657956119 4.40 2.1741e-05 5.952e-08 d yr n .22403097391124 3.0311e-09 deg/d Q 3.332814265445469 3.0061e-08 AU   Orbit Determination Parameters    # obs. used (total)      649      data-arc span      9459 days (25.90 yr)      first obs. used      1987-05-30      last obs. used      2013-04-22      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .52763      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 16:17:26   Additional Information  Earth MOID = 1.06559 AU   T_jup = 3.295  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.37 mag .4752 1 autocmod 2.5c 48439 (1989 WR2)          Discovered 1989-Nov-20 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 20021120/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1989 WR2 = 1987 KR3 = 1998 XW38 = 2000 HL57  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-20 12:43 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin