EPOXI/EPOCh - Geometry for 18-19 March 2008 Earth Equatorial Observation #1 The EPOCh team provided the following observational geometry values covering the 18-19 March Earth Equatorial 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% ----------------------- -------------- ----- ----- ------- ------- ------ ------- 2008-03-18T18:19:19.428 2454544.263419 149.9 1.7 0.18195 0.99553 57.520 76.846 2008-03-18T18:34:20.520 2454544.273849 153.7 1.7 0.18198 0.99553 57.523 76.844 2008-03-18T18:49:14.156 2454544.284192 157.4 1.7 0.18201 0.99553 57.527 76.842 2008-03-18T19:04:20.553 2454544.294682 161.2 1.7 0.18204 0.99554 57.530 76.839 2008-03-18T19:19:18.229 2454544.305072 164.9 1.7 0.18207 0.99554 57.533 76.837 2008-03-18T19:34:20.497 2454544.315515 168.7 1.7 0.18209 0.99554 57.536 76.835 2008-03-18T19:49:14.066 2454544.325857 172.4 1.7 0.18212 0.99554 57.539 76.833 2008-03-18T20:04:20.534 2454544.336349 176.2 1.7 0.18215 0.99555 57.542 76.830 2008-03-18T20:19:18.217 2454544.346739 179.9 1.7 0.18218 0.99555 57.545 76.828 2008-03-18T20:34:20.477 2454544.357181 183.7 1.7 0.18220 0.99555 57.548 76.826 2008-03-18T20:49:14.058 2454544.367524 187.4 1.7 0.18223 0.99556 57.551 76.824 2008-03-18T21:04:20.514 2454544.378015 191.2 1.7 0.18226 0.99556 57.554 76.821 2008-03-18T21:19:18.198 2454544.388405 194.9 1.7 0.18229 0.99556 57.557 76.819 2008-03-18T21:34:20.454 2454544.398848 198.7 1.7 0.18232 0.99556 57.560 76.817 2008-03-18T21:49:14.039 2454544.409190 202.4 1.7 0.18234 0.99557 57.563 76.815 2008-03-18T22:04:20.397 2454544.419680 206.2 1.7 0.18237 0.99557 57.566 76.812 2008-03-18T22:19:18.166 2454544.430071 210.0 1.6 0.18240 0.99557 57.569 76.810 2008-03-18T22:34:20.434 2454544.440514 213.7 1.6 0.18243 0.99558 57.572 76.808 2008-03-18T22:49:14.000 2454544.450856 217.5 1.6 0.18245 0.99558 57.575 76.806 2008-03-18T23:04:20.374 2454544.461347 221.2 1.6 0.18248 0.99558 57.578 76.803 2008-03-18T23:19:18.143 2454544.471738 225.0 1.6 0.18251 0.99558 57.582 76.801 2008-03-18T23:34:20.411 2454544.482181 228.7 1.6 0.18254 0.99559 57.585 76.799 2008-03-18T23:49:13.906 2454544.492522 232.5 1.6 0.18257 0.99559 57.588 76.797 2008-03-19T00:04:20.354 2454544.503013 236.2 1.6 0.18259 0.99559 57.591 76.794 2008-03-19T00:19:18.112 2454544.513404 240.0 1.6 0.18262 0.99560 57.594 76.792 2008-03-19T00:34:20.391 2454544.523847 243.8 1.6 0.18265 0.99560 57.597 76.790 2008-03-19T00:49:13.886 2454544.534189 247.5 1.6 0.18268 0.99560 57.600 76.788 2008-03-19T01:04:20.343 2454544.544680 251.3 1.6 0.18270 0.99560 57.603 76.785 2008-03-19T01:19:18.042 2454544.555070 255.0 1.6 0.18273 0.99561 57.606 76.783 2008-03-19T01:34:20.286 2454544.565513 258.8 1.6 0.18276 0.99561 57.609 76.781 2008-03-19T01:49:13.867 2454544.575855 262.5 1.6 0.18279 0.99561 57.612 76.779 2008-03-19T02:04:20.323 2454544.586346 266.3 1.6 0.18282 0.99562 57.615 76.776 2008-03-19T02:19:18.022 2454544.596736 270.0 1.6 0.18284 0.99562 57.618 76.774 2008-03-19T02:34:20.255 2454544.607179 273.8 1.6 0.18287 0.99562 57.621 76.772 2008-03-19T02:49:13.855 2454544.617522 277.5 1.6 0.18290 0.99562 57.624 76.770 2008-03-19T03:04:20.292 2454544.628013 281.3 1.6 0.18293 0.99563 57.627 76.767 2008-03-19T03:19:17.917 2454544.638402 285.0 1.6 0.18295 0.99563 57.630 76.765 2008-03-19T03:34:20.188 2454544.648845 288.8 1.6 0.18298 0.99563 57.633 76.763 2008-03-19T03:49:13.758 2454544.659187 292.5 1.6 0.18301 0.99564 57.636 76.761 2008-03-19T04:04:20.225 2454544.669678 296.3 1.6 0.18304 0.99564 57.640 76.758 2008-03-19T04:19:17.897 2454544.680068 300.1 1.6 0.18307 0.99564 57.643 76.756 2008-03-19T04:34:20.165 2454544.690511 303.8 1.6 0.18309 0.99564 57.646 76.754 2008-03-19T04:49:13.738 2454544.700854 307.5 1.6 0.18312 0.99565 57.649 76.752 2008-03-19T05:04:20.202 2454544.711345 311.3 1.6 0.18315 0.99565 57.652 76.749 2008-03-19T05:19:17.878 2454544.721735 315.1 1.6 0.18318 0.99565 57.655 76.747 2008-03-19T05:34:20.145 2454544.732178 318.8 1.6 0.18320 0.99566 57.658 76.745 2008-03-19T05:49:13.726 2454544.742520 322.6 1.6 0.18323 0.99566 57.661 76.743 2008-03-19T06:04:20.085 2454544.753010 326.3 1.6 0.18326 0.99566 57.664 76.740 2008-03-19T06:19:17.862 2454544.763401 330.1 1.6 0.18329 0.99566 57.667 76.738 2008-03-19T06:34:20.122 2454544.773844 333.8 1.6 0.18332 0.99567 57.670 76.736 2008-03-19T06:49:13.664 2454544.784186 337.6 1.6 0.18334 0.99567 57.673 76.734 2008-03-19T07:04:20.065 2454544.794677 341.4 1.6 0.18337 0.99567 57.676 76.731 2008-03-19T07:19:17.831 2454544.805068 345.1 1.6 0.18340 0.99568 57.679 76.729 2008-03-19T07:34:20.103 2454544.815510 348.9 1.6 0.18343 0.99568 57.682 76.727 2008-03-19T07:49:13.644 2454544.825852 352.6 1.6 0.18345 0.99568 57.685 76.725 2008-03-19T08:04:20.042 2454544.836343 356.4 1.6 0.18348 0.99568 57.688 76.722 2008-03-19T08:19:17.811 2454544.846734 0.1 1.6 0.18351 0.99569 57.691 76.720 2008-03-19T08:34:20.079 2454544.857177 3.9 1.6 0.18354 0.99569 57.694 76.718 2008-03-19T08:49:13.574 2454544.867518 7.6 1.6 0.18356 0.99569 57.697 76.716 2008-03-19T09:04:20.023 2454544.878009 11.4 1.6 0.18359 0.99570 57.700 76.713 2008-03-19T09:19:17.780 2454544.888400 15.1 1.6 0.18362 0.99570 57.704 76.711 2008-03-19T09:34:19.974 2454544.898842 18.9 1.6 0.18365 0.99570 57.707 76.709 2008-03-19T09:49:13.555 2454544.909185 22.6 1.6 0.18368 0.99570 57.710 76.707 2008-03-19T10:04:20.011 2454544.919676 26.4 1.6 0.18370 0.99571 57.713 76.704 2008-03-19T10:19:17.710 2454544.930066 30.1 1.6 0.18373 0.99571 57.716 76.702 2008-03-19T10:34:19.943 2454544.940509 33.9 1.6 0.18376 0.99571 57.719 76.700 2008-03-19T10:49:13.477 2454544.950850 37.6 1.6 0.18379 0.99572 57.722 76.698 2008-03-19T11:04:19.980 2454544.961342 41.4 1.6 0.18382 0.99572 57.725 76.695 2008-03-19T11:19:17.608 2454544.971732 45.2 1.6 0.18384 0.99572 57.728 76.693 2008-03-19T11:34:19.923 2454544.982175 48.9 1.5 0.18387 0.99572 57.731 76.691 2008-03-19T11:49:13.449 2454544.992517 52.7 1.5 0.18390 0.99573 57.734 76.689 2008-03-19T12:04:19.960 2454545.003009 56.4 1.5 0.18393 0.99573 57.737 76.686 2008-03-19T12:19:17.589 2454545.013398 60.2 1.5 0.18395 0.99573 57.740 76.684 2008-03-19T12:34:19.857 2454545.023841 63.9 1.5 0.18398 0.99574 57.743 76.682 2008-03-19T12:49:13.422 2454545.034183 67.7 1.5 0.18401 0.99574 57.746 76.680 2008-03-19T13:04:19.890 2454545.044675 71.5 1.5 0.18404 0.99574 57.749 76.677 2008-03-19T13:19:17.566 2454545.055064 75.2 1.5 0.18406 0.99574 57.752 76.675 2008-03-19T13:34:19.833 2454545.065507 79.0 1.5 0.18409 0.99575 57.755 76.673 2008-03-19T13:49:13.403 2454545.075850 82.7 1.5 0.18412 0.99575 57.758 76.671 2008-03-19T14:04:19.777 2454545.086340 86.5 1.5 0.18415 0.99575 57.761 76.668 2008-03-19T14:19:17.554 2454545.096731 90.2 1.5 0.18418 0.99576 57.764 76.666 2008-03-19T14:34:19.814 2454545.107174 94.0 1.5 0.18420 0.99576 57.767 76.664 2008-03-19T14:49:13.364 2454545.117516 97.7 1.5 0.18423 0.99576 57.770 76.662 2008-03-19T15:04:19.753 2454545.128006 101.5 1.5 0.18426 0.99577 57.774 76.659 2008-03-19T15:19:17.519 2454545.138397 105.2 1.5 0.18429 0.99577 57.777 76.657 2008-03-19T15:34:19.790 2454545.148840 109.0 1.5 0.18431 0.99577 57.780 76.655 2008-03-19T15:49:13.344 2454545.159182 112.7 1.5 0.18434 0.99577 57.783 76.653 2008-03-19T16:04:19.734 2454545.169673 116.5 1.5 0.18437 0.99578 57.786 76.650 2008-03-19T16:19:17.499 2454545.180064 120.2 1.5 0.18440 0.99578 57.789 76.648 2008-03-19T16:34:19.771 2454545.190507 124.0 1.5 0.18443 0.99578 57.792 76.646 2008-03-19T16:49:13.313 2454545.200848 127.8 1.5 0.18445 0.99579 57.795 76.644 2008-03-19T17:04:19.710 2454545.211339 131.5 1.5 0.18448 0.99579 57.798 76.642 2008-03-19T17:19:17.480 2454545.221730 135.3 1.5 0.18451 0.99579 57.801 76.640 2008-03-19T17:34:19.654 2454545.232172 139.0 1.5 0.18454 0.99579 57.804 76.638 2008-03-19T17:49:13.247 2454545.242514 142.7 1.5 0.18456 0.99580 57.807 76.636 2008-03-19T18:04:19.691 2454545.253006 146.5 1.5 0.18459 0.99580 57.810 76.633 2008-03-19T18:19:17.449 2454545.263396 150.3 1.5 0.18462 0.99580 57.813 76.631 ----------------------- -------------- ----- ----- ------- ------- ------ ------- 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 ------------------ --------- -------- ------ -------- ------ ----- ------ ----- -------- -------------- ---------------- ------- 2454544.250000000 121.04716 -1.65597 76.848 96.68595 214.93 +1.69 272.41 -0.60 359.9608 0.995522969675 0.18191160861605 57.5212 2454544.291666667 121.07199 -1.64822 76.839 96.62696 199.91 +1.68 257.41 -0.58 359.9608 0.995534417937 0.18202264976444 57.5335 2454544.333333333 121.09684 -1.64049 76.830 96.56805 184.90 +1.68 242.41 -0.56 359.9608 0.995545870343 0.18213369215916 57.5457 2454544.375000000 121.12170 -1.63276 76.821 96.50921 169.88 +1.67 227.40 -0.55 359.9608 0.995557326897 0.18224473577059 57.5579 2454544.416666667 121.14658 -1.62504 76.812 96.45044 154.86 +1.66 212.40 -0.53 359.9609 0.995568787605 0.18235578054247 57.5702 2454544.458333333 121.17146 -1.61732 76.803 96.39175 139.85 +1.65 197.40 -0.51 359.9609 0.995580252469 0.18246682639193 57.5824 2454544.500000000 121.19636 -1.60962 76.794 96.33312 124.83 +1.64 182.40 -0.50 359.9609 0.995591721493 0.18257787326230 57.5946 2454544.541666667 121.22127 -1.60192 76.785 96.27456 109.82 +1.64 167.39 -0.48 359.9609 0.995603194682 0.18268892109672 57.6068 2454544.583333333 121.24619 -1.59423 76.776 96.21608 94.80 +1.63 152.39 -0.46 359.9609 0.995614672040 0.18279996983813 57.6190 2454544.625000000 121.27112 -1.58654 76.767 96.15766 79.78 +1.62 137.39 -0.45 359.9609 0.995626153568 0.18291101942927 57.6312 2454544.666666667 121.29607 -1.57887 76.758 96.09932 64.77 +1.61 122.38 -0.43 359.9609 0.995637639271 0.18302206981268 57.6434 2454544.708333333 121.32102 -1.57120 76.749 96.04104 49.75 +1.61 107.38 -0.41 359.9609 0.995649129151 0.18313312093073 57.6556 2454544.750000000 121.34599 -1.56354 76.740 95.98284 34.74 +1.60 92.38 -0.40 359.9609 0.995660623212 0.18324417272556 57.6678 2454544.791666667 121.37097 -1.55589 76.731 95.92471 19.72 +1.59 77.38 -0.38 359.9609 0.995672121455 0.18335522513916 57.6800 2454544.833333333 121.39596 -1.54824 76.722 95.86664 4.70 +1.58 62.37 -0.36 359.9610 0.995683623884 0.18346627811330 57.6922 2454544.845833333 121.40346 -1.54595 76.719 95.84924 0.20 +1.58 57.87 -0.36 359.9610 0.995687075429 0.18349959410613 57.6959 2454544.846527778 121.40388 -1.54582 76.719 95.84827 359.95 +1.58 57.62 -0.36 359.9610 0.995687267193 0.18350144499591 57.6961 2454544.875000000 121.42097 -1.54060 76.713 95.80865 349.69 +1.58 47.37 -0.35 359.9610 0.995695130500 0.18357733158958 57.7044 2454544.916666667 121.44598 -1.53297 76.704 95.75073 334.67 +1.57 32.37 -0.33 359.9610 0.995706641306 0.18368838550940 57.7166 2454544.958333333 121.47101 -1.52535 76.695 95.69287 319.66 +1.56 17.36 -0.31 359.9610 0.995718156302 0.18379943981399 57.7288 2454545.000000000 121.49605 -1.51774 76.686 95.63509 304.64 +1.55 2.36 -0.30 359.9610 0.995729675492 0.18391049444440 57.7409 2454545.006250000 121.49980 -1.51660 76.684 95.62643 302.39 +1.55 0.11 -0.29 359.9610 0.995731403733 0.18392715266340 57.7428 2454545.006944444 121.50022 -1.51647 76.684 95.62546 302.14 +1.55 359.86 -0.29 359.9610 0.995731595765 0.18392900357699 57.7430 2454545.041666667 121.52110 -1.51013 76.677 95.57737 289.63 +1.54 347.36 -0.28 359.9610 0.995741198877 0.18402154934147 57.7531 2454545.083333333 121.54616 -1.50253 76.668 95.51973 274.61 +1.54 332.36 -0.26 359.9610 0.995752726457 0.18413260444590 57.7653 2454545.125000000 121.57124 -1.49494 76.659 95.46215 259.59 +1.53 317.35 -0.25 359.9610 0.995764258234 0.18424365969818 57.7774 2454545.166666667 121.59632 -1.48736 76.650 95.40464 244.58 +1.52 302.35 -0.23 359.9610 0.995775794209 0.18435471503865 57.7896 2454545.208333333 121.62142 -1.47978 76.641 95.34721 229.56 +1.51 287.35 -0.21 359.9610 0.995787334382 0.18446577040745 57.8018 2454545.250000000 121.64653 -1.47222 76.632 95.28984 214.55 +1.51 272.34 -0.20 359.9611 0.995798878755 0.18457682574457 57.8139 2454545.291666667 121.67165 -1.46466 76.623 95.23254 199.53 +1.50 257.34 -0.18 359.9611 0.995810427327 0.18468788098983 57.8261 2454545.333333333 121.69679 -1.45710 76.614 95.17531 184.52 +1.49 242.34 -0.16 359.9611 0.995821980098 0.18479893608284 57.8382 SUBSCLON = 360 - SUBSCLON SUBSCLON[16:*] = 360 + SUBSCLON[16:*] SUBSUNLO = 360 - SUBSUNLO SUBSUNLO[22:*] = 360 + SUBSUNLO[22:*]