+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120278 (2004 HL17) Classification: Main-belt Asteroid          SPK-ID: 2120278 [ 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 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1593386599196901 4.5917e-08   a 2.269682440264181 1.3952e-08 au q 1.908034281789234 1.0256e-07 au i 6.638663513111451 7.7081e-06 deg node 24.5681718755181 4.2479e-05 deg peri 227.2343760028375 4.8793e-05 deg M 294.3473127302024 2.3515e-05 deg tp 2459428.269768183768 (2021-Aug-01.76976818) 8.154e-05 TDB period 1248.952936369414 3.42 1.1516e-05 3.153e-08 d yr n .2882414457077024 2.6577e-09 deg/d Q 2.631330598739127 1.6175e-08 au   Orbit Determination Parameters    # obs. used (total)      242      data-arc span      8747 days (23.95 yr)      first obs. used      1997-04-03      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .62353      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:05:43   Additional Information  Earth MOID = .900025 au   Jupiter MOID = 2.41489 au   T_jup = 3.588  [ 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 17.0   n/a MPO453673   120278 (2004 HL17)          Discovered 2004-Apr-16 by Siding Spring Survey at Siding Spring Reference: 20051116/Numbers.arc Last Updated: 2005-11-21 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-17 21:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin