+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120276 (2004 HU9) Classification: Main-belt Asteroid          SPK-ID: 2120276 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1332286529876712 5.1734e-08   a 2.291518221247662 1.0021e-08 au q 1.986222335334132 1.1947e-07 au i 4.58613539714233 4.7529e-06 deg node 14.61786399533344 5.9469e-05 deg peri 160.5224488154201 6.1722e-05 deg M 320.095536723518 1.8605e-05 deg tp 2459340.943735529174 (2021-May-06.44373553) 6.5702e-05 TDB period 1267.019792753367 3.47 8.3108e-06 2.275e-08 d yr n .2841313151215123 1.8637e-09 deg/d Q 2.596814107161192 1.1356e-08 au   Orbit Determination Parameters    # obs. used (total)      387      data-arc span      9233 days (25.28 yr)      first obs. used      1995-10-15      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54261      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 09:24:36   Additional Information  Earth MOID = .990735 au   Jupiter MOID = 2.36365 au   T_jup = 3.582  [ 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 16.7   n/a MPO280589   120276 (2004 HU9)          Discovered 2004-Apr-17 by LINEAR at Socorro Reference: 20051116/Numbers.arc Last Updated: 2005-11-21 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-08 13:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin