+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2021 AD4) Classification: Aten [NEO]          SPK-ID: 54105103 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 5 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08555089452200473 8.0286e-05   a .9094931095976657 6.3349e-05 au q .8316851605099858 0.00013095 au i 9.482701148452509 0.010078 deg node 106.7579253333104 0.0012991 deg peri 194.3594321707973 0.0013918 deg M 273.4600405103827 0.026882 deg tp 2459076.657334154456 (2020-Aug-15.15733415) 0.015702 TDB period 316.809026226705 0.87 0.0331 9.062e-05 d yr n 1.136331260152885 0.00011872 deg/d Q .9873010586853457 6.8768e-05 au   Orbit Determination Parameters    # obs. used (total)      42      data-arc span      9 days      first obs. used      2021-01-09      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      6      norm. resid. RMS      .44989      source      ORB      producer      Otto Matic      solution date      2021-Jan-19 05:27:48   Additional Information  Earth MOID = .00122592 au   Jupiter MOID = 4.07112 au   T_jup = 6.543  [ 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 25.66   .29006 E2021B69 autocmod 2.8 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-02 08:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin