+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2021 DX) Classification: Apollo [NEO]          SPK-ID: 54123267 [ 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 7 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .183797174297151 0.00014156   a 1.242170804313694 0.00021113 au q 1.013863320486418 6.4803e-06 au i 8.468463392111145 0.0058338 deg node 174.5036598718883 0.004153 deg peri 56.12055940281842 0.0075249 deg M 252.3854819534121 0.023511 deg tp 2459351.660655779664 (2021-May-17.16065578) 0.0078103 TDB period 505.6737424324164 1.38 0.12892 0.000353 d yr n .7119214817607704 0.00018151 deg/d Q 1.47047828814097 0.00024993 au   Orbit Determination Parameters    # obs. used (total)      40      data-arc span      18 days      first obs. used      2021-02-17      last obs. used      2021-03-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      6      norm. resid. RMS      .34193      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 23:26:07   Additional Information  Earth MOID = .0669294 au   Jupiter MOID = 3.51592 au   T_jup = 5.139  [ 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 24.48   .33484 E2021D74 autocmod 2.8 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Apr-21 20:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin