+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   117339 (2004 XO20) Classification: Main-belt Asteroid          SPK-ID: 2117339 [ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07313523695114829 4.0399e-08   a 3.193156172512245 3.2808e-08 au q 2.95962393921354 1.3513e-07 au i 14.4583791026277 4.6734e-06 deg node 78.73452856254248 2.123e-05 deg peri 30.93432444375114 4.4137e-05 deg M 228.64487772298 3.7935e-05 deg tp 2459760.954402989743 (2022-Jun-30.45440299) 0.00022081 TDB period 2084.14853056858 5.71 3.212e-05 8.794e-08 d yr n .1727324107278418 2.6621e-09 deg/d Q 3.42668840581095 3.5207e-08 au   Orbit Determination Parameters    # obs. used (total)      862      data-arc span      7205 days (19.73 yr)      first obs. used      1998-10-19      last obs. used      2018-07-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54345      source      ORB      producer      Otto Matic      solution date      2018-Oct-04 04:36:08   Additional Information  Earth MOID = 1.9854 au   Jupiter MOID = 1.81744 au   T_jup = 3.143  [ 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 14.0   n/a MPO449686   diameter diameter 9.021 km 0.276 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.060   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   117339 (2004 XO20)          Discovered 2004-Dec-08 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  2004 XO20 = 2000 EW121  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-11 09:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin