Source: JPL Horizons: NOTE: No new measurements since July 15 despite some potential unmodeled thruster pulses just prior to that. However, Arecibo signal strength on August 5th suggests s41 was within ~100 arcsec of actual. ICE may be observable visually at mag. 19-20 over the Aug 9-20 interval.
Nominal encounters for s41:
Date (CT) Body CA Dist MinDist MaxDist Vrel TCA3Sg Nsigs P_i/p
----------------- ----- ------- ------- ------- ------ ------ ------ -------
2014 Aug 09.13047 Earth .001235 .001149 .001318 2.638 186.04 40.915 .000000
2014 Aug 10.80979 Moon .000118 .000001 .000282 2.018 243.66 2.1921 .004321
UPDATE (2014-Jul-15): Trajectory updated to JPL solution #41 (s41), based on 48 coarse Arecibo plane-of-sky angular measurements spanning May 22 – Jul 15.
Plane-of-sky uncertainties (units are arcseconds, km, km/s):
Date__(UT)__HR:MN RA_3sigma DEC_3sigma RNG_3sigma RNGRT_3sig
2014-Aug-02 00:00 780.766 642.014 14031.3850 0.0570105
2014-Aug-04 00:00 1479.369 1256.082 10321.1032 0.0552189
2014-Aug-05 00:00 2182.470 1885.499 11009.1841 0.0543265
2014-Aug-06 00:00 3478.347 3051.582 12681.5228 0.0538118
2014-Aug-07 00:00 6285.085 5509.371 13931.3196 0.0551457
2014-Aug-08 00:00 14020.531 11018.574 11569.0536 0.0645683
2014-Aug-10 00:00 7590.364 5316.623 27551.0800 0.0865967
2014-Aug-12 00:00 22710.084 17508.146 30241.9692 0.1064071
2014-Aug-14 00:00 31843.193 22694.977 18375.5356 0.0156532
2014-Aug-16 00:00 35268.764 24040.205 16171.9713 0.0269640
2014-Aug-18 00:00 36951.706 24472.608 33196.4787 0.0499405
2014-Aug-20 00:00 37896.044 24616.796 53638.2302 0.0630939
2014-Aug-22 00:00 38453.318 24650.921 74030.4945 0.0704983
2014-Aug-24 00:00 38773.710 24634.617 93572.7670 0.0742269
2014-Aug-26 00:00 38930.728 24588.886 111937.097 0.0754814
2014-Aug-28 00:00 38964.476 24520.542 128970.257 0.0750356
2014-Aug-30 00:00 38899.203 24431.021 144616.210 0.0734299
2014-Sep-01 00:00 38751.206 24319.948 158882.594 0.0710662
UPDATE (2014-Jul-10): Trajectory updated to JPL solution #36 (s36), based on 45 coarse Arecibo plane-of-sky angular measurements spanning May 22 – Jul 09.
UPDATE (2014-Jul-03): Trajectory update from ISEE-3 Reboot based on Arecibo angular data and DSN two-way Doppler.
UPDATE (2014-Jun-23): Trajectory updated to JPL solution #32 (s32), based on 42 coarse Arecibo plane-of-sky angular measurements spanning May 22 – Jun 23 … (not delay/Doppler).
UPDATE (2014-Jun-13): Trajectory updated to JPL solution #27 (s27), based on coarse Arecibo plane-of-sky angular measurements (not delay/Doppler).
UPDATE (2014-Jun-09): Trajectory updated to JPL solution #24 (s24), based on coarse Arecibo plane-of-sky angular measurements (not delay/Doppler).
UPDATE (2014-Jun-05): Trajectory updated to JPL solution #21 (s21), based on coarse Arecibo plane-of-sky angular measurements (not delay/Doppler).
UPDATE (2014-Jun-03): Trajectory updated to JPL solution #17 (s17), based on coarse Arecibo plane-of-sky angular measurements (not delay/Doppler).
UPDATE (2014-Jun-01): The trajectory has been updated to JPL solution #6 (s6), based on coarse Arecibo plane-of-sky angular measurements (not delay/Doppler).
UPDATE (2014-May-23): While too distant/small for radar echos, Arecibo obtained one plane-of-sky measurement about 0.39 deg (RSS) from this trajectory. A full, three dimensional orbit solution update is not yet possible, but will be made available here if/when it is.
UPDATE (2014-Mar-10): Reacquired carrier signal by AMSAT-DL/Bochum: http://www.amsat-dl.org/index.php/news-mainmenu-97/199-ice-satellite-received-in-bochum
*******************************************************************************
Ephemeris / WWW_USER Sat Aug 9 12:26:38 2014 Pasadena, USA / Horizons
*******************************************************************************
Target body name: ICE Spacecraft (-111) {source: Horizons_SPK:user_input_}
Center body name: Earth (399) {source: DE-0431LE-0431}
Center-site name: (user defined site below)
*******************************************************************************
Start time : A.D. 2014-Aug-09 00:00:00.0000 UT
Stop time : A.D. 2014-Aug-12 00:00:00.0000 UT
Step-size : 20 minutes
*******************************************************************************
Target pole/equ : No model available
Target radii : (unavailable)
Center geodetic : 237.920000,37.3883000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 237.920000,5073.94206,3851.7214 {E-lon(deg),Dxy(km),Dz(km)}
Center pole/equ : High-precision EOP model {East-longitude +}
Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole}
Target primary : Earth
Vis. interferer : MOON (R_eq= 1737.400) km {source: DE-0431LE-0431}
Rel. light bend : Sun, EARTH {source: DE-0431LE-0431}
Rel. lght bnd GM: 1.3271E+11, 3.9860E+05 km^3/s^2
Atmos refraction: NO (AIRLESS)
RA format : DEG
Time format : CAL
RTS-only print : NO
EOP file : eop.140808.p141030
EOP coverage : DATA-BASED 1962-JAN-20 TO 2014-AUG-08. PREDICTS-> 2014-OCT-29
Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s
Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )
Table cut-offs 2: Solar Elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO )
*****************************************************************************************
Date__(UT)__HR:MN R.A._(J2000.0)_DEC. Azi_(a-appr)_Elev delta deldot
*****************************************************************************************
$$SOE
2014-Aug-09 00:00 * 227.93876 -43.21250 156.6710 4.0030 1.8584316492E+05 -0.3827190
2014-Aug-09 00:20 * 229.09423 -43.41758 159.3199 4.9653 1.8540882444E+05 -0.3410627
2014-Aug-09 00:40 * 230.25443 -43.60477 161.9996 5.8057 1.8502466348E+05 -0.2991035
2014-Aug-09 01:00 * 231.41907 -43.77352 164.7058 6.5227 1.8469101220E+05 -0.2568964
2014-Aug-09 01:20 * 232.58786 -43.92332 167.4344 7.1148 1.8440813676E+05 -0.2144930
2014-Aug-09 01:40 *m 233.76050 -44.05374 170.1803 7.5810 1.8417624307E+05 -0.1719422
2014-Aug-09 02:00 *m 234.93668 -44.16439 172.9386 7.9206 1.8399548024E+05 -0.1292899
2014-Aug-09 02:20 *m 236.11607 -44.25498 175.7040 8.1334 1.8386594375E+05 -0.0865795
2014-Aug-09 02:40 *m 237.29833 -44.32526 178.4710 8.2193 1.8378767822E+05 -0.0438525
2014-Aug-09 03:00 *t 238.48312 -44.37507 181.2343 8.1787 1.8376067962E+05 -0.0011485
2014-Aug-09 03:20 Cm 239.67006 -44.40432 183.9884 8.0125 1.8378489701E+05 0.0414940
2014-Aug-09 03:40 Nm 240.85879 -44.41299 186.7282 7.7216 1.8386023375E+05 0.0840370
2014-Aug-09 04:00 Nm 242.04891 -44.40114 189.4488 7.3074 1.8398654801E+05 0.1264432
2014-Aug-09 04:20 Am 243.24003 -44.36889 192.1455 6.7716 1.8416365283E+05 0.1686747
2014-Aug-09 04:40 Am 244.43173 -44.31643 194.8140 6.1159 1.8439131550E+05 0.2106929
2014-Aug-09 05:00 m 245.62360 -44.24405 197.4505 5.3426 1.8466925644E+05 0.2524583
2014-Aug-09 05:20 m 246.81521 -44.15208 200.0514 4.4539 1.8499714756E+05 0.2939297
2014-Aug-09 05:40 m 248.00611 -44.04091 202.6140 3.4522 1.8537461020E+05 0.3350638
2014-Aug-09 06:00 m 249.19586 -43.91102 205.1358 2.3401 1.8580121264E+05 0.3758153
2014-Aug-09 06:20 m 250.38402 -43.76293 207.6147 1.1204 1.8627646738E+05 0.4161367
2014-Aug-09 06:40 m 251.57013 -43.59721 210.0494 -0.2043 1.8679982811E+05 0.4559775
2014-Aug-09 07:00 s 252.75372 -43.41449 212.4388 -1.6311 1.8737068670E+05 0.4952850
2014-Aug-09 07:20 m 253.93434 -43.21545 214.7823 -3.1572 1.8798837005E+05 0.5340038
2014-Aug-09 07:40 m 255.11151 -43.00080 217.0798 -4.7797 1.8865213711E+05 0.5720761
2014-Aug-09 08:00 m 256.28479 -42.77129 219.3316 -6.4956 1.8936117608E+05 0.6094417
2014-Aug-09 08:20 m 257.45370 -42.52771 221.5383 -8.3022 1.9011460185E+05 0.6460388
2014-Aug-09 08:40 m 258.61777 -42.27086 223.7009 -10.1965 1.9091145396E+05 0.6818036
2014-Aug-09 09:00 m 259.77656 -42.00158 225.8207 -12.1757 1.9175069487E+05 0.7166716
2014-Aug-09 09:20 m 260.92959 -41.72070 227.8995 -14.2370 1.9263120900E+05 0.7505773
2014-Aug-09 09:40 m 262.07642 -41.42908 229.9392 -16.3775 1.9355180220E+05 0.7834554
2014-Aug-09 10:00 m 263.21658 -41.12759 231.9421 -18.5946 1.9451120216E+05 0.8152410
2014-Aug-09 10:20 m 264.34964 -40.81708 233.9109 -20.8855 1.9550805936E+05 0.8458705
2014-Aug-09 10:40 m 265.47514 -40.49840 235.8483 -23.2476 1.9654094898E+05 0.8752821
2014-Aug-09 11:00 m 266.59265 -40.17241 237.7579 -25.6783 1.9760837360E+05 0.9034167
2014-Aug-09 11:20 m 267.70172 -39.83993 239.6432 -28.1749 1.9870876668E+05 0.9302183
2014-Aug-09 11:40 m 268.80193 -39.50178 241.5085 -30.7349 1.9984049700E+05 0.9556352
2014-Aug-09 12:00 Am 269.89285 -39.15875 243.3587 -33.3559 2.0100187383E+05 0.9796201
2014-Aug-09 12:20 N 270.97405 -38.81161 245.1993 -36.0353 2.0219115301E+05 1.0021313
2014-Aug-09 12:40 N 272.04511 -38.46111 247.0366 -38.7708 2.0340654374E+05 1.0231330
2014-Aug-09 13:00 C 273.10563 -38.10795 248.8785 -41.5598 2.0464621617E+05 1.0425959
2014-Aug-09 13:20 * 274.15519 -37.75282 250.7342 -44.4000 2.0590830963E+05 1.0604980
2014-Aug-09 13:40 * 275.19338 -37.39635 252.6152 -47.2889 2.0719094150E+05 1.0768248
2014-Aug-09 14:00 * 276.21980 -37.03916 254.5363 -50.2239 2.0849221668E+05 1.0915701
2014-Aug-09 14:20 * 277.23407 -36.68182 256.5164 -53.2024 2.0981023751E+05 1.1047359
2014-Aug-09 14:40 * 278.23577 -36.32486 258.5811 -56.2215 2.1114311410E+05 1.1163330
2014-Aug-09 15:00 * 279.22454 -35.96877 260.7660 -59.2779 2.1248897499E+05 1.1263815
2014-Aug-09 15:20 * 280.19999 -35.61402 263.1222 -62.3680 2.1384597810E+05 1.1349103
2014-Aug-09 15:40 * 281.16174 -35.26101 265.7269 -65.4867 2.1521232173E+05 1.1419578
2014-Aug-09 16:00 * 282.10942 -34.91012 268.7023 -68.6273 2.1658625577E+05 1.1475715
2014-Aug-09 16:20 * 283.04268 -34.56169 272.2548 -71.7797 2.1796609276E+05 1.1518082
2014-Aug-09 16:40 * 283.96116 -34.21602 276.7605 -74.9260 2.1935021894E+05 1.1547340
2014-Aug-09 17:00 * 284.86451 -33.87335 282.9754 -78.0318 2.2073710503E+05 1.1564236
2014-Aug-09 17:20 * 285.75240 -33.53393 292.6074 -81.0164 2.2212531677E+05 1.1569604
2014-Aug-09 17:40 * 286.62450 -33.19794 309.9086 -83.6545 2.2351352509E+05 1.1564364
2014-Aug-09 18:00 * 287.48049 -32.86552 342.9518 -85.2532 2.2490051581E+05 1.1549510
2014-Aug-09 18:20 * 288.32008 -32.53679 23.6769 -84.7015 2.2628519882E+05 1.1526113
2014-Aug-09 18:40 * 289.14297 -32.21185 48.5989 -82.4219 2.2766661663E+05 1.1495312
2014-Aug-09 19:00 * 289.94888 -31.89074 61.6015 -79.4602 2.2904395225E+05 1.1458309
2014-Aug-09 19:20 * 290.73757 -31.57350 69.3582 -76.2338 2.3041653625E+05 1.1416361
2014-Aug-09 19:40 * 291.50880 -31.26012 74.6608 -72.8797 2.3178385309E+05 1.1370772
2014-Aug-09 20:00 * 292.26233 -30.95057 78.6702 -69.4515 2.3314554640E+05 1.1322890
2014-Aug-09 20:20 * 292.99798 -30.64480 81.9297 -65.9741 2.3450142339E+05 1.1274093
2014-Aug-09 20:40 * 293.71558 -30.34273 84.7232 -62.4614 2.3585145817E+05 1.1225782
2014-Aug-09 21:00 * 294.41496 -30.04427 87.2128 -58.9219 2.3719579401E+05 1.1179373
2014-Aug-09 21:20 * 295.09602 -29.74930 89.4984 -55.3616 2.3853474436E+05 1.1136286
2014-Aug-09 21:40 * 295.75866 -29.45768 91.6448 -51.7852 2.3986879282E+05 1.1097934
2014-Aug-09 22:00 * 296.40282 -29.16927 93.6969 -48.1968 2.4119859171E+05 1.1065715
2014-Aug-09 22:20 * 297.02847 -28.88389 95.6872 -44.6001 2.4252495947E+05 1.1040997
2014-Aug-09 22:40 * 297.63562 -28.60139 97.6403 -40.9985 2.4384887670E+05 1.1025112
2014-Aug-09 23:00 * 298.22431 -28.32156 99.5757 -37.3958 2.4517148088E+05 1.1019342
2014-Aug-09 23:20 * 298.79462 -28.04423 101.5094 -33.7956 2.4649405979E+05 1.1024908
2014-Aug-09 23:40 * 299.34667 -27.76917 103.4554 -30.2018 2.4781804349E+05 1.1042959
2014-Aug-10 00:00 * 299.88063 -27.49620 105.4263 -26.6188 2.4914499513E+05 1.1074561
2014-Aug-10 00:20 * 300.39671 -27.22511 107.4337 -23.0511 2.5047660029E+05 1.1120687
2014-Aug-10 00:40 * 300.89514 -26.95569 109.4888 -19.5040 2.5181465519E+05 1.1182207
2014-Aug-10 01:00 * 301.37622 -26.68774 111.6026 -15.9829 2.5316105361E+05 1.1259875
2014-Aug-10 01:20 * 301.84029 -26.42106 113.7865 -12.4943 2.5451777266E+05 1.1354324
2014-Aug-10 01:40 * 302.28773 -26.15545 116.0518 -9.0451 2.5588685756E+05 1.1466056
2014-Aug-10 02:00 * 302.71895 -25.89073 118.4106 -5.6433 2.5727040535E+05 1.1595431
2014-Aug-10 02:20 *m 303.13444 -25.62673 120.8752 -2.2977 2.5867054785E+05 1.1742667
2014-Aug-10 02:40 *r 303.53469 -25.36327 123.4587 0.9817 2.6008943383E+05 1.1907828
2014-Aug-10 03:00 *m 303.92026 -25.10021 126.1747 4.1837 2.6152921062E+05 1.2090826
2014-Aug-10 03:20 Cm 304.29173 -24.83742 129.0374 7.2957 2.6299200529E+05 1.2291411
2014-Aug-10 03:40 Nm 304.64973 -24.57476 132.0612 10.3036 2.6447990567E+05 1.2509178
2014-Aug-10 04:00 Nm 304.99492 -24.31214 135.2604 13.1917 2.6599494112E+05 1.2743560
2014-Aug-10 04:20 Am 305.32797 -24.04947 138.6487 15.9423 2.6753906366E+05 1.2993833
2014-Aug-10 04:40 Am 305.64962 -23.78669 142.2388 18.5363 2.6911412921E+05 1.3259122
2014-Aug-10 05:00 m 305.96059 -23.52374 146.0408 20.9526 2.7072187947E+05 1.3538399
2014-Aug-10 05:20 m 306.26163 -23.26061 150.0615 23.1690 2.7236392453E+05 1.3830499
2014-Aug-10 05:40 m 306.55353 -22.99727 154.3028 25.1618 2.7404172631E+05 1.4134120
2014-Aug-10 06:00 m 306.83705 -22.73376 158.7601 26.9070 2.7575658321E+05 1.4447840
2014-Aug-10 06:20 m 307.11298 -22.47009 163.4211 28.3812 2.7750961598E+05 1.4770123
2014-Aug-10 06:40 m 307.38210 -22.20632 168.2645 29.5620 2.7930175508E+05 1.5099335
2014-Aug-10 07:00 m 307.64519 -21.94252 173.2600 30.4300 2.8113372969E+05 1.5433758
2014-Aug-10 07:20 m 307.90303 -21.67877 178.3685 30.9697 2.8300605836E+05 1.5771603
2014-Aug-10 07:40 m 308.15635 -21.41518 183.5443 31.1706 2.8491904167E+05 1.6111029
2014-Aug-10 08:00 t 308.40590 -21.15186 188.7377 31.0281 2.8687275673E+05 1.6450155
2014-Aug-10 08:20 m 308.65239 -20.88894 193.8986 30.5440 2.8886705374E+05 1.6787082
2014-Aug-10 08:40 m 308.89649 -20.62657 198.9799 29.7262 2.9090155464E+05 1.7119909
2014-Aug-10 09:00 m 309.13885 -20.36488 203.9407 28.5878 2.9297565380E+05 1.7446747
2014-Aug-10 09:20 m 309.38009 -20.10404 208.7483 27.1465 2.9508852084E+05 1.7765741
2014-Aug-10 09:40 m 309.62078 -19.84421 213.3794 25.4232 2.9723910546E+05 1.8075085
2014-Aug-10 10:00 m 309.86146 -19.58556 217.8200 23.4406 2.9942614431E+05 1.8373036
2014-Aug-10 10:20 m 310.10261 -19.32825 222.0645 21.2222 3.0164816972E+05 1.8657935
2014-Aug-10 10:40 m 310.34468 -19.07245 226.1146 18.7915 3.0390352040E+05 1.8928216
2014-Aug-10 11:00 m 310.58805 -18.81833 229.9774 16.1711 3.0619035370E+05 1.9182425
2014-Aug-10 11:20 m 310.83309 -18.56604 233.6644 13.3824 3.0850665969E+05 1.9419229
2014-Aug-10 11:40 m 311.08008 -18.31574 237.1903 10.4451 3.1085027657E+05 1.9637432
2014-Aug-10 12:00 Am 311.32928 -18.06758 240.5716 7.3776 3.1321890750E+05 1.9835982
2014-Aug-10 12:20 Nm 311.58089 -17.82170 243.8261 4.1966 3.1561013867E+05 2.0013983
2014-Aug-10 12:40 Nm 311.83507 -17.57823 246.9728 0.9171 3.1802145838E+05 2.0170700
2014-Aug-10 13:00 Cs 312.09191 -17.33728 250.0309 -2.4469 3.2045027706E+05 2.0305570
2014-Aug-10 13:20 C 312.35149 -17.09896 253.0205 -5.8828 3.2289394800E+05 2.0418206
2014-Aug-10 13:40 * 312.61382 -16.86336 255.9620 -9.3790 3.2534978859E+05 2.0508398
2014-Aug-10 14:00 * 312.87889 -16.63055 258.8771 -12.9244 3.2781510202E+05 2.0576117
2014-Aug-10 14:20 * 313.14662 -16.40059 261.7882 -16.5087 3.3028719885E+05 2.0621515
2014-Aug-10 14:40 * 313.41694 -16.17352 264.7200 -20.1216 3.3276341839E+05 2.0644919
2014-Aug-10 15:00 * 313.68971 -15.94935 267.6992 -23.7531 3.3524114927E+05 2.0646821
2014-Aug-10 15:20 * 313.96478 -15.72808 270.7563 -27.3925 3.3771784837E+05 2.0627863
2014-Aug-10 15:40 * 314.24198 -15.50970 273.9261 -31.0286 3.4019105715E+05 2.0588807
2014-Aug-10 16:00 * 314.52112 -15.29413 277.2494 -34.6488 3.4265841360E+05 2.0530490
2014-Aug-10 16:20 * 314.80200 -15.08130 280.7749 -38.2385 3.4511765733E+05 2.0453754
2014-Aug-10 16:40 * 315.08440 -14.87110 284.5618 -41.7804 3.4756662415E+05 2.0359339
2014-Aug-10 17:00 * 315.36813 -14.66338 288.6820 -45.2532 3.5000322521E+05 2.0247730
2014-Aug-10 17:20 * 315.65299 -14.45796 293.2239 -48.6301 3.5242540447E+05 2.0118952
2014-Aug-10 17:40 * 315.93881 -14.25463 298.2949 -51.8766 3.5483106901E+05 1.9972322
2014-Aug-10 18:00 * 316.22542 -14.05316 304.0227 -54.9477 3.5721799040E+05 1.9806237
2014-Aug-10 18:20 * 316.51267 -13.85331 310.5505 -57.7852 3.5958368820E+05 1.9618117
2014-Aug-10 18:40 * 316.80042 -13.65485 318.0222 -60.3143 3.6192532831E+05 1.9404749
2014-Aug-10 19:00 * 317.08847 -13.45762 326.5457 -62.4431 3.6423969679E+05 1.9163222
2014-Aug-10 19:20 * 317.37658 -13.26153 336.1306 -64.0663 3.6652331870E+05 1.8892353
2014-Aug-10 19:40 * 317.66437 -13.06661 346.6122 -65.0798 3.6877275096E+05 1.8594022
2014-Aug-10 20:00 * 317.95137 -12.87300 357.6107 -65.4034 3.7098498496E+05 1.8273539
2014-Aug-10 20:20 * 318.23699 -12.68091 8.5921 -65.0068 3.7315781287E+05 1.7938685
2014-Aug-10 20:40 * 318.52059 -12.49057 19.0265 -63.9201 3.7529002233E+05 1.7597967
2014-Aug-10 21:00 * 318.80149 -12.30219 28.5448 -62.2219 3.7738138392E+05 1.7259057
2014-Aug-10 21:20 * 319.07905 -12.11594 36.9923 -60.0145 3.7943249510E+05 1.6928001
2014-Aug-10 21:40 * 319.35268 -11.93195 44.3848 -57.4004 3.8144457528E+05 1.6609154
2014-Aug-10 22:00 * 319.62182 -11.75027 50.8327 -54.4688 3.8341928057E+05 1.6305508
2014-Aug-10 22:20 * 319.88600 -11.57092 56.4796 -51.2920 3.8535856595E+05 1.6019119
2014-Aug-10 22:40 * 320.14478 -11.39388 61.4676 -47.9262 3.8726459521E+05 1.5751464
2014-Aug-10 23:00 * 320.39779 -11.21910 65.9228 -44.4146 3.8913968741E+05 1.5503686
2014-Aug-10 23:20 * 320.64470 -11.04652 69.9510 -40.7901 3.9098628714E+05 1.5276752
2014-Aug-10 23:40 * 320.88523 -10.87606 73.6393 -37.0782 3.9280694876E+05 1.5071534
2014-Aug-11 00:00 * 321.11913 -10.70762 77.0589 -33.2990 3.9460432737E+05 1.4888843
2014-Aug-11 00:20 * 321.34622 -10.54111 80.2680 -29.4685 3.9638117263E+05 1.4729444
2014-Aug-11 00:40 * 321.56633 -10.37643 83.3148 -25.5999 3.9814032256E+05 1.4594044
2014-Aug-11 01:00 * 321.77933 -10.21348 86.2399 -21.7046 3.9988469638E+05 1.4483286
2014-Aug-11 01:20 * 321.98516 -10.05217 89.0782 -17.7925 4.0161728548E+05 1.4397727
2014-Aug-11 01:40 * 322.18376 -9.89240 91.8601 -13.8725 4.0334114249E+05 1.4337828
2014-Aug-11 02:00 * 322.37514 -9.73408 94.6134 -9.9533 4.0505936837E+05 1.4303932
2014-Aug-11 02:20 * 322.55931 -9.57710 97.3637 -6.0432 4.0677509775E+05 1.4296254
2014-Aug-11 02:40 * 322.73636 -9.42140 100.1355 -2.1509 4.0849148262E+05 1.4314867
2014-Aug-11 03:00 *r 322.90638 -9.26689 102.9529 1.7146 4.1021167460E+05 1.4359690
2014-Aug-11 03:20 Cm 323.06953 -9.11349 105.8402 5.5436 4.1193880624E+05 1.4430484
2014-Aug-11 03:40 Nm 323.22597 -8.96113 108.8228 9.3252 4.1367597128E+05 1.4526843
2014-Aug-11 04:00 Nm 323.37591 -8.80976 111.9271 13.0473 4.1542620445E+05 1.4648188
2014-Aug-11 04:20 Am 323.51960 -8.65931 115.1813 16.6961 4.1719246081E+05 1.4793769
2014-Aug-11 04:40 Am 323.65731 -8.50973 118.6160 20.2556 4.1897759507E+05 1.4962664
2014-Aug-11 05:00 m 323.78934 -8.36100 122.2637 23.7072 4.2078434105E+05 1.5153781
2014-Aug-11 05:20 m 323.91602 -8.21305 126.1591 27.0293 4.2261529150E+05 1.5365862
2014-Aug-11 05:40 m 324.03771 -8.06588 130.3381 30.1965 4.2447287862E+05 1.5597491
2014-Aug-11 06:00 m 324.15478 -7.91945 134.8368 33.1798 4.2635935539E+05 1.5847098
2014-Aug-11 06:20 m 324.26762 -7.77375 139.6884 35.9454 4.2827677805E+05 1.6112975
2014-Aug-11 06:40 m 324.37665 -7.62878 144.9199 38.4556 4.3022698985E+05 1.6393282
2014-Aug-11 07:00 m 324.48229 -7.48451 150.5465 40.6690 4.3221160624E+05 1.6686066
2014-Aug-11 07:20 m 324.58496 -7.34097 156.5650 42.5420 4.3423200186E+05 1.6989269
2014-Aug-11 07:40 m 324.68513 -7.19816 162.9470 44.0312 4.3628929920E+05 1.7300748
2014-Aug-11 08:00 m 324.78322 -7.05609 169.6341 45.0973 4.3838435932E+05 1.7618292
2014-Aug-11 08:20 m 324.87968 -6.91477 176.5371 45.7089 4.4051777459E+05 1.7939638
2014-Aug-11 08:40 t 324.97495 -6.77424 183.5425 45.8470 4.4268986360E+05 1.8262488
2014-Aug-11 09:00 m 325.06946 -6.63451 190.5242 45.5073 4.4490066829E+05 1.8584531
2014-Aug-11 09:20 m 325.16364 -6.49562 197.3598 44.7012 4.4714995330E+05 1.8903462
2014-Aug-11 09:40 m 325.25790 -6.35759 203.9456 43.4542 4.4943720765E+05 1.9216994
2014-Aug-11 10:00 m 325.35263 -6.22046 210.2061 41.8021 4.5176164858E+05 1.9522887
2014-Aug-11 10:20 m 325.44820 -6.08426 216.0969 39.7868 4.5412222762E+05 1.9818957
2014-Aug-11 10:40 m 325.54498 -5.94903 221.6020 37.4524 4.5651763883E+05 2.0103098
2014-Aug-11 11:00 m 325.64328 -5.81480 226.7277 34.8423 4.5894632906E+05 2.0373298
2014-Aug-11 11:20 m 325.74341 -5.68162 231.4957 31.9967 4.6140651011E+05 2.0627656
2014-Aug-11 11:40 m 325.84565 -5.54950 235.9373 28.9518 4.6389617279E+05 2.0864391
2014-Aug-11 12:00 Am 325.95025 -5.41849 240.0882 25.7399 4.6641310255E+05 2.1081863
2014-Aug-11 12:20 Nm 326.05742 -5.28862 243.9856 22.3888 4.6895489671E+05 2.1278579
2014-Aug-11 12:40 Nm 326.16734 -5.15992 247.6663 18.9226 4.7151898298E+05 2.1453206
2014-Aug-11 13:00 Cm 326.28017 -5.03241 251.1655 15.3623 4.7410263918E+05 2.1604581
2014-Aug-11 13:20 Cm 326.39602 -4.90613 254.5165 11.7261 4.7670301399E+05 2.1731715
2014-Aug-11 13:40 *m 326.51499 -4.78109 257.7505 8.0299 4.7931714843E+05 2.1833804
2014-Aug-11 14:00 *m 326.63712 -4.65732 260.8973 4.2879 4.8194199804E+05 2.1910228
2014-Aug-11 14:20 *m 326.76244 -4.53482 263.9852 0.5132 4.8457445549E+05 2.1960559
2014-Aug-11 14:40 *s 326.89093 -4.41362 267.0418 -3.2824 4.8721137347E+05 2.1984559
2014-Aug-11 15:00 * 327.02255 -4.29372 270.0947 -7.0872 4.8984958767E+05 2.1982182
2014-Aug-11 15:20 * 327.15724 -4.17513 273.1717 -10.8900 4.9248593968E+05 2.1953573
2014-Aug-11 15:40 * 327.29488 -4.05785 276.3018 -14.6792 4.9511729964E+05 2.1899062
2014-Aug-11 16:00 * 327.43535 -3.94188 279.5161 -18.4426 4.9774058861E+05 2.1819166
2014-Aug-11 16:20 * 327.57849 -3.82722 282.8482 -22.1671 5.0035280025E+05 2.1714578
2014-Aug-11 16:40 * 327.72413 -3.71386 286.3350 -25.8376 5.0295102195E+05 2.1586166
2014-Aug-11 17:00 * 327.87205 -3.60178 290.0182 -29.4371 5.0553245514E+05 2.1434961
2014-Aug-11 17:20 * 328.02205 -3.49099 293.9444 -32.9457 5.0809443467E+05 2.1262154
2014-Aug-11 17:40 * 328.17386 -3.38145 298.1658 -36.3396 5.1063444717E+05 2.1069083
2014-Aug-11 18:00 * 328.32723 -3.27316 302.7403 -39.5899 5.1315014830E+05 2.0857225
2014-Aug-11 18:20 * 328.48189 -3.16609 307.7299 -42.6624 5.1563937877E+05 2.0628185
2014-Aug-11 18:40 * 328.63755 -3.06021 313.1977 -45.5156 5.1810017910E+05 2.0383686
2014-Aug-11 19:00 * 328.79391 -2.95551 319.2009 -48.1005 5.2053080292E+05 2.0125556
2014-Aug-11 19:20 * 328.95066 -2.85196 325.7800 -50.3609 5.2292972894E+05 1.9855715
2014-Aug-11 19:40 * 329.10748 -2.74952 332.9430 -52.2354 5.2529567129E+05 1.9576166
2014-Aug-11 20:00 * 329.26406 -2.64818 340.6471 -53.6611 5.2762758841E+05 1.9288975
2014-Aug-11 20:20 * 329.42008 -2.54789 348.7843 -54.5815 5.2992469027E+05 1.8996265
2014-Aug-11 20:40 * 329.57521 -2.44863 357.1809 -54.9548 5.3218644394E+05 1.8700198
2014-Aug-11 21:00 * 329.72913 -2.35036 5.6172 -54.7618 5.3441257751E+05 1.8402958
2014-Aug-11 21:20 * 329.88154 -2.25306 13.8657 -54.0107 5.3660308227E+05 1.8106746
2014-Aug-11 21:40 * 330.03211 -2.15669 21.7323 -52.7345 5.3875821319E+05 1.7813754
2014-Aug-11 22:00 * 330.18056 -2.06121 29.0839 -50.9844 5.4087848762E+05 1.7526159
2014-Aug-11 22:20 * 330.32659 -1.96661 35.8551 -48.8208 5.4296468225E+05 1.7246105
2014-Aug-11 22:40 * 330.46991 -1.87284 42.0372 -46.3057 5.4501782836E+05 1.6975690
2014-Aug-11 23:00 * 330.61028 -1.77987 47.6606 -43.4969 5.4703920531E+05 1.6716947
2014-Aug-11 23:20 * 330.74743 -1.68768 52.7778 -40.4454 5.4903033225E+05 1.6471837
2014-Aug-11 23:40 * 330.88115 -1.59624 57.4504 -37.1950 5.5099295828E+05 1.6242230
2014-Aug-12 00:00 * 331.01120 -1.50551 61.7411 -33.7820 5.5292905080E+05 1.6029893
$$EOE
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Column meaning:
TIME
Prior to 1962, times are UT1. Dates thereafter are UTC. Any ‘b’ symbol in the 1st-column denotes a B.C. date. First-column blank (” “) denotes an A.D. date. Calendar dates prior to 1582-Oct-15 are in the Julian calendar system. Later calendar dates are in the Gregorian system.
Time tags refer to the same instant throughout the universe, regardless of where the observer is located.
The dynamical Coordinate Time scale is used internally. It is equivalent to the current IAU definition of “TDB”. Conversion between CT and the selected non-uniform UT output scale has not been determined for UTC times after the next July or January 1st. The last known leap-second is used over any future interval.
NOTE: “n.a.” in output means quantity “not available” at the print-time.
