+ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1324388313449569 5.0583e-08   a 2.288458419737507 1.0952e-08 au q 1.985377661045945 1.1607e-07 au i 5.843313362931243 4.7794e-06 deg node 230.753133158542 5.0807e-05 deg peri 342.5110391405565 5.3502e-05 deg M 50.97220752349212 1.8293e-05 deg tp 2458821.462540151367 (2019-Dec-03.96254015) 6.3949e-05 TDB period 1264.482914847319 3.46 9.0773e-06 2.485e-08 d yr n .2847013556078522 2.0438e-09 deg/d Q 2.59153917842907 1.2403e-08 au   Orbit Determination Parameters    # obs. used (total)      683      data-arc span      7732 days (21.17 yr)      first obs. used      1999-05-13      last obs. used      2020-07-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57372      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 22:02:07   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 ] 2021-Jan-19 06:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin