+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   305507 (2008 EK117) Classification: Main-belt Asteroid          SPK-ID: 2305507 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1072772658441813 5.4106e-08   a 3.071390544171105 3.4035e-08 au q 2.741900164252757 1.6023e-07 au i 11.77838747541488 8.0508e-06 deg node 14.99054482910544 3.1772e-05 deg peri 134.1009093629477 5.7505e-05 deg M 131.1071097654285 4.458e-05 deg tp 2458284.480691295679 (2018-Jun-14.98069130) 0.00024441 TDB period 1966.079121069345 5.38 3.268e-05 8.947e-08 d yr n .1831055506068327 3.0436e-09 deg/d Q 3.400880924089452 3.7687e-08 au   Orbit Determination Parameters    # obs. used (total)      156      data-arc span      6823 days (18.68 yr)      first obs. used      2000-09-24      last obs. used      2019-05-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65114      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 17:55:23   Additional Information  Earth MOID = 1.76618 au   Jupiter MOID = 1.61659 au   T_jup = 3.190  [ hide covariance matrix ] Orbital Elements at Epoch 2457302.5 (2015-Oct-07.0) TDB Reference: JPL 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1069225453582097 5.3384e-08   q 2.739322115971893 1.5713e-07 au tp 2458277.213949358822 (2018-Jun-07.71394936) 0.00024683 TDB node 15.18979350830862 3.1705e-05 deg peri 132.4026812112719 5.7989e-05 deg i 11.79356711329859 8.0638e-06 deg   Orbit Determination Parameters    # obs. used (total)      156      data-arc span      6823 days (18.68 yr)      first obs. used      2000-09-24      last obs. used      2019-05-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65114      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 17:55:23   Additional Information  Jupiter MOID = 1.61659 au   T_jup = 3.190  Orbit Covariance (6×6)   e q tp node peri i e 2.849893511381278E-15 -8.252526577752031E-15 2.276343183663792E-12 -1.33580431858449E-14 4.024162934579157E-13 -9.998682283794128E-15 q -8.252526577752031E-15 2.468982649129449E-14 -7.16963793518874E-12 2.392781207500034E-14 -1.352957395625742E-12 2.869859265229112E-14 tp 2.276343183663792E-12 -7.16963793518874E-12 6.092665155857799E-8 1.380566733011013E-10 1.201492425979827E-8 1.102886320174717E-11 node -1.33580431858449E-14 2.392781207500034E-14 1.380566733011013E-10 1.005222701506754E-9 -9.549245539495557E-10 8.821909285416795E-11 peri 4.024162934579157E-13 -1.352957395625742E-12 1.201492425979827E-8 -9.549245539495557E-10 3.362683867704477E-9 -8.398480650103035E-11 i -9.998682283794128E-15 2.869859265229112E-14 1.102886320174717E-11 8.821909285416795E-11 -8.398480650103035E-11 6.50246275487877E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.3   n/a MPO476361   305507 (2008 EK117)          Discovered 2008-Mar-08 by Spacewatch at Kitt Peak Reference: 20111110/Numbers.arc Last Updated: 2011-11-14 [ show close-approach data ] Alternate Designations  2008 EK117 = 2005 SE197  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-18 12:11 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin