PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT NOTE = "ATTEPGIO.DOC file is supplied by T Morley as part of the experimenter team package for GEM" PUBLICATION_DATE = 1993-12-01 END_OBJECT END ***** File ATTEPGIO.DOC Giotto Attitude History File ---------------------------- 1. File Details The experimenter attitude history file contains records according to the content and format described in the Giotto Software Design Document, Annex C. Originally, it was intended that records would be provided only between two consecutive manoeuvres. However, it was decided to include additional records corresponding to fine attitude determination using the Giotto star mapper operating in star mode. Thus, in any period between two manoeuvres there could in general be more than one record containing the attitude details during free drift. The resulting file provides a more finely sampled representation of the attitude history of Giotto. The record format (same as for the Halley encounter) is described in Table 1. Notes: 1) The start and stop times are UTC ground receive time. 2) The attitude is provided with respect to the spacecraft -z axis (+ve spin-axis) in the mean equatorial system of B1950. 3) In any single given record the attitude refers to the attitude at the start time specified in that record. Similarly, the spin-rate provided also corresponds to the record start time. 4) It may be assumed that if the delta-V is exactly zero, and if indicator flags F2 and F3 are both set to zero, then the attitude etc. provided for that record corresponds to a period of free drift, i.e. no manoeuvres have occurred. 5) Default values of indicator flags F1, F2, F3 are zero. 6) During 1 - 12 July 1992, Giotto's geocentric distance decreased from 1.4396 AU to 1.4264 AU. The one-way light time correspondingly decreased from 11 min 58.4 s to 11 min 51.8 s. The event time on-board can be calculated by subtracting the one-way light time from the ground receive time. The spacecraft's geocentric distance, and hence light time will be easy to compute from the orbital data. Table 1 Format of the attitude records !---------!-------------!----------------------------------------------------! ! BYTE ! FORMAT ! DESCRIPTION ! !---------!-------------!----------------------------------------------------! ! ! ! ! ! 1 - 3 ! I2,1X ! YEAR START ! ! 4 - 7 ! I3,1X ! DAY IN YEAR TIME ! ! 8 - 10 ! I2,1X ! HOUR OF ! ! 11 - 13 ! I2,1X ! MIN VALIDITY. ! ! 14 - 16 ! I2,1X ! SEC ! ! 17 - 20 ! 4X ! BLANK SPACE PADDING ! ! 21 - 23 ! I2,1X ! YEAR STOP ! ! 24 - 27 ! I3,1X ! DAY IN YEAR TIME ! ! 28 - 30 ! I2,1X ! HOUR OF ! ! 31 - 33 ! I2,1X ! MIN VALIDITY. ! ! 34 - 36 ! I2,1X ! SEC ! ! 37 - 40 ! 4X ! BLANK SPACE PADDING ! ! 41 - 48 ! F6.2,2X ! ATTITUDE RIGHT ASCENSION (DEG) ! ! 49 - 56 ! F6.2,2X ! ATTITUDE DECLINATION (DEG) ! ! 57 - 63 ! F6.3,1X ! INSTANTANEOUS SPIN RATE (RPM) ! ! 64 - 66 ! 3X ! BLANK SPACE PADDING ! ! 67 - 74 ! F7.4,1X ! VELOCITY INCREMENT/ DELTA-V (DV) (M/S) ! ! 75 - 76 ! 2X ! BLANK SPACE PADDING ! ! 77 ! I1 ! INDICATOR FLAG F1 : F1=1 IF ATT.IS A PREDICTION ! ! 78 ! I1 ! INDICATOR FLAG F2 : F2=1 IF DV IS INACCURATE ! ! 79 ! I1 ! INDICATOR FLAG F3 : F3=1 IF DV NOT PROVIDED ! ! 80 ! 1X ! BLANK SPACE PADDING. ! ! ! ! ! !---------!-------------!----------------------------------------------------! N.B. The delta-V applies to a manoeuvre starting at the stop time of validity and ending at the start time of the next record. 2. File listing 92 182 06 00 00 92 183 06 00 00 101.40 22.87 14.918 0.0000 000 92 183 06 00 00 92 184 07 25 00 101.39 22.81 14.920 0.0000 000 92 184 07 25 00 92 184 16 35 00 101.37 22.73 14.920 0.0000 000 92 184 16 35 00 92 184 16 56 27 101.37 22.70 14.920 0.0380 000 92 184 16 59 20 92 185 09 50 00 103.27 22.71 14.922 0.0000 000 92 185 09 50 00 92 186 22 05 00 103.25 22.69 14.921 0.0000 000 92 186 22 05 00 92 186 22 26 40 103.27 22.55 14.922 0.0459 000 92 186 22 30 05 92 187 09 20 00 105.55 22.40 14.924 0.0000 000 92 187 09 20 00 92 188 16 35 00 105.55 22.37 14.924 0.0000 000 92 188 16 35 00 92 188 16 56 30 105.52 22.28 14.925 0.0364 000 92 188 16 59 15 92 189 13 00 00 107.36 22.20 14.927 0.0000 000 92 189 13 00 00 92 189 19 40 00 107.42 22.16 14.931 0.0000 000 92 189 19 40 00 92 190 16 05 00 107.38 22.13 14.931 0.0000 000 92 190 16 05 00 92 190 16 27 26 107.39 22.07 14.931 1.9793 000 92 190 17 19 14 92 190 19 12 37 106.81 21.78 15.029 0.0680 000 92 190 19 17 36 92 191 10 55 00 110.22 22.15 15.031 0.0000 000 92 191 10 55 00 92 192 17 10 00 110.22 22.11 15.030 0.0000 000 92 192 17 10 00 92 193 17 45 00 110.29 22.05 15.034 0.0000 000 92 193 17 45 00 92 193 18 09 14 110.28 21.96 15.035 0.0448 000 92 193 18 12 37 92 194 10 35 00 112.39 21.58 15.035 0.0000 000 92 194 10 35 00 92 195 10 00 00 112.35 21.58 15.032 0.0000 000 92 195 10 00 00 92 195 13 50 00 112.33 21.51 15.033 0.0000 000 92 195 13 50 00 92 195 14 12 16 112.32 21.50 15.033 0.0441 000 92 195 14 15 36 92 196 10 20 00 114.48 21.35 15.035 0.0000 000 92 196 10 20 00 92 197 08 50 00 114.47 21.29 15.035 0.0000 000 92 197 08 50 00 92 197 12 10 53 114.37 21.17 15.034 0.1398 000 92 197 12 20 59 92 199 08 45 00 118.10 26.59 15.042 0.0000 000 92 199 08 45 00 92 199 11 42 11 117.99 26.45 15.042 0.0492 000 92 199 11 45 54 92 200 09 50 00 120.52 25.95 15.045 0.0000 000 92 200 09 50 00 92 201 11 00 00 120.56 25.90 15.045 0.0000 000 92 201 11 00 00 92 201 12 13 34 120.61 25.82 15.045 0.2079 000 92 201 12 28 31 92 202 15 00 00 119.79 16.52 15.056 0.0000 000 92 202 15 00 00 92 203 10 20 00 119.78 16.41 15.057 0.0000 000 92 203 10 20 00 92 203 10 42 16 119.78 16.39 15.057 0.0115 000 92 203 10 42 16 92 203 12 11 55 120.25 16.21 15.058 33.3246 000 92 203 16 12 23 92 204 11 00 00 120.16 16.34 14.992 0.0000 000 92 204 11 00 00 92 204 11 24 11 120.17 16.30 14.992 0.0401 000 92 204 11 27 27 92 205 11 50 00 121.99 15.95 14.995 0.0000 000 92 205 11 50 00 92 205 12 12 10 121.98 15.89 14.995 3.1508 000 92 205 12 37 50 92 205 14 13 08 121.97 15.87 14.912 1.6322 000 ***** File ATTEPGIO.DOC Giotto Attitude History File ---------------------------- 1. File Details The experimenter attitude history file contains records according to the content and format described in the Giotto Software Design Document, Annex C. Originally, it was intended that records would be provided only between two consecutive manoeuvres. However, it was decided to include additional records corresponding to fine attitude determination using the Giotto star mapper operating in star mode. Thus, in any period between two manoeuvres there could in general be more than one record containing the attitude details during free drift. The resulting file provides a more finely sampled representation of the attitude history of Giotto. The record format (same as for the Halley encounter) is described in Table 1. Notes: 1) The start and stop times are UTC ground receive time. 2) The attitude is provided with respect to the spacecraft -z axis (+ve spin-axis) in the mean equatorial system of B1950. 3) In any single given record the attitude refers to the attitude at the start time specified in that record. Similarly, the spin-rate provided also corresponds to the record start time. 4) It may be assumed that if the delta-V is exactly zero, and if indicator flags F2 and F3 are both set to zero, then the attitude etc. provided for that record corresponds to a period of free drift, i.e. no manoeuvres have occurred. 5) Default values of indicator flags F1, F2, F3 are zero. 6) During 1 - 12 July 1992, Giotto's geocentric distance decreased from 1.4396 AU to 1.4264 AU. The one-way light time correspondingly decreased from 11 min 58.4 s to 11 min 51.8 s. The event time on-board can be calculated by subtracting the one-way light time from the ground receive time. The spacecraft's geocentric distance, and hence light time will be easy to compute from the orbital data. Table 1 Format of the attitude records !---------!-------------!----------------------------------------------------! ! BYTE ! FORMAT ! DESCRIPTION ! !---------!-------------!----------------------------------------------------! ! ! ! ! ! 1 - 3 ! I2,1X ! YEAR START ! ! 4 - 7 ! I3,1X ! DAY IN YEAR TIME ! ! 8 - 10 ! I2,1X ! HOUR OF ! ! 11 - 13 ! I2,1X ! MIN VALIDITY. ! ! 14 - 16 ! I2,1X ! SEC ! ! 17 - 20 ! 4X ! BLANK SPACE PADDING ! ! 21 - 23 ! I2,1X ! YEAR STOP ! ! 24 - 27 ! I3,1X ! DAY IN YEAR TIME ! ! 28 - 30 ! I2,1X ! HOUR OF ! ! 31 - 33 ! I2,1X ! MIN VALIDITY. ! ! 34 - 36 ! I2,1X ! SEC ! ! 37 - 40 ! 4X ! BLANK SPACE PADDING ! ! 41 - 48 ! F6.2,2X ! ATTITUDE RIGHT ASCENSION (DEG) ! ! 49 - 56 ! F6.2,2X ! ATTITUDE DECLINATION (DEG) ! ! 57 - 63 ! F6.3,1X ! INSTANTANEOUS SPIN RATE (RPM) ! ! 64 - 66 ! 3X ! BLANK SPACE PADDING ! ! 67 - 74 ! F7.4,1X ! VELOCITY INCREMENT/ DELTA-V (DV) (M/S) ! ! 75 - 76 ! 2X ! BLANK SPACE PADDING ! ! 77 ! I1 ! INDICATOR FLAG F1 : F1=1 IF ATT.IS A PREDICTION ! ! 78 ! I1 ! INDICATOR FLAG F2 : F2=1 IF DV IS INACCURATE ! ! 79 ! I1 ! INDICATOR FLAG F3 : F3=1 IF DV NOT PROVIDED ! ! 80 ! 1X ! BLANK SPACE PADDING. ! ! ! ! ! !---------!-------------!----------------------------------------------------! N.B. The delta-V applies to a manoeuvre starting at the stop time of validity and ending at the start time of the next record. 2. File listing 92 182 06 00 00 92 183 06 00 00 101.40 22.87 14.918 0.0000 000 92 183 06 00 00 92 184 07 25 00 101.39 22.81 14.920 0.0000 000 92 184 07 25 00 92 184 16 35 00 101.37 22.73 14.920 0.0000 000 92 184 16 35 00 92 184 16 56 27 101.37 22.70 14.920 0.0380 000 92 184 16 59 20 92 185 09 50 00 103.27 22.71 14.922 0.0000 000 92 185 09 50 00 92 186 22 05 00 103.25 22.69 14.921 0.0000 000 92 186 22 05 00 92 186 22 26 40 103.27 22.55 14.922 0.0459 000 92 186 22 30 05 92 187 09 20 00 105.55 22.40 14.924 0.0000 000 92 187 09 20 00 92 188 16 35 00 105.55 22.37 14.924 0.0000 000 92 188 16 35 00 92 188 16 56 30 105.52 22.28 14.925 0.0364 000 92 188 16 59 15 92 189 13 00 00 107.36 22.20 14.927 0.0000 000 92 189 13 00 00 92 189 19 40 00 107.42 22.16 14.931 0.0000 000 92 189 19 40 00 92 190 16 05 00 107.38 22.13 14.931 0.0000 000 92 190 16 05 00 92 190 16 27 26 107.39 22.07 14.931 1.9793 000 92 190 17 19 14 92 190 19 12 37 106.81 21.78 15.029 0.0680 000 92 190 19 17 36 92 191 10 55 00 110.22 22.15 15.031 0.0000 000 92 191 10 55 00 92 192 17 10 00 110.22 22.11 15.030 0.0000 000 92 192 17 10 00 92 193 17 45 00 110.29 22.05 15.034 0.0000 000 92 193 17 45 00 92 193 18 09 14 110.28 21.96 15.035 0.0448 000 92 193 18 12 37 92 194 10 35 00 112.39 21.58 15.035 0.0000 000 92 194 10 35 00 92 195 10 00 00 112.35 21.58 15.032 0.0000 000 92 195 10 00 00 92 195 13 50 00 112.33 21.51 15.033 0.0000 000 92 195 13 50 00 92 195 14 12 16 112.32 21.50 15.033 0.0441 000 92 195 14 15 36 92 196 10 20 00 114.48 21.35 15.035 0.0000 000 92 196 10 20 00 92 197 08 50 00 114.47 21.29 15.035 0.0000 000 92 197 08 50 00 92 197 12 10 53 114.37 21.17 15.034 0.1398 000 92 197 12 20 59 92 199 08 45 00 118.10 26.59 15.042 0.0000 000 92 199 08 45 00 92 199 11 42 11 117.99 26.45 15.042 0.0492 000 92 199 11 45 54 92 200 09 50 00 120.52 25.95 15.045 0.0000 000 92 200 09 50 00 92 201 11 00 00 120.56 25.90 15.045 0.0000 000 92 201 11 00 00 92 201 12 13 34 120.61 25.82 15.045 0.2079 000 92 201 12 28 31 92 202 15 00 00 119.79 16.52 15.056 0.0000 000 92 202 15 00 00 92 203 10 20 00 119.78 16.41 15.057 0.0000 000 92 203 10 20 00 92 203 10 42 16 119.78 16.39 15.057 0.0115 000 92 203 10 42 16 92 203 12 11 55 120.25 16.21 15.058 33.3246 000 92 203 16 12 23 92 204 11 00 00 120.16 16.34 14.992 0.0000 000 92 204 11 00 00 92 204 11 24 11 120.17 16.30 14.992 0.0401 000 92 204 11 27 27 92 205 11 50 00 121.99 15.95 14.995 0.0000 000 92 205 11 50 00 92 205 12 12 10 121.98 15.89 14.995 3.1508 000 92 205 12 37 50 92 205 14 13 08 121.97 15.87 14.912 1.6322 000