+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2021 AS2) Classification: Apollo [NEO]          SPK-ID: 54104849 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459223.5 (2021-Jan-09.0) TDB Reference: JPL 3 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .7796270556108247 0.00060908   a 2.291396340090741 0.0053814 au q .5049617582283766 0.00021018 au i .8285886629857554 0.000755 deg node 108.6404031062823 6.0661e-05 deg peri 96.80182244199986 0.0015867 deg M 347.3814293828511 0.050173 deg tp 2459267.907508870615 (2021-Feb-22.40750887) 0.020132 TDB period 1266.918708819143 3.47 4.4631 0.01222 d yr n .2841539851720599 0.001001 deg/d Q 4.077830921953105 0.009577 au   Orbit Determination Parameters    # obs. used (total)      20      data-arc span      1 day      first obs. used      2021-01-08      last obs. used      2021-01-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      8      norm. resid. RMS      .2947      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 23:22:39   Additional Information  Earth MOID = .000156755 au   Jupiter MOID = .881776 au   T_jup = 3.102  [ 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 29.51   .37699 E2021D54 autocmod 2.8 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Apr-16 17:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin