+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103167 (1999 XS228) Classification: Main-belt Asteroid          SPK-ID: 2103167 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1663198935042162 4.4599e-08   a 2.185680238798538 6.7674e-09 au q 1.822158134247295 9.7744e-08 au i 4.380937006037684 3.628e-06 deg node 298.8191576415109 6.0949e-05 deg peri 86.34343134136162 6.1882e-05 deg M 237.7553337598866 1.1835e-05 deg tp 2459601.279762751189 (2022-Jan-21.77976275) 3.9631e-05 TDB period 1180.261839048514 3.23 5.4815e-06 1.501e-08 d yr n .3050170632393059 1.4166e-09 deg/d Q 2.549202343349781 7.8929e-09 au   Orbit Determination Parameters    # obs. used (total)      871      data-arc span      8500 days (23.27 yr)      first obs. used      1997-02-07      last obs. used      2020-05-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48868      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:50:21   Additional Information  Earth MOID = .831047 au   Jupiter MOID = 2.91915 au   T_jup = 3.655  [ 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 16.02   n/a E2021B55   diameter diameter 3.560 km 0.093 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.067   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   103167 (1999 XS228)          Discovered 1999-Dec-14 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 XS228 = 2002 TW289  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-04 19:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin