+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1663128017602293 4.1587e-08   a 2.250677427636639 1.361e-08 au q 1.876360958787884 9.4551e-08 au i 4.901362527556421 4.4525e-06 deg node 75.5284350575956 5.9813e-05 deg peri 216.5191615788074 6.1963e-05 deg M 254.2838834578758 1.5726e-05 deg tp 2459562.665444346418 (2021-Dec-14.16544435) 5.4496e-05 TDB period 1233.29880276825 3.38 1.1187e-05 3.063e-08 d yr n .2919000644385185 2.6478e-09 deg/d Q 2.624993896485395 1.5874e-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 = .860899 au   Jupiter MOID = 2.54607 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 ] 2021-Mar-07 07:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin