+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   20461 Dioretsa (1999 LD31) Classification: Centaur          SPK-ID: 2020461 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 3 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .9002690397127281 4.358e-06   a 23.76772091083161 0.0010514 AU q 2.370377630277109 1.5481e-06 AU i 160.4051700495105 2.3632e-05 deg node 297.2423644653146 7.9209e-05 deg peri 102.3645483378648 0.00014095 deg M 41.71861640721651 0.0027688 deg tp 2451495.860047147399 (1999-Nov-13.36004715) 0.00037131 JED period 42323.32073988699 115.87 2.8084 0.007689 d yr n .008505948817497283 5.6441e-07 deg/d Q 45.1650641913861 0.0019979 AU   Orbit Determination Parameters    # obs. used (total)      280      data-arc span      927 days (2.54 yr)      first obs. used      1998-06-16      last obs. used      2000-12-29      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      2      fit RMS      .44567      data source      ORB      producer      Otto Matic      solution date      2011-Sep-14 19:03:46   Additional Information  Earth MOID = 1.46213 AU   T_jup = -1.534  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.8 mag n/a PDS3 (MPO 7841)   20461 Dioretsa           Discovered 1999 June 8 by the Lincoln Laboratory Near Earth Asteroid Research Team at Socorro. As befits the first numbered asteroid in a retrograde orbit, Dioretsa is the word asteroid spelled backwards. The name was suggested independently by K. Kitterman and S. Cooksey of Flagstaff, Arizona. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030501/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-Jun-18 06:39 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin