+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101984 (1999 RB61) Classification: Main-belt Asteroid          SPK-ID: 2101984 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .084813238782342 6.7565e-08   a 2.774891044065487 1.764e-08 au q 2.539543547350179 1.8301e-07 au i 3.304668251474128 4.8226e-06 deg node 121.6099365274344 9.691e-05 deg peri 219.9121127258822 0.00010112 deg M 167.452951295071 3.1427e-05 deg tp 2458215.160149906829 (2018-Apr-06.66014991) 0.00014549 TDB period 1688.368845380055 4.62 1.61e-05 4.408e-08 d yr n .2132235506388791 2.0332e-09 deg/d Q 3.010238540780796 1.9136e-08 au   Orbit Determination Parameters    # obs. used (total)      612      data-arc span      7531 days (20.62 yr)      first obs. used      1999-09-07      last obs. used      2020-04-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56982      source      ORB      producer      Otto Matic      solution date      2020-May-20 18:04:13   Additional Information  Earth MOID = 1.53199 au   Jupiter MOID = 2.30745 au   T_jup = 3.328  [ hide covariance matrix ] Orbital Elements at Epoch 2457158.5 (2015-May-16.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08384502488337618 6.7116e-08   q 2.543360433695684 1.8123e-07 au tp 2456517.412604813254 (2013-Aug-12.91260481) 0.00014546 TDB node 121.6789599177946 9.672e-05 deg peri 218.2242901564272 0.00010114 deg i 3.306465670365537 4.8275e-06 deg   Orbit Determination Parameters    # obs. used (total)      612      data-arc span      7531 days (20.62 yr)      first obs. used      1999-09-07      last obs. used      2020-04-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56982      source      ORB      producer      Otto Matic      solution date      2020-May-20 18:04:13   Additional Information  Jupiter MOID = 2.30745 au   T_jup = 3.328  Orbit Covariance (6×6)   e q tp node peri i e 4.504622362899342E-15 -1.212025209753581E-14 4.341920067949918E-12 -1.245797351540216E-14 7.962377850250406E-13 -2.795603872822289E-15 q -1.212025209753581E-14 3.284521576648002E-14 -1.164607269420249E-11 3.361089581766887E-14 -2.117510987569437E-12 7.619939319733433E-15 tp 4.341920067949918E-12 -1.164607269420249E-11 2.115873497597817E-8 -3.219120526901656E-11 4.339506568835536E-9 -6.089221697607061E-12 node -1.245797351540216E-14 3.361089581766887E-14 -3.219120526901656E-11 9.354725590499199E-9 -9.345215732606583E-9 1.255152411203945E-10 peri 7.962377850250406E-13 -2.117510987569437E-12 4.339506568835536E-9 -9.345215732606583E-9 1.022925383334928E-8 -1.265016324854348E-10 i -2.795603872822289E-15 7.619939319733433E-15 -6.089221697607061E-12 1.255152411203945E-10 -1.265016324854348E-10 2.330473261618323E-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 15.5   n/a MPO351573   101984 (1999 RB61)          Discovered 1999-Sep-07 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 Alternate Designations  1999 RB61 = 2002 CN103  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-19 03:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin