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Huygens Summary Timeline |
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This is a more-or-less arbitrary
collection of events during the Huygens mission that are of scientific and/or
engineering interest. Compiled by R. D. Lorenz drawing on the work of
many. |
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The official UTC
value of T0 is
2005-014T09:10:20.828 . |
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| T-T0 |
Altitude (km) |
Event |
Ref |
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| -16143 |
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Probe power-on |
1 |
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| -8396 |
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Probe support avionics power-on |
1 |
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| -348 |
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Arrival at interface altitude (1,270 km) |
3 |
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| -6.375 |
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S0 (deceleration falls below 10 m/s2) |
3 |
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| 0 |
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t0 (start of the descent sequence) |
1 |
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| 1.4 |
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Pilot Chute Inflates |
3 |
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| 2.5 |
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Back Cover Release, Deploy Main |
3 |
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| 4.9 |
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Main Parachute inflates |
3 |
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| 32.5 |
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Heat shield separation |
3 |
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| 45 |
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Transmitter ON |
1 |
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| 50 |
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GCMS inlet cap jettison |
1 |
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| 58 |
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GCMS outlet cap jettison |
1 |
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| 62 |
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HASI boom deployment (latest) |
1 |
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| 66 |
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DISR cover jettison |
1 |
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| 90 |
145 |
ACP inlet cap jettison |
1 |
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| 143.6 |
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Data Transmission Begins |
3 |
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| ~528 |
126 |
Spin Rate = 0, spin reverses |
9,5 |
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| 900 |
111 |
Main Chute Release/Stabilizer Deploy |
1 |
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| 903 |
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Stabilizer inflated |
3 |
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| 1050 |
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Anomalous HASI PWA data |
4 |
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| 1242 |
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Anomalous HASI PWA data |
4 |
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| 1249 |
90 |
Maximum Spin Rate = -9.56rpm |
9,5 |
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| 1440 |
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ACP Pump On.
SSP API data degraded |
5 |
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| ~1500 |
~76 |
Minimum in Zonal Wind Speed Profile |
13 |
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| ~1554 |
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GCMS Ion Source 5 Anomaly |
5,6 |
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| 1974 |
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Radar altimeter power-on |
3 |
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| ~2000 |
62 |
Peak in HASI RP Electron Density |
2 |
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| ~2700 |
45 |
Radar Altimeter B locks (false) on surface |
11 |
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| 3440 |
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ACP Pump off |
5 |
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| ~3450 |
36 |
Radar Altimeter A locks (false) on surface |
11 |
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| ~4650 |
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ACP Pump On. |
5 |
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| 5150 |
21 |
DISR detects faint cloud layer |
14 |
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| ~5200 |
20 |
Radar altimeter B locks correctly |
11 |
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| 5310 |
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ACP Pump Off |
5 |
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| ~6000 |
15 |
Radar Altimeter A locks correctly |
11 |
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| ~6685 |
11.5 |
SSP API-V begins to get pulses |
12 |
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| 6720 |
10.9 |
DISR detects faint cloud layer |
14 |
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| ~7500 |
7 |
Probe turns to move WNW |
8 |
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| ~8650 |
1 |
Probe begins to move to SW |
8 |
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| 8745 |
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DISR surface lamp on |
1 |
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| 8842 |
0.14 |
Radar altimeters lost lock |
11 |
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| 8850 |
0.1 |
SSP Echo Sounder Detects Surface |
10 |
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| 8870 |
0 |
Surface impact |
1 |
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| ~8874 |
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Dust cloud dies away |
7 |
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| ~8874-8879 |
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Bouncing/Rocking motion of probe dies away |
7 |
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| 8887 |
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HASI temperatures begin slow increase |
5 |
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| 9052 |
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HASI Temperatures begin fluctuating |
5 |
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| 9103 |
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SSP API-V Pulses resume |
5 |
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| 9532 |
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HASI Temperatures drop ~0.2K |
5 |
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| 9550 |
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Discontinuity in HASI PWA Permittivity Data |
2 |
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| 10125 |
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SSP API-V Pulses cease |
5 |
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| 10128 |
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HASI Temperatures jump ~0.15K |
5 |
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| ~10400 |
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GCMS C2H6 level rises |
6 |
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| 10423 |
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Possible Dewdrop detected by DISR Image 897 |
5,8 |
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| 10787 |
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Last HASI Temperature |
5 |
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| ~11000 |
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GCMS CO2 and C2H2 levels rising |
6 |
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| 13203 |
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End of Cassini–probe link |
1 |
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| 16031 |
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Probe support avionics power-off |
1 |
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| 20559 |
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Last signal detection by Earth-based radio |
1 |
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| ~20700 |
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Estimated Battery Depletion ~T0+5.5-6hrs |
11 |
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Ref |
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1 |
Lebreton et al., Nature 438, 2005, 758-764 |
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2 |
Grard et al., PSS 54, 2006, 1124-1136 |
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3 |
Kazeminejad et al., PSS 55, 2007, 1845-1876 |
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4 |
Hamelin et al., PSS 55, 2007, 1964-1977 |
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5 |
Lorenz Analysis of PDS archive -unpublished |
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6 |
Niemann et al., JGR, 115, E12006, 2010 |
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7 |
Schroeder et al., PSS 73, 2012, 327-340 |
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8 |
Karkoschka et al., PSS 55, 2007, 1896-1935 |
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9 |
Sarlette et al., COMPARISON OF THE HUYGENS MISSION AND THE SM2 TEST FLIGHT |
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FOR HUYGENS
ATTITUDE RECONSTRUCTION, International Planetary Probe Workshop, |
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10 |
Zarnecki et al., Nature 438, 2005, 792-795 |
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11 |
Couzin, Huygens Mission
Post Flight Engineering Analysis, |
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12 |
Leese et al., PPS 70, 2012. 28-45 |
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13 |
Bird et al., Nature 438, 2005, 800-802 |
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14 |
Karkoschka et al., Icarus 199, 2009. 442-448 |
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