+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2018 PD9) Classification: Apollo [NEO]          SPK-ID: 3826652 [ 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 4 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2667121878447634 0.00030173   a 1.316650078216618 0.00048017 au q .9654834552294852 4.5227e-05 au i 1.03055552766122 0.0008712 deg node 121.2435389989901 0.00079629 deg peri 144.6520978387419 0.0010357 deg M 231.1970653941026 0.32748 deg tp 2459397.936406527072 (2021-Jul-02.43640653) 0.60998 TDB period 551.8283148378795 1.51 0.30187 0.0008265 d yr n .6523768177893583 0.00035687 deg/d Q 1.667816701203751 0.00060823 au   Orbit Determination Parameters    # obs. used (total)      24      data-arc span      7 days      first obs. used      2018-08-07      last obs. used      2018-08-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      7      norm. resid. RMS      .49988      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 20:34:56   Additional Information  Earth MOID = .001654 au   Jupiter MOID = 3.40815 au   T_jup = 4.921  [ 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 27.4   .32676 MPO452044 autocmod 2.6n [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Apr-21 21:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin