+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   226978 (2004 XB20) Classification: Main-belt Asteroid          SPK-ID: 2226978 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1380873439149573 5.2519e-08   a 2.965090717967202 2.6715e-08 au q 2.555649216256218 1.5193e-07 au i 8.386293053372526 5.4904e-06 deg node 249.1696758710954 2.9222e-05 deg peri 123.3547548441424 3.4655e-05 deg M 63.94177193028838 1.7575e-05 deg tp 2458669.263969736984 (2019-Jul-04.76396974) 9.0655e-05 TDB period 1864.899381028898 5.11 2.5204e-05 6.9e-08 d yr n .1930399053494144 2.6089e-09 deg/d Q 3.374532219678187 3.0404e-08 au   Orbit Determination Parameters    # obs. used (total)      488      data-arc span      7823 days (21.42 yr)      first obs. used      1998-08-27      last obs. used      2020-01-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50551      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 06:01:06   Additional Information  Earth MOID = 1.56862 au   Jupiter MOID = 2.15072 au   T_jup = 3.234  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.3   n/a MPO454631   diameter diameter 3.038 km 0.336 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.145   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   226978 (2004 XB20)          Discovered 2004-Dec-08 by LINEAR at Socorro Reference: 20091202/Numbers.arc Last Updated: 2009-12-04 [ show close-approach data ] Alternate Designations  2004 XB20 = 2008 OB7 = 2009 QT50  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-07 01:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin