+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   264281 (1998 DO31) Classification: Main-belt Asteroid          SPK-ID: 2264281 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO190767 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1605388 n/a   a 2.6251016 n/a AU q 2.2036709 n/a AU i 11.80131 n/a deg node 345.67150 n/a deg peri 114.65180 n/a deg M 232.59800 n/a deg tp 2456950.2830441 (2014-Oct-19.78304410) n/a JED period 1553.5226752 4.25 n/a n/a d yr n 0.23173141 n/a deg/d Q 3.0465323 n/a AU   Orbit Determination Parameters    # obs. used (total)      109      first obs. used      1998-??-??      last obs. used      2011-02-08      # oppositions      5      planetary ephem.      DE403      condition code      1      fit RMS      0.52      data source      MPC:mpu      producer      MPCADO   Additional Information  T_jup = 3.355  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.4 mag n/a MPC30261   264281 (1998 DO31)          Discovered 1998-Feb-23 by Beijing Schmidt CCD Asteroid Program at Xinglong (327) Reference: 20110218/Numbers.arc Last Updated: 2011-02-22 Alternate Designations  1998 DO31 = 2001 YG138  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-20 03:26 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin