+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   70100 (1999 JO121) Classification: Main-belt Asteroid          SPK-ID: 2070100 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1324388423847582 5.1839e-08   a 2.288458418020566 1.1103e-08 au q 1.985377634292268 1.1929e-07 au i 5.843312955658147 4.8451e-06 deg node 230.7531367661779 5.1333e-05 deg peri 342.5110334589348 5.4048e-05 deg M 50.9722107591175 1.8589e-05 deg tp 2458821.462528987874 (2019-Dec-03.96252899) 6.4956e-05 TDB period 1264.482913424281 3.46 9.2025e-06 2.52e-08 d yr n .2847013559282526 2.072e-09 deg/d Q 2.591539201748866 1.2574e-08 au   Orbit Determination Parameters    # obs. used (total)      665      data-arc span      7690 days (21.05 yr)      first obs. used      1999-05-13      last obs. used      2020-06-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57853      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 23:33:41   Additional Information  Earth MOID = .97959 au   Jupiter MOID = 2.38271 au   T_jup = 3.582  [ 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 15.9   n/a MPO426418   diameter diameter 2.177 km 0.240 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.148   0.063 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   70100 (1999 JO121)          Discovered 1999-May-13 by LINEAR at Socorro Reference: 20031109/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 JO121 = 2000 WR159  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-23 14:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin