+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   243453 (2009 HX85) Classification: Jupiter Trojan          SPK-ID: 2243453 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1179806696157374 6.099e-08   a 5.139599914717411 2.0587e-07 au q 4.533226475222063 4.5267e-07 au i 18.49221512557874 6.3189e-06 deg node 193.7722242871911 1.6867e-05 deg peri 93.97197587363644 4.2962e-05 deg M 296.2431744663945 4.8746e-05 deg tp 2459954.231353436329 (2023-Jan-09.73135344) 0.00061342 TDB period 4255.909621693077 11.65 0.00025571 7.001e-07 d yr n .08458826243983669 5.0823e-09 deg/d Q 5.745973354212757 2.3016e-07 au   Orbit Determination Parameters    # obs. used (total)      283      data-arc span      6841 days (18.73 yr)      first obs. used      2001-08-27      last obs. used      2020-05-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53445      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 00:56:28   Additional Information  Earth MOID = 3.58167 au   Jupiter MOID = .10786 au   T_jup = 2.884  [ hide covariance matrix ] Orbital Elements at Epoch 2457336.5 (2015-Nov-10.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1155950005214814 6.1331e-08   q 4.55931889302614 4.5766e-07 au tp 2455682.219640059935 (2011-Apr-30.71964006) 0.00043439 TDB node 193.7874991721659 1.6864e-05 deg peri 93.50306009283889 4.3567e-05 deg i 18.47707454444816 6.3142e-06 deg   Orbit Determination Parameters    # obs. used (total)      283      data-arc span      6841 days (18.73 yr)      first obs. used      2001-08-27      last obs. used      2020-05-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53445      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 00:56:28   Additional Information  Jupiter MOID = .10786 au   T_jup = 2.884  Orbit Covariance (6×6)   e q tp node peri i e 3.761546995414689E-15 -2.673509752578682E-14 -1.132993867612416E-11 -5.846700174472395E-15 -1.242185537521359E-12 -2.674217655359431E-15 q -2.673509752578682E-14 2.094495701934523E-13 1.059057158088672E-10 4.431126445132783E-14 1.168171712295804E-11 2.993232669675812E-14 tp -1.132993867612416E-11 1.059057158088672E-10 1.886937526809917E-7 3.049893830667032E-11 1.730514687553963E-8 1.472234204782547E-11 node -5.846700174472395E-15 4.431126445132783E-14 3.049893830667032E-11 2.843800338842457E-10 -2.663848783355719E-10 1.356639255082134E-11 peri -1.242185537521359E-12 1.168171712295804E-11 1.730514687553963E-8 -2.663848783355719E-10 1.898041346148759E-9 -1.09870615583087E-11 i -2.674217655359431E-15 2.993232669675812E-14 1.472234204782547E-11 1.356639255082134E-11 -1.09870615583087E-11 3.986928973835243E-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 13.22   n/a E2021B55   diameter diameter 15.137 km 0.526 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)   geometric albedo albedo 0.037   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)   243453 (2009 HX85)          Discovered 2009-Apr-29 by Spacewatch at Kitt Peak Reference: 20100626/Numbers.arc Last Updated: 2010-06-28 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-04 23:35 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin