\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 \begindata Delivery_File_Description = ( 'HUYGENS +' ' DTWG_DELIVERY_3') \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. Probe_State=(-6.824626095E+01, -3.809336798E+03, -3.118217596E+02, -2.379411383E+00, 5.534426806E+00, 2.273084312E-01) Assumptions: High altitude wind model as proposed by M. Bird Starting from JPL050214 initial state vector 1. Fitting iteration * STATE VECTOR CORRECTIONS IN [KM] AND [KM/S]: * SATE(1)= -8.908960252E-01 * SATE(2)= 2.033873694E+01 * SATE(3)= -3.155297203E+01 * SATE(4)= 1.617553066E-04 * SATE(5)= 1.783525618E-04 * SATE(6)= 1.956526104E-03 * CORRECTED ALTITUDE [KM] = 37.5506053219434 * CORRECTED ABS. VELOCITY [KM/S]= 1.971286080109489E-003 * CHISQ= 51.1534249746895 * SATE(1)= -7.573945943E+01 * SATE(2)= -3.811749595E+03 * SATE(3)= -3.375033151E+02 * SATE(4)= -2.379829387E+00 * SATE(5)= 5.537324937E+00 * SATE(6)= 2.288709921E-01 2. Fitting Iteration * STATE VECTOR CORRECTIONS IN [KM] AND [KM/S]: * SATE(1)= -2.628752090E+00 * SATE(2)= 1.843145190E+00 * SATE(3)= -8.863087615E+00 * SATE(4)= 5.632058838E-04 * SATE(5)= -1.483708844E-03 * SATE(6)= 4.754683211E-04 * CORRECTED ALTITUDE [KM] = 9.42665602476998 * CORRECTED ABS. VELOCITY [KM/S]= 1.656702425579306E-003 * CORRECTED STATE VECTOR IN [KM] AND [KM/S]: * SATE(1)= -7.836821152E+01 * SATE(2)= -3.809906450E+03 * SATE(3)= -3.463664027E+02 * SATE(4)= -2.379266181E+00 * SATE(5)= 5.535841228E+00 * SATE(6)= 2.293464604E-01 3 Fitting Iteration * STATE VECTOR CORRECTIONS IN [KM] AND [KM/S]: * SATE(1)= -2.451966428E+00 * SATE(2)= 1.988039589E+00 * SATE(3)= -8.676217922E+00 * SATE(4)= 5.509559547E-04 * SATE(5)= -1.470027094E-03 * SATE(6)= 4.659814290E-04 * CORRECTED ALTITUDE [KM] = 9.23261600022066 * CORRECTED ABS. VELOCITY [KM/S]= 1.637580780485376E-003 * SATE(1)= -8.082017795E+01 * SATE(2)= -3.807918410E+03 * SATE(3)= -3.550426206E+02 * SATE(4)= -2.378715225E+00 * SATE(5)= 5.534371201E+00 * SATE(6)= 2.298124418E-01 Probe_State = (-8.082017795E+01, -3.807918410E+03, -3.550426206E+02, -2.378715225E+00, 5.534371201E+00, 2.298124418E-01) \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 of BODY699_GM changed; OD 050214 from NAVT ***** ********************************************************** BODY699_GM = (37931137.6508) < -- CPCK052005_NAV.tpc) Estimate_Saturn_GM = ( 3.794051588E+07 ) FROM JPL DELIVERY \begindata Estimate_Saturn_GM = (37931137.6508) \begintext Titan gravitational constant (GM) in km3/s2. Estimate_Titan_GM = ( 8.978169093E+03 ) ********************************************************** ***** Value of BODY606_GM changed; OD 050214 from NAVT ***** ********************************************************** Estimate_Titan_GM=( 8978.169116863904 ) ********************************************************** TITAN FROM CPCK052005_NAV.tpc ********************************************************** BODY606_GM = ( 8978.142297854909 ) \begindata Estimate_Titan_GM=( 8978.142297854909 ) \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 NOTE THOSE VALUES ARE ALREADY PROVIDED IN 050214_PCK.TXT Titan related physical constants, i.e., - Pole right ascension [deg] - Pole declination [deg] - Pole prime meridian numbers as defined in [RD.1] Davies et. al, 1996, "Report - Longitude Axis - Titan radius [km] BODY606_POLE_RA = ( 36.41 -0.036 0. ) BODY606_POLE_DEC = ( +83.94 -0.004 0. ) BODY606_PM = ( 189.64 +22.5769768 0. ) BODY606_LONG_AXIS = ( 0. ) - Titan J2 harmonic coefficient \begindata BODY606_J2 = ( 0.0D0 ) \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)