SOLAR PRESENCE (OBSERVING SITE)
Time tag is followed by a blank, then a solar-presence symbol:
‘*’ Daylight (refracted solar upper-limb on or above apparent horizon)
‘C’ Civil twilight/dawn
‘N’ Nautical twilight/dawn
‘A’ Astronomical twilight/dawn
‘ ‘ Night OR geocentric ephemeris
LUNAR PRESENCE WITH TARGET RISE/TRANSIT/SET MARKER (OBSERVING SITE)
The solar-presence symbol is immediately followed by another marker symbol:
‘m’ Refracted upper-limb of Moon on or above apparent horizon
‘ ‘ Refracted upper-limb of Moon below apparent horizon OR geocentric
‘r’ Rise (target body on or above cut-off RTS elevation)
‘t’ Transit (target body at or past local maximum RTS elevation)
‘s’ Set (target body on or below cut-off RTS elevation)
RTS MARKERS (TVH) Rise and set are with respect to the reference ellipsoid true visual horizon defined by the elevation cut-off angle. Horizon dip and yellow-light refraction (Earth only) are considered. Accuracy is < or = to twice the requested search step-size. R.A._(J2000.0)_DEC. = J2000.0 astrometric right ascension and declination of target center. Adjusted for light-time. Units: DEGREES Azi_(a-appr)_Elev = Airless apparent azimuth and elevation of target center. Adjusted for light-time, the gravitational deflection of light, stellar aberration, precession and nutation. Azimuth measured North(0) -> East(90) -> South(180) -> West(270) -> North (360). Elevation is with respect to plane perpendicular to local zenith direction. TOPOCENTRIC ONLY. Units: DEGREES
delta deldot = Range (“delta”) and range-rate (“delta-dot”) of the target center relative to the observer at the instant light seen by the observer at print-time would have left the target center (print-time minus down-leg light-time); the distance traveled by a light ray emanating from the center of the target and recorded by the observer at print-time. “deldot” is a projection of the velocity vector along this ray, the light-time-corrected line-of-sight from the coordinate center, and indicates relative motion. A positive “deldot” means the target center is moving away from the observer (coordinate center). A negative “deldot” means the target center is moving toward the observer. Units: KM and KM/S
SPACECRAFT TRAJECTORY
Trajectory name Start Stop
————————————————– ———– ———–
ice_s41 2014-Jan-01 2014-Dec-31
BACKGROUND: Launched 1978-Aug-12 15:12 UTC on a Delta 2914, the International Sun-Earth Explorer 3 was the third of a trio of spacecraft launched to study interplanetary space; Earth’s magnetosphere and its interaction with the solar wind. ISEE-1 and 2 were Earth-orbiters. ISEE-3 was the first spacecraft to orbit a libration point (Earth-Sun L1, about 1.5 million km from Earth) beginning 1978-Nov-20. The mission was managed by NASA/GSFC.
After completion of its primary mission, it was renamed International Cometary Explorer (ICE) and sent to study comet Giacobini-Zinner and comet Halley. Fifteen maneuvers and five lunar passes (the last on 1983-Dec-22, at an altitude of 119.4 km, not far from the Apollo 11 landing site on the surface) were used to maneuver it to the heliocentric escape orbit achieved 1983-Dec-22.
It was the first spacecraft to fly past a comet, being initially maneuvered to a point 26550 km behind comet Giacobini-Zinner on 1985-Jun-05 so as to sample the tail, then approached the nucleus to within 7862 km on 1985-Sep-11 with a relative velocity of 20.7 km/s, confirming for the first time theories that comets are ‘dirty snowballs’ of ice and rock. The spacecraft later flew between the Sun and comet Halley on 1986-Mar-28, 31 million km from the comet.
NASA headquarters approved an update to the ICE mission in 1991: a heliospheric mission consisting of investigations of coronal mass ejections in coordination with ground-based observations, continued cosmic ray studies, and special-period observations such as when ICE and Ulysses were on the same solar radial line. By May 1995, ICE was being operated with only a low duty cycle, with some support being provided by the Ulysses project for data analysis. Two years later, on May 5, 1997, NASA authorized termination of operations.
Twelve of its thirteen instruments were working and the spacecraft retained a 150 m/s delta-V fuel capacity.
At 20:49 UTC on September 18, 2008, the 70-meter Goldstone antenna DSS-14 locked onto the carrier signal of the ISEE-3/ICE spacecraft, still transmitting and relatively close to the position based on predictions from several years earlier. The remainder of the 3-hour track was then used to gather Doppler tracking data for future use.
When last contacted, the spacecraft was on a trajectory that will bring it close to Earth in August 2014.
Current transmitter hardware of the Deep Space Network no longer includes the equipment needed to transmit commands to ISEE-3 without some modification, but the spacecraft’s transmitter signal could still be detected and down-linked data understood.
PHYSICAL DATA:
Cylindrical: 1.7-m diameter x 1.6-m height
Mass : 390 kg (478 kg at launch)
Spin rate : 20 rpm
Solar power: 160 watts (cells cover body surface)
Two 3-meter booms carrier magnetometer and plasma wave sensors.
Four antennas span 91-meters for radio and plasma wave studies.
Computations by …
Solar System Dynamics Group, Horizons On-Line Ephemeris System
4800 Oak Grove Drive, Jet Propulsion Laboratory
Pasadena, CA 91109 USA
Information: http://ssd.jpl.nasa.gov/
Connect : telnet://ssd.jpl.nasa.gov:6775 (via browser)
telnet ssd.jpl.nasa.gov 6775 (via command-line)
Author : [email protected]
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