+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   359276 (2009 HR4) Classification: Main-belt Asteroid          SPK-ID: 2359276 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03524177840922284 6.476e-08   a 2.607815594196952 2.4385e-08 au q 2.515911534894147 1.5927e-07 au i 3.175066263566432 4.6353e-06 deg node 121.526040174523 0.00014644 deg peri 171.1726430306593 0.00018765 deg M 139.8057432465421 0.00011818 deg tp 2458403.139838459633 (2018-Oct-11.63983846) 0.0005045 TDB period 1538.20331812335 4.21 2.1575e-05 5.907e-08 d yr n .2340392819066402 3.2827e-09 deg/d Q 2.699719653499757 2.5245e-08 au   Orbit Determination Parameters    # obs. used (total)      130      data-arc span      6731 days (18.43 yr)      first obs. used      2001-05-29      last obs. used      2019-11-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .6213      source      ORB      producer      Otto Matic      solution date      2019-Dec-04 23:25:08   Additional Information  Earth MOID = 1.4998 au   Jupiter MOID = 2.35015 au   T_jup = 3.408  [ hide covariance matrix ] Orbital Elements at Epoch 2457405.5 (2016-Jan-18.0) TDB Reference: JPL 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03675307122240488 6.4559e-08   q 2.511275347912726 1.5896e-07 au tp 2456866.618882183896 (2014-Jul-28.11888218) 0.00048446 TDB node 121.591262925136 0.00014649 deg peri 171.4347024457637 0.00018492 deg i 3.174831885237962 4.6348e-06 deg   Orbit Determination Parameters    # obs. used (total)      130      data-arc span      6731 days (18.43 yr)      first obs. used      2001-05-29      last obs. used      2019-11-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .6213      source      ORB      producer      Otto Matic      solution date      2019-Dec-04 23:25:08   Additional Information  Jupiter MOID = 2.35015 au   T_jup = 3.408  Orbit Covariance (6×6)   e q tp node peri i e 4.167866751101043E-15 -1.017385329172504E-14 1.853533051805504E-13 3.883208888291407E-15 -1.990742378942752E-13 1.821158716115947E-15 q -1.017385329172504E-14 2.526684447237524E-14 -4.747117337382066E-13 -5.452454723947558E-15 5.077611039987588E-13 -4.113748579081516E-15 tp 1.853533051805504E-13 -4.747117337382066E-13 2.346987397000124E-7 -2.527533371772418E-10 5.474599948289378E-8 -4.482752506341489E-11 node 3.883208888291407E-15 -5.452454723947558E-15 -2.527533371772418E-10 2.145955697953167E-8 -2.148474040442581E-8 -1.858032056843835E-11 peri -1.990742378942752E-13 5.077611039987588E-13 5.474599948289378E-8 -2.148474040442581E-8 3.419498192108687E-8 8.070520342807803E-12 i 1.821158716115947E-15 -4.113748579081516E-15 -4.482752506341489E-11 -1.858032056843835E-11 8.070520342807803E-12 2.14814898084897E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 17.2   n/a MPO503415   359276 (2009 HR4)          Discovered 2009-Apr-17 by Spacewatch at Kitt Peak Reference: 20130327/Numbers.arc Last Updated: 2013-03-29 Alternate Designations  2009 HR4 = 2006 QX74  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-19 07:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin