+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101933 (1999 RS21) Classification: Main-belt Asteroid          SPK-ID: 2101933 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1226049169628643 3.9234e-08   a 2.237763166909824 8.2024e-09 au q 1.963402399648289 8.9714e-08 au i 5.360495582305879 4.0765e-06 deg node 149.4528426538417 3.776e-05 deg peri 206.7972218899488 4.0977e-05 deg M 66.49236425501466 1.4121e-05 deg tp 2458774.666230703829 (2019-Oct-18.16623070) 4.8225e-05 TDB period 1222.699145345705 3.35 6.7226e-06 1.841e-08 d yr n .2944305648452988 1.6188e-09 deg/d Q 2.512123934171359 9.208e-09 au   Orbit Determination Parameters    # obs. used (total)      738      data-arc span      7766 days (21.26 yr)      first obs. used      1999-08-12      last obs. used      2020-11-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53939      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 22:29:45   Additional Information  Earth MOID = .960048 au   Jupiter MOID = 2.90428 au   T_jup = 3.621  [ hide covariance matrix ] Orbital Elements at Epoch 2457274.5 (2015-Sep-09.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1235357796256098 3.9311e-08   q 1.960977554734063 8.9982e-08 au tp 2457551.907040662490 (2016-Jun-12.40704066) 4.9554e-05 TDB node 149.5152191504008 3.7757e-05 deg peri 206.7351662554434 4.091e-05 deg i 5.361118453747821 4.0776e-06 deg   Orbit Determination Parameters    # obs. used (total)      738      data-arc span      7766 days (21.26 yr)      first obs. used      1999-08-12      last obs. used      2020-11-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53939      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 22:29:45   Additional Information  Jupiter MOID = 2.90428 au   T_jup = 3.621  Orbit Covariance (6×6)   e q tp node peri i e 1.545348412744861E-15 -3.526533159891087E-15 8.361737747084712E-14 1.90460857357857E-15 3.328872369444887E-14 -1.032951740033542E-17 q -3.526533159891087E-15 8.096736211754926E-15 -3.12274090640364E-13 -4.498707095191833E-15 -1.163759883477222E-13 2.318975119914802E-16 tp 8.361737747084712E-14 -3.12274090640364E-13 2.455620931418523E-9 -9.627885258708949E-12 7.902452090566159E-10 -1.395245455162664E-12 node 1.90460857357857E-15 -4.498707095191833E-15 -9.627885258708949E-12 1.425597794694953E-9 -1.421675214319211E-9 1.751953051537474E-11 peri 3.328872369444887E-14 -1.163759883477222E-13 7.902452090566159E-10 -1.421675214319211E-9 1.673587971832712E-9 -1.792505695898134E-11 i -1.032951740033542E-17 2.318975119914802E-16 -1.395245455162664E-12 1.751953051537474E-11 -1.792505695898134E-11 1.662654380629237E-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 MPO436477   101933 (1999 RS21)          Discovered 1999-Sep-07 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 Alternate Designations  1999 RS21 = 2001 FU102  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-18 08:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin