EPOXI/EPOCh - Geometry for 27-28 March 2009 Earth North Polar Observation The EPOCh team provided the following observational geometry values covering the 27-28 March 2009 Earth North Polar Observation for convenience. Pointing telemetry in the form of reconstructed (actual) SPICE C-kernels was available for this period, and thus the data pipline was able to compute the corresponding parameters which are available in the archived data products. The EPOCh team used the HORIZONS system maintained by the JPL Solar System group to generate a raw look-up table of observational geometry parameters (see the second table below). To aid analysis, the EPOCh team constructed reduced values in the first table below by interpolating the raw look-up table from HORIZONS. Table 1 - Reduced observational geometry parameters constructed by interpolating values in the raw look-up table (Table 2). Date & Time Julian CML Lat Range Helio S-O-SC Illum% ----------------------- -------------- ----- ----- ------- ------- ------ ------- 2009-03-27T16:19:42.327 2454918.180351 152.1 62.0 0.11414 0.99803 86.938 53.558 2009-03-27T16:34:43.404 2454918.190780 155.9 62.0 0.11414 0.99803 86.939 53.557 2009-03-27T16:49:36.989 2454918.201123 159.6 62.0 0.11415 0.99803 86.940 53.557 2009-03-27T17:04:43.433 2454918.211614 163.4 62.0 0.11415 0.99803 86.940 53.557 2009-03-27T17:19:41.109 2454918.222004 167.1 62.0 0.11415 0.99804 86.941 53.556 2009-03-27T17:34:43.377 2454918.232447 170.9 62.0 0.11415 0.99804 86.941 53.556 2009-03-27T17:49:36.888 2454918.242788 174.6 62.0 0.11415 0.99804 86.942 53.555 2009-03-27T18:04:43.406 2454918.253280 178.4 62.0 0.11415 0.99805 86.942 53.555 2009-03-27T18:19:41.027 2454918.263669 182.2 62.0 0.11415 0.99805 86.943 53.555 2009-03-27T18:34:43.331 2454918.274113 186.0 62.0 0.11415 0.99805 86.944 53.554 2009-03-27T18:49:36.849 2454918.284454 189.7 62.0 0.11415 0.99806 86.944 53.554 2009-03-27T19:04:43.360 2454918.294946 193.5 62.0 0.11415 0.99806 86.945 53.554 2009-03-27T19:19:40.993 2454918.305336 197.2 62.0 0.11415 0.99806 86.945 53.553 2009-03-27T19:34:43.296 2454918.315779 201.0 62.0 0.11415 0.99806 86.946 53.553 2009-03-27T19:49:36.814 2454918.326120 204.7 62.0 0.11415 0.99807 86.946 53.552 2009-03-27T20:04:43.181 2454918.336611 208.5 62.0 0.11415 0.99807 86.947 53.552 2009-03-27T20:19:40.946 2454918.347002 212.3 62.0 0.11415 0.99807 86.948 53.552 2009-03-27T20:34:43.214 2454918.357445 216.0 62.0 0.11415 0.99808 86.948 53.551 2009-03-27T20:49:36.772 2454918.367787 219.8 62.0 0.11416 0.99808 86.949 53.551 2009-03-27T21:04:43.154 2454918.378277 223.5 62.0 0.11416 0.99808 86.949 53.551 2009-03-27T21:19:40.900 2454918.388668 227.3 62.0 0.11416 0.99809 86.950 53.550 2009-03-27T21:34:43.184 2454918.399111 231.1 62.0 0.11416 0.99809 86.951 53.550 2009-03-27T21:49:36.722 2454918.409453 234.8 62.0 0.11416 0.99809 86.951 53.549 2009-03-27T22:04:43.112 2454918.419943 238.6 62.0 0.11416 0.99809 86.952 53.549 2009-03-27T22:19:40.861 2454918.430334 242.3 62.0 0.11416 0.99810 86.952 53.549 2009-03-27T22:34:43.141 2454918.440777 246.1 62.0 0.11416 0.99810 86.953 53.548 2009-03-27T22:49:36.687 2454918.451119 249.8 62.0 0.11416 0.99810 86.953 53.548 2009-03-27T23:04:43.073 2454918.461610 253.6 62.0 0.11416 0.99811 86.954 53.548 2009-03-27T23:19:40.835 2454918.472000 257.4 62.0 0.11416 0.99811 86.955 53.548 2009-03-27T23:34:43.009 2454918.482442 261.1 62.0 0.11416 0.99811 86.955 53.547 2009-03-27T23:49:36.641 2454918.492785 264.9 62.0 0.11416 0.99811 86.956 53.547 2009-03-28T00:04:43.038 2454918.503276 268.7 62.0 0.11416 0.99812 86.956 53.547 2009-03-28T00:19:40.800 2454918.513667 272.4 62.0 0.11416 0.99812 86.957 53.546 2009-03-28T00:34:42.970 2454918.524109 276.2 62.0 0.11416 0.99812 86.958 53.546 2009-03-28T00:49:36.614 2454918.534452 279.9 62.0 0.11416 0.99813 86.958 53.545 2009-03-28T01:04:43.000 2454918.544942 283.7 62.0 0.11416 0.99813 86.959 53.545 2009-03-28T01:19:40.668 2454918.555332 287.5 62.0 0.11417 0.99813 86.959 53.545 2009-03-28T01:34:42.936 2454918.565775 291.2 62.0 0.11417 0.99814 86.960 53.544 2009-03-28T01:49:36.454 2454918.576116 295.0 62.0 0.11417 0.99814 86.961 53.544 2009-03-28T02:04:42.965 2454918.586608 298.7 62.0 0.11417 0.99814 86.961 53.544 2009-03-28T02:19:40.633 2454918.596998 302.5 62.0 0.11417 0.99814 86.962 53.543 2009-03-28T02:34:42.909 2454918.607441 306.3 62.0 0.11417 0.99815 86.962 53.543 2009-03-28T02:49:36.416 2454918.617783 310.0 62.0 0.11417 0.99815 86.963 53.542 2009-03-28T03:04:42.938 2454918.628275 313.8 62.0 0.11417 0.99815 86.963 53.542 2009-03-28T03:19:40.551 2454918.638664 317.5 62.0 0.11417 0.99816 86.964 53.542 2009-03-28T03:34:42.862 2454918.649107 321.3 62.0 0.11417 0.99816 86.965 53.541 2009-03-28T03:49:36.389 2454918.659449 325.0 62.0 0.11417 0.99816 86.965 53.541 2009-03-28T04:04:42.798 2454918.669940 328.8 62.0 0.11417 0.99817 86.966 53.541 2009-03-28T04:19:40.525 2454918.680330 332.6 62.0 0.11417 0.99817 86.966 53.540 2009-03-28T04:34:42.828 2454918.690774 336.3 62.0 0.11417 0.99817 86.967 53.540 2009-03-28T04:49:36.319 2454918.701115 340.1 62.0 0.11417 0.99817 86.968 53.539 2009-03-28T05:04:42.713 2454918.711605 343.9 62.0 0.11417 0.99818 86.968 53.539 2009-03-28T05:19:40.467 2454918.721996 347.6 62.0 0.11417 0.99818 86.969 53.539 2009-03-28T05:34:42.742 2454918.732439 351.4 62.0 0.11417 0.99818 86.969 53.538 2009-03-28T05:49:36.280 2454918.742781 355.1 62.0 0.11417 0.99819 86.970 53.538 2009-03-28T06:04:42.678 2454918.753272 358.9 62.0 0.11417 0.99819 86.971 53.538 2009-03-28T06:19:40.440 2454918.763662 2.6 62.0 0.11418 0.99819 86.971 53.538 2009-03-28T06:34:42.708 2454918.774105 6.4 62.0 0.11418 0.99819 86.972 53.537 2009-03-28T06:49:36.246 2454918.784447 10.1 62.0 0.11418 0.99820 86.972 53.537 2009-03-28T07:04:42.643 2454918.794938 13.9 62.0 0.11418 0.99820 86.973 53.537 2009-03-28T07:19:40.393 2454918.805329 17.7 62.0 0.11418 0.99820 86.974 53.536 2009-03-28T07:34:42.575 2454918.815770 21.5 62.0 0.11418 0.99821 86.974 53.536 2009-03-28T07:49:36.219 2454918.826114 25.2 62.0 0.11418 0.99821 86.975 53.535 2009-03-28T08:04:42.605 2454918.836604 29.0 62.0 0.11418 0.99821 86.975 53.535 2009-03-28T08:19:40.359 2454918.846995 32.7 62.0 0.11418 0.99822 86.976 53.535 2009-03-28T08:34:42.541 2454918.857437 36.5 62.0 0.11418 0.99822 86.977 53.534 2009-03-28T08:49:36.106 2454918.867779 40.2 62.0 0.11418 0.99822 86.977 53.534 2009-03-28T09:04:42.570 2454918.878270 44.0 62.0 0.11418 0.99822 86.978 53.534 2009-03-28T09:19:40.234 2454918.888660 47.8 62.0 0.11418 0.99823 86.978 53.533 2009-03-28T09:34:42.502 2454918.899103 51.5 62.0 0.11418 0.99823 86.979 53.533 2009-03-28T09:49:36.024 2454918.909445 55.3 62.0 0.11418 0.99823 86.980 53.532 2009-03-28T10:04:42.532 2454918.919937 59.0 62.0 0.11418 0.99824 86.980 53.532 2009-03-28T10:19:40.207 2454918.930326 62.8 62.0 0.11418 0.99824 86.981 53.532 2009-03-28T10:34:42.467 2454918.940769 66.6 62.0 0.11418 0.99824 86.981 53.531 2009-03-28T10:49:35.990 2454918.951111 70.3 62.0 0.11418 0.99824 86.982 53.531 2009-03-28T11:04:42.497 2454918.961603 74.1 62.0 0.11418 0.99825 86.982 53.531 2009-03-28T11:19:40.169 2454918.971993 77.8 62.0 0.11418 0.99825 86.983 53.530 2009-03-28T11:34:42.440 2454918.982436 81.6 62.0 0.11418 0.99825 86.984 53.530 2009-03-28T11:49:35.947 2454918.992777 85.3 62.0 0.11418 0.99826 86.984 53.529 2009-03-28T12:04:42.365 2454919.003268 89.1 62.0 0.11418 0.99826 86.985 53.529 2009-03-28T12:19:40.079 2454919.013658 92.9 62.0 0.11418 0.99826 86.985 53.529 2009-03-28T12:34:42.394 2454919.024102 96.6 62.0 0.11419 0.99827 86.986 53.528 2009-03-28T12:49:35.885 2454919.034443 100.4 62.0 0.11419 0.99827 86.987 53.528 2009-03-28T13:04:42.330 2454919.044934 104.2 62.0 0.11419 0.99827 86.987 53.528 2009-03-28T13:19:40.037 2454919.055324 107.9 62.0 0.11419 0.99827 86.988 53.527 2009-03-28T13:34:42.359 2454919.065768 111.7 62.0 0.11419 0.99828 86.989 53.527 2009-03-28T13:49:35.851 2454919.076109 115.4 62.0 0.11419 0.99828 86.989 53.526 2009-03-28T14:04:42.244 2454919.086600 119.2 62.0 0.11419 0.99828 86.990 53.526 2009-03-28T14:19:40.006 2454919.096991 123.0 62.0 0.11419 0.99829 86.990 53.526 2009-03-28T14:34:42.274 2454919.107434 126.7 62.0 0.11419 0.99829 86.991 53.525 2009-03-28T14:49:35.812 2454919.117776 130.5 62.0 0.11419 0.99829 86.992 53.525 2009-03-28T15:04:42.210 2454919.128266 134.2 62.0 0.11419 0.99830 86.992 53.525 2009-03-28T15:19:39.964 2454919.138657 138.0 62.0 0.11419 0.99830 86.993 53.524 2009-03-28T15:34:42.146 2454919.149099 141.8 62.0 0.11419 0.99830 86.993 53.524 2009-03-28T15:49:35.785 2454919.159442 145.5 62.0 0.11419 0.99830 86.994 53.523 2009-03-28T16:04:42.175 2454919.169933 149.3 62.0 0.11419 0.99831 86.995 53.523 2009-03-28T16:19:39.925 2454919.180323 153.0 62.0 0.11419 0.99831 86.995 53.523 ----------------------- -------------- ----- ----- ------- ------- ------ ------- Date & Time = UTC date and time at spacecraft at moment of spacecraft measurement of event (i.e., light travel time of event detection is accounted for) Julian = Julian date and time CML = subspacecraft central meridian West longitude of Earth image at moment of image arrival at spacecraft Lat = subspacecraft latitude on Earth Range = range of spacecraft from Earth geocenter Helio = heliocentric range of Earth geocenter from Sun center at moment observed by spacecraft S-O-SC = Sun-object-spacecraft angle, in degrees Illum% = illumination percentage Table 2 - Raw Observational Geometry Look-Up Table from Horizons. JULIAN = dblarr(31) ; Julian date RA = JULIAN ; astrometric right ascension from spacecraft, in degrees DEC = JULIAN ; astrometric declination from spacecraft, in degrees ILLUM_FRAC = JULIAN ; illumination fraction (in percentage) EQ_DIAM = JULIAN ; apparent equatorial diameter, in arcsec SUBSCLON = JULIAN ; subspacecraft central meridian West longitude SUBSCLAT = JULIAN ; subspacecraft latitude SUBSUNLO = JULIAN ; subSun central meridian West longitude SUBSUNLA = JULIAN ; SubSun latitude NPPA = JULIAN ; North Pole Position Angle, ccw positive from Cel. N., in degrees RANGE_HELIO = JULIAN ; heliocentric range, in AU RANGE_TARGET = JULIAN ; geocentric range of spacecraft, in AU PHASE_ANGLE = JULIAN ; phase angle = Sun-object-spacecraft angle, in degrees SUB SUB SUB SUB JULIAN RA DEC ILL_FR EQ_DIAM SCLON SCLAT SUNLO SUNLA NPPA RANGE_HELIO RANGE_TARGET PH_ANG ------------------ --------- -------- ------ -------- ------ ----- ------ ----- -------- -------------- ---------------- ------- 2454918.000000000 99.84833 -61.54363 53.565 154.0369 275.12 +61.71 1.63 +2.78 359.8936 0.997974515292 0.11418237789687 85.9113 2454918.041666667 99.85272 -61.54249 53.564 154.0330 260.08 +61.71 346.63 +2.79 359.8936 0.997986373628 0.11418528512288 85.9129 2454918.083333333 99.85712 -61.54136 53.562 154.0291 245.05 +61.71 331.62 +2.81 359.8936 0.997998230407 0.11418813289447 85.9145 2454918.125000000 99.86151 -61.54022 53.561 154.0253 230.01 +61.71 316.62 +2.83 359.8936 0.998010085624 0.11419092121413 85.9161 2454918.166666667 99.86590 -61.53909 53.559 154.0217 214.97 +61.71 301.62 +2.84 359.8936 0.998021939277 0.11419365008446 85.9178 2454918.208333333 99.87029 -61.53795 53.558 154.0181 199.94 +61.71 286.61 +2.86 359.8936 0.998033791361 0.11419631950812 85.9194 2454918.250000000 99.87468 -61.53682 53.557 154.0145 184.90 +61.71 271.61 +2.88 359.8936 0.998045641873 0.11419892948787 85.9210 2454918.291666667 99.87907 -61.53568 53.555 154.0111 169.86 +61.71 256.61 +2.89 359.8936 0.998057490811 0.11420148002654 85.9226 2454918.333333333 99.88346 -61.53455 53.554 154.0077 154.83 +61.70 241.60 +2.91 359.8936 0.998069338172 0.11420397112703 85.9242 2454918.375000000 99.88785 -61.53341 53.552 154.0045 139.79 +61.70 226.60 +2.92 359.8936 0.998081183953 0.11420640279232 85.9259 2454918.416666667 99.89224 -61.53227 53.551 154.0013 124.75 +61.70 211.60 +2.94 359.8936 0.998093028152 0.11420877502549 85.9275 2454918.458333333 99.89662 -61.53113 53.549 153.9982 109.72 +61.70 196.59 +2.96 359.8937 0.998104870767 0.11421108782968 85.9291 2454918.500000000 99.90101 -61.53000 53.548 153.9951 94.68 +61.70 181.59 +2.97 359.8937 0.998116711796 0.11421334120812 85.9308 2454918.541666667 99.90539 -61.52886 53.547 153.9922 79.64 +61.70 166.59 +2.99 359.8937 0.998128551237 0.11421553516410 85.9324 2454918.583333333 99.90977 -61.52772 53.545 153.9893 64.61 +61.70 151.58 +3.01 359.8937 0.998140389090 0.11421766970102 85.9341 2454918.625000000 99.91415 -61.52658 53.544 153.9865 49.57 +61.70 136.58 +3.02 359.8937 0.998152225353 0.11421974482233 85.9357 2454918.666666667 99.91854 -61.52544 53.542 153.9838 34.53 +61.70 121.58 +3.04 359.8937 0.998164060025 0.11422176053158 85.9374 2454918.708333333 99.92292 -61.52430 53.541 153.9811 19.50 +61.69 106.58 +3.06 359.8937 0.998175893106 0.11422371683238 85.9390 2454918.750000000 99.92729 -61.52315 53.539 153.9786 4.46 +61.69 91.57 +3.07 359.8937 0.998187724596 0.11422561372843 85.9407 2454918.791666667 99.93167 -61.52201 53.538 153.9761 349.42 +61.69 76.57 +3.09 359.8937 0.998199554493 0.11422745122352 85.9424 2454918.833333333 99.93605 -61.52087 53.536 153.9737 334.39 +61.69 61.57 +3.11 359.8937 0.998211382799 0.11422922932149 85.9440 2454918.875000000 99.94043 -61.51972 53.535 153.9714 319.35 +61.69 46.56 +3.12 359.8937 0.998223209514 0.11423094802629 85.9457 2454918.916666667 99.94480 -61.51858 53.534 153.9691 304.31 +61.69 31.56 +3.14 359.8937 0.998235034637 0.11423260734191 85.9474 2454918.958333333 99.94918 -61.51743 53.532 153.9670 289.28 +61.69 16.56 +3.15 359.8937 0.998246858171 0.11423420727246 85.9491 2454919.000000000 99.95355 -61.51629 53.531 153.9649 274.24 +61.69 1.55 +3.17 359.8937 0.998258680116 0.11423574782210 85.9508 2454919.041666667 99.95792 -61.51514 53.529 153.9629 259.20 +61.69 346.55 +3.19 359.8937 0.998270500473 0.11423722899508 85.9525 2454919.083333333 99.96230 -61.51400 53.528 153.9610 244.17 +61.68 331.55 +3.20 359.8937 0.998282319245 0.11423865079571 85.9542 2454919.125000000 99.96667 -61.51285 53.526 153.9592 229.13 +61.68 316.54 +3.22 359.8937 0.998294136432 0.11424001322840 85.9559 2454919.166666667 99.97104 -61.51170 53.525 153.9574 214.09 +61.68 301.54 +3.24 359.8937 0.998305952037 0.11424131629763 85.9576 2454919.208333333 99.97541 -61.51055 53.523 153.9557 199.06 +61.68 286.54 +3.25 359.8937 0.998317766061 0.11424256000795 85.9593 2454919.250000000 99.97978 -61.50940 53.522 153.9541 184.02 +61.68 271.53 +3.27 359.8937 0.998329578508 0.11424374436399 85.9610 2454919.291666667 99.98414 -61.50825 53.520 153.9526 168.98 +61.68 256.53 +3.29 359.8937 0.998341389381 0.11424486937045 85.9627 2454919.333333333 99.98851 -61.50710 53.519 153.9512 153.95 +61.68 241.53 +3.30 359.8937 0.998353198681 0.11424593503213 85.9644 2454919.375000000 99.99288 -61.50594 53.517 153.9498 138.91 +61.68 226.53 +3.32 359.8937 0.998365006413 0.11424694135387 85.9661 2454919.416666667 99.99724 -61.50479 53.516 153.9485 123.87 +61.67 211.52 +3.33 359.8937 0.998376812579 0.11424788834062 85.9679 2454919.458333333 100.00161 -61.50364 53.514 153.9474 108.84 +61.67 196.52 +3.35 359.8937 0.998388617184 0.11424877599738 85.9696 2454919.500000000 100.00597 -61.50248 53.513 153.9462 93.80 +61.67 181.52 +3.37 359.8938 0.998400420231 0.11424960432924 85.9713 SUBSCLON = 360 - SUBSCLON SUBSCLON[19:*] = 360 + SUBSCLON[19:*] SUBSUNLO = 360 - SUBSUNLO SUBSUNLO[ 1:*] = 360 + SUBSUNLO[ 1:*] SUBSUNLO[25:*] = 360 + SUBSUNLO[25:*]