+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   160921 (2001 XH115) Classification: Main-belt Asteroid          SPK-ID: 2160921 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ 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 .1006722556468719 5.224e-08   a 2.198569219758924 9.3697e-09 au q 1.97723429721001 1.1882e-07 au i 6.744095996402112 3.7929e-06 deg node 311.1621376137797 3.8495e-05 deg peri 53.29115306339171 4.2837e-05 deg M 318.8277008105392 1.651e-05 deg tp 2459136.679351403122 (2020-Oct-14.17935140) 5.4323e-05 TDB period 1190.717241209424 3.26 7.6118e-06 2.084e-08 d yr n .302338781652598 1.9327e-09 deg/d Q 2.419904142307839 1.0313e-08 au   Orbit Determination Parameters    # obs. used (total)      1010      data-arc span      8007 days (21.92 yr)      first obs. used      1998-12-15      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49755      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 23:17:41   Additional Information  Earth MOID = .982049 au   Jupiter MOID = 2.98637 au   T_jup = 3.651  [ hide covariance matrix ] Orbital Elements at Epoch 2458018.5 (2017-Sep-22.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1013031394579234 5.2241e-08   q 1.975685321484226 1.1894e-07 au tp 2457947.172285123812 (2017-Jul-12.67228512) 5.6756e-05 TDB node 311.1947936712645 3.8529e-05 deg peri 53.59466258023846 4.2809e-05 deg i 6.741340952058354 3.7916e-06 deg   Orbit Determination Parameters    # obs. used (total)      1010      data-arc span      8007 days (21.92 yr)      first obs. used      1998-12-15      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49755      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 23:17:41   Additional Information  Jupiter MOID = 2.98637 au   T_jup = 3.651  Orbit Covariance (6×6)   e q tp node peri i e 2.72909014164461E-15 -6.20124185139618E-15 3.753868441151643E-13 3.753603318107788E-14 5.797815599423542E-14 -7.682462961546038E-15 q -6.20124185139618E-15 1.41477568063962E-14 -1.036734467160058E-12 -8.378589891521703E-14 -1.906620130769059E-13 1.78686300367903E-14 tp 3.753868441151643E-13 -1.036734467160058E-12 3.221276668876756E-9 -1.706165938694289E-11 1.078933600192081E-9 -3.455362259413552E-12 node 3.753603318107788E-14 -8.378589891521703E-14 -1.706165938694289E-11 1.484454772972908E-9 -1.480029471101589E-9 7.752569581037927E-11 peri 5.797815599423542E-14 -1.906620130769059E-13 1.078933600192081E-9 -1.480029471101589E-9 1.832632733087278E-9 -7.807226400117775E-11 i -7.682462961546038E-15 1.78686300367903E-14 -3.455362259413552E-12 7.752569581037927E-11 -7.807226400117775E-11 1.437620792389314E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.1   n/a MPO436811   diameter diameter 1.811 km 0.505 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.258   0.121 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   160921 (2001 XH115)          Discovered 2001-Dec-13 by LINEAR at Socorro Reference: 20070828/Numbers.arc Last Updated: 2007-08-30 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-19 10:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin