+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   152704 (1998 SD4) Classification: Mars-crossing Asteroid          SPK-ID: 2152704 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO211180 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1253204 n/a   a 1.5148970 n/a AU q 1.3250495 n/a AU i 13.67027 n/a deg node 181.82361 n/a deg peri 144.03522 n/a deg M 323.36756 n/a deg tp 2456469.8005123 (2013-Jun-26.30051230) n/a JED period 681.0407506 1.86 n/a n/a d yr n 0.52860273 n/a deg/d Q 1.7047445 n/a AU   Orbit Determination Parameters    # obs. used (total)      175      first obs. used      1998-??-??      last obs. used      2011-10-25      # oppositions      6      planetary ephem.      DE403      condition code      2      fit RMS      0.58      data source      MPC:mpu      producer      MPCLINUX   Additional Information  T_jup = 4.475  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 18.6 mag n/a MPO211180   152704 (1998 SD4)          Discovered 1998-Sep-17 by Beijing Schmidt CCD Asteroid Program at Xinglong (327) Reference: 20070402/Numbers.arc Last Updated: 2007-04-04 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 14:45 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin