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. Table 1 - Reduced observational geometry parameters constructed by interpolating values in the raw look-up table (Table 2). Each of the quantities that is reported in the table is the median from the four or seven images that was collected on each 15-minute interval. 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 (planetographic**) Lat = subspacecraft latitude on Earth (planetographic**) 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 ** The oblateness of Earth is so tiny that the distinction between planetographic and planetocentric latitude is much less than the tenth-of-a-degree resolution used here. West longitude is used here for Earth, since Earth is an ordinary planet for EPOXI, like any other. Table 2 - Raw Observational Geometry Look-Up Table from HORIZONS system maintained by the JPL Solar System. 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 *East* longitude (planetographic), converted to West longitude at the end SUBSCLAT = JULIAN ; subspacecraft latitude (planetographic) SUBSUNLO = JULIAN ; subSun *East* longitude (planetographic), converted to West longitude at the end SUBSUNLA = JULIAN ; SubSun latitude (planetographic) 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 Convert from East to West longitude: SUBSCLON = 360 - SUBSCLON SUBSCLON[16:*] = 360 + SUBSCLON[16:*] SUBSUNLO = 360 - SUBSUNLO SUBSUNLO[22:*] = 360 + SUBSUNLO[22:*]