+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120275 (2004 HB8) Classification: Main-belt Asteroid          SPK-ID: 2120275 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1662760419985848 4.1588e-08   a 2.250913692255997 1.3577e-08 au q 1.876640672627249 9.4572e-08 au i 4.901525740213099 4.4526e-06 deg node 75.53362886001754 5.9805e-05 deg peri 216.4669409761908 6.1956e-05 deg M 195.9667270881453 1.5654e-05 deg tp 2459562.538596900867 (2021-Dec-14.03859690) 5.4518e-05 TDB period 1233.493005977139 3.38 1.116e-05 3.055e-08 d yr n .2918541072025114 2.6405e-09 deg/d Q 2.625186711884745 1.5834e-08 au   Orbit Determination Parameters    # obs. used (total)      366      data-arc span      8844 days (24.21 yr)      first obs. used      1995-10-18      last obs. used      2020-01-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55388      source      ORB      producer      Otto Matic      solution date      2020-Jan-29 17:02:14   Additional Information  Earth MOID = .863111 au   Jupiter MOID = 2.54647 au   T_jup = 3.604  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.6   n/a MPO449700   120275 (2004 HB8)          Discovered 2004-Apr-16 by Spacewatch at Kitt Peak Reference: 20051116/Numbers.arc Last Updated: 2005-11-21 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-31 14:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin