\begintext ******************************************************* * HUYGENS PROBE INITIAL CONDITIONS AND EVENT FILE * ******************************************************* According to: "HUYGENS - DTWG Experimenter to DTWG Interface Control Document " Issue 9, Rev. 1, Jan 2005 Section 5 This file was generated for DTWG#5 and adapted from the EVENT_FILE04042005.DAT used for DTWG#4. \begindata Delivery_File_Description = ( 'HUYGENS +' ' DTWG_DELIVERY_5') \begintext Predicted Interface Time (ET). \begindata Interface_Time = ( @14-JAN-2005-09:06:56.707) \begintext Probe position (km) and velocity (km/s) vectors in Titan-centered, EME2000 coordinates at the predicted interface time. Initial Conditions taken from 050214 delivery ! Probe_State = ( -7.484856340E+01, -3.832088332E+03, -3.059503431E+02, -2.379991142E+00, 5.537146584E+00, 2.269144660E-01 ) %%%%%%%%%%%%%%%%%% ADJUSTED STATE VECTOR %%%%%%%%%%%%%%%%% Assumptions: 90 m/s prograde high altitude wind. \begindata Probe_State=(-6.824626095E+01, -3.809336798E+03, -3.118217596E+02, -2.379411383E+00, 5.534426806E+00, 2.273084312E-01) \begintext Saturnian system gravitational constant (GM) in km3/s2. Value taken from cpk14Jan2010.tcp = Cassini NAV OD solution 100103_123T64. \begindata Estimate_Saturn_GM = (37931207.6569) \begintext Titan gravitational constant (GM) in km3/s2. Value taken from cpk14Jan2010.tcp from Cassini NAV OD solution 061122_034Sa \begindata Estimate_Titan_GM=(8978.139773741363 ) \begintext Full 14 x 14 knowledge covariance matrix mapped at the predicted interface time. Ordered as probe state (Xp,Yp,Zp,DXp,DYp,DZp), orbiter state (Xo,Yo, Zo,DXo,DYo,DZo), Saturnian system GM, the Titan GM. \begindata Cov_Matrix = ( 3.156923234481444E+01, 1.559301520028660E+02, -9.014850425328538E+00, -4.525992662076362E-03, 1.553348992913819E-02, 2.040426063253515E-03, -3.503846457675890E-01, -1.820302219216444E-01, -3.966201158598939E-01, 1.087816317981495E-06, -6.074361800482792E-07, 4.268116507505805E-06, 1.149040030106182E+00, -3.870037971634083E-03, 1.559301520028660E+02, 1.030379523490218E+03, -4.954206497851778E+01, -2.714281502538983E-02, 1.037157802018300E-01, 1.298810028540608E-02, -3.336187915758773E+00, -4.817135589429529E-01, -3.002272201142371E+00, 1.406030008805069E-05, -5.118860786161467E-06, 3.195408119619359E-05, 1.827071328273381E+01, 4.250740613987790E-02, -9.014850425328538E+00, -4.954206497851778E+01, 1.320631521082116E+01, 1.370300438960769E-03, -4.850005504965747E-03, -1.241102795130631E-03, 1.373015036734830E+00, 2.154174018005261E-01, 1.231425396286100E+00, -5.641026519841186E-06, 2.492065792259961E-06, -1.254369160264374E-05, -4.177162196352054E+00, -8.673502699236097E-03, -4.525992662076362E-03, -2.714281502538983E-02, 1.370300438960769E-03, 7.369932793454834E-07, -2.723774594039507E-06, -3.452302124642610E-07, 7.744809779369771E-05, 1.860373530049438E-05, 7.419475797019350E-05, -3.029729581437819E-10, 1.228646361498351E-10, -7.800808669030401E-10, -3.929522932630352E-04, -5.452428025107822E-07, 1.553348992913819E-02, 1.037157802018300E-01, -4.850005504965747E-03, -2.723774594039507E-06, 1.044417597983205E-05, 1.299776662337874E-06, -3.265316020276209E-04, -4.449566758080607E-05, -2.923325814656018E-04, 1.384821297758668E-09, -4.895507602923654E-10, 3.119009591957953E-09, 1.851211547419880E-03, 4.451190700773855E-06, 2.040426063253515E-03, 1.298810028540608E-02, -1.241102795130631E-03, -3.452302124642610E-07, 1.299776662337874E-06, 1.989943186654531E-07, -1.133751451621837E-04, -1.663919544026441E-05, -1.014242527523662E-04, 4.832760520248179E-10, -1.911647330337565E-10, 1.165285228984361E-09, 4.084071466401940E-04, 9.411664737136252E-07, -3.503846457675890E-01, -3.336187915758773E+00, 1.373015036734830E+00, 7.744809779369771E-05, -3.265316020276209E-04, -1.133751451621837E-04, 7.245766424501913E-01, -8.668905454569851E-04, 5.875519999488716E-01, -3.032333711701078E-06, 1.024175542185000E-06, -5.539878694700259E-06, -1.618983686322106E+00, -1.049808031778123E-02, -1.820302219216444E-01, -4.817135589429529E-01, 2.154174018005261E-01, 1.860373530049438E-05, -4.449566758080607E-05, -1.663919544026441E-05, -8.668905454569851E-04, 1.904617676769355E-01, 7.899790449800249E-02, 6.491787712980828E-07, 3.132447581746109E-07, -3.113132551749756E-07, -4.730226587092459E-01, 1.034320159033703E-02, -3.966201158598939E-01, -3.002272201142371E+00, 1.231425396286100E+00, 7.419475797019350E-05, -2.923325814656018E-04, -1.014242527523662E-04, 5.875519999488716E-01, 7.899790449800249E-02, 5.201905569046331E-01, -2.205136544946909E-06, 1.004398897922406E-06, -4.726400270568135E-06, -1.315561874073356E+00, -3.667163212070682E-03, 1.087816317981495E-06, 1.406030008805069E-05, -5.641026519841186E-06, -3.029729581437819E-10, 1.384821297758668E-09, 4.832760520248179E-10, -3.032333711701078E-06, 6.491787712980828E-07, -2.205136544946909E-06, 1.918633076012896E-11, -2.618132029170226E-12, 3.475950677276766E-11, 3.691421594885408E-06, 7.722600723030216E-08, -6.074361800482792E-07, -5.118860786161467E-06, 2.492065792259961E-06, 1.228646361498351E-10, -4.895507602923654E-10, -1.911647330337565E-10, 1.024175542185000E-06, 3.132447581746109E-07, 1.004398897922406E-06, -2.618132029170226E-12, 9.082996641707642E-12, -5.099053272493310E-12, 1.017586860286359E-05, 9.313726329218309E-09, 4.268116507505805E-06, 3.195408119619359E-05, -1.254369160264374E-05, -7.800808669030401E-10, 3.119009591957953E-09, 1.165285228984361E-09, -5.539878694700259E-06, -3.113132551749756E-07, -4.726400270568135E-06, 3.475950677276766E-11, -5.099053272493310E-12, 1.624636348479146E-10, -2.027191663121967E-06, 3.054927887417266E-08, 1.149040030106182E+00, 1.827071328273381E+01, -4.177162196352054E+00, -3.929522932630352E-04, 1.851211547419880E-03, 4.084071466401940E-04, -1.618983686322106E+00, -4.730226587092459E-01, -1.315561874073356E+00, 3.691421594885408E-06, 1.017586860286359E-05, -2.027191663121967E-06, 1.842531050484602E+02, 7.056343510904860E-02, -3.870037971634083E-03, 4.250740613987790E-02, -8.673502699236097E-03, -5.452428025107822E-07, 4.451190700773855E-06, 9.411664737136252E-07, -1.049808031778123E-02, 1.034320159033703E-02, -3.667163212070682E-03, 7.722600723030216E-08, 9.313726329218309E-09, 3.054927887417266E-08, 7.056343510904860E-02, 1.632102786298776E-03 ) \begintext Body J2 coefficient taken from cpk14Jan2010.tcp based on Cassini NAV OD solution 081208_094T48. \begindata BODY606_J2 = ( 0.00003345D0 ) \begintext The following important events [all in ET seconds past J2000] are required for the quality control and consistency check of the reconstructed trajectory: - Interface time - G-switch epochs - S0 detection - T0 detection - Main parachute deploy - Heat shield (FRSS) release - Link established - DISR cover ejection - HASI boom deployment - GCMS cover ejection - ACP cover ejection - Stabilyzer chute deploy - Touchdown time - Link lost Carrier lock, subcarrier lock, bit synchronization and viterbi decoder lock was achieved at 2005 01 14 09 11 07.173 UTC, or 158965931.357 ET \begindata INTERFACE_EVENT= (158965616.7070) GSW_EVENT= (158965872.184) S0_EVENT= (158965879.184) T0_EVENT= (158965885.184) MAIN_CH_EVENT= (158965888.384) FRSS_EVENT= (158965916.184) LINK_EVENT= (158965931.357) DISR_COV_EVENT= (158965952.184) HASI_BOOM_EVENT= (158965950.184) GCMS_INLET_COV_EVENT= (0) GCMS_OUTLET_COV_EVENT= (0) ACP_COV_EVENT= (158966035.184) DROGUE_CH_EVENT= (158966785.184) TOUCHDOWN= (158974754.9543) LINK_LOST= (158979088.184)