+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2021 AK3) Classification: Apollo [NEO]          SPK-ID: 54104902 [ 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 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4357097357888984 3.9315e-05   a 1.359135126766452 7.1607e-05 au q .7669467197816302 1.3362e-05 au i 18.37574344152387 0.0019493 deg node 249.4776892243947 0.001217 deg peri 325.3599592107688 0.0013136 deg M 287.4172068567687 0.0061155 deg tp 2459317.187291230174 (2021-Apr-12.68729123) 0.00067209 TDB period 578.751836677976 1.58 0.045738 0.0001252 d yr n .6220282635583375 4.9158e-05 deg/d Q 1.951323533751273 0.00010281 au   Orbit Determination Parameters    # obs. used (total)      53      data-arc span      55 days      first obs. used      2021-01-07      last obs. used      2021-03-03      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      6      norm. resid. RMS      .48017      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 23:22:42   Additional Information  Earth MOID = .171638 au   Jupiter MOID = 3.08181 au   T_jup = 4.702  [ 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 21.4   .34458 E2021D54 autocmod 2.8 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Apr-22 12:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin