+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   308242 (2005 GO21) Classification: Aten [NEO, PHA]          SPK-ID: 2308242 [ 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 55 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3399033575334342 1.9536e-07   a .7533075821016776 1.2381e-08 AU q .4972558056899242 1.4838e-07 AU i 24.92574641666005 1.7843e-05 deg node 272.7069155281416 6.7639e-06 deg peri 156.61014557 3.7503e-05 deg M 311.9194988604801 7.7982e-05 deg tp 2456432.395059725854 (2013-May-19.89505973) 5.2234e-05 JED period 238.8124339217723 0.65 5.8876e-06 1.612e-08 d yr n 1.507459197530415 3.7164e-08 deg/d Q 1.009359358513431 1.659e-08 AU   Orbit Determination Parameters    # obs. used (total)      131      # delay obs. used      5      # Doppler obs. used      2      data-arc span      2658 days (7.28 yr)      first obs. used      2005-04-01      last obs. used      2012-07-11      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .44187      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 15:41:34   Additional Information  Earth MOID = .0436676 AU   T_jup = 7.556  [ 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 16.397 mag .36999 37 autocmod 2.5b rotation period rot_per 11.00 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Benner, L.A.M. http://echo.jpl.nasa.gov/asteroids/2005GO21/2 005GO21_planning.html] [Higgins, D.J. (2012) http://www.david-higgins.com/Astronomy/astero id/lightcurves.htm] 308242 (2005 GO21)          Discovered 2005-Apr-01 by Siding Spring Survey at Siding Spring (E12) Reference: 20111210/Numbers.arc Last Updated: 2011-12-12 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-23 10:39 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin