+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2017 SP21) Classification: Aten [NEO]          SPK-ID: 3782060 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 2 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1390064085421141 4.4281e-05   a .9810028182940118 1.2902e-05 au q .844637139753269 3.2483e-05 au i 11.19209627773544 0.0034885 deg node 188.1936096522071 0.00010144 deg peri 69.12368111216317 0.0066166 deg M 204.8659542237804 0.036478 deg tp 2459353.435542293093 (2021-May-18.93554229) 0.038977 TDB period 354.8982104478389 0.97 0.0070013 1.917e-05 d yr n 1.014375360038371 2.0011e-05 deg/d Q 1.117368496834755 1.4695e-05 au   Orbit Determination Parameters    # obs. used (total)      31      data-arc span      2 days      first obs. used      2017-09-30      last obs. used      2017-10-02      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      5      norm. resid. RMS      .56142      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 19:37:46   Additional Information  Earth MOID = .00803513 au   Jupiter MOID = 3.89776 au   T_jup = 6.148  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 27.8   n/a MPO421454   [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Apr-18 05:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin