+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2018 HB) Classification: Aten [NEO]          SPK-ID: 3803895 [ 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 5 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5885680324912961 0.0021815   a .8101639890725125 0.00021507 au q .3333273640288039 0.0018557 au i 22.07995472621771 0.19495 deg node 14.39473738541995 0.014041 deg peri 354.823652771923 0.0070964 deg M 95.27897644553094 0.58672 deg tp 2459130.005958131612 (2020-Oct-07.50595813) 0.40602 TDB period 266.3531454615022 0.73 0.10606 0.0002904 d yr n 1.351589069377194 0.00053821 deg/d Q 1.287000614116221 0.00034166 au   Orbit Determination Parameters    # obs. used (total)      35      data-arc span      24 days      first obs. used      2018-04-16      last obs. used      2018-05-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      7      norm. resid. RMS      .34688      source      ORB      producer      Otto Matic      solution date      2018-May-10 06:43:32   Additional Information  Earth MOID = .180185 au   Jupiter MOID = 4.17667 au   T_jup = 7.014  [ 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 22.2   n/a MPO450738   [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-04 20:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin