+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101818 (1999 JD13) Classification: Mars-crossing Asteroid          SPK-ID: 2101818 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2671139613265877 4.3339e-08   a 2.191785643281681 8.6434e-09 au q 1.606329097725968 9.7816e-08 au i 5.673813329543702 6.4177e-06 deg node 219.9648866126803 4.0831e-05 deg peri 54.37738982061187 4.2934e-05 deg M 187.5448492503492 1.6796e-05 deg tp 2459568.265779333203 (2021-Dec-19.76577933) 5.7645e-05 TDB period 1185.210645616897 3.24 7.0109e-06 1.919e-08 d yr n .3037434749099992 1.7967e-09 deg/d Q 2.777242188837394 1.0952e-08 au   Orbit Determination Parameters    # obs. used (total)      455      data-arc span      7563 days (20.71 yr)      first obs. used      1999-05-14      last obs. used      2020-01-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55733      source      ORB      producer      Otto Matic      solution date      2020-Feb-24 01:27:03   Additional Information  Earth MOID = .598707 au   Jupiter MOID = 2.35815 au   T_jup = 3.619  [ hide covariance matrix ] Orbital Elements at Epoch 2457118.5 (2015-Apr-06.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2669261657351341 4.3259e-08   q 1.606432610103496 9.7579e-08 au tp 2457198.412146320090 (2015-Jun-24.91214632) 4.8754e-05 TDB node 219.9748085853994 4.0827e-05 deg peri 54.41268095086593 4.2943e-05 deg i 5.673861036606403 6.4187e-06 deg   Orbit Determination Parameters    # obs. used (total)      455      data-arc span      7563 days (20.71 yr)      first obs. used      1999-05-14      last obs. used      2020-01-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55733      source      ORB      producer      Otto Matic      solution date      2020-Feb-24 01:27:03   Additional Information  Jupiter MOID = 2.35815 au   T_jup = 3.619  Orbit Covariance (6×6)   e q tp node peri i e 1.871381825707751E-15 -4.21393581706489E-15 -1.006116215643303E-12 -1.938591953138586E-14 -2.812291391510402E-13 -4.73969512101616E-16 q -4.21393581706489E-15 9.521703193077827E-15 2.373840562659956E-12 4.427482678149831E-14 6.595501800662693E-13 1.440339564254089E-15 tp -1.006116215643303E-12 2.373840562659956E-12 2.376958077059869E-9 2.242343981707171E-11 6.587073255154776E-10 3.821236676473765E-13 node -1.938591953138586E-14 4.427482678149831E-14 2.242343981707171E-11 1.666837481881586E-9 -1.651352697365708E-9 -1.908319260118119E-11 peri -2.812291391510402E-13 6.595501800662693E-13 6.587073255154776E-10 -1.651352697365708E-9 1.844116831580111E-9 1.921931944423672E-11 i -4.73969512101616E-16 1.440339564254089E-15 3.821236676473765E-13 -1.908319260118119E-11 1.921931944423672E-11 4.119913669680756E-11 [ 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 16.6   n/a MPO436476   101818 (1999 JD13)          Discovered 1999-May-14 by Tholen, D. J., Whiteley, R. at Mauna Kea Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 02:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin