Huygens Summary Timeline
		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.
		The  official UTC value of T0  is 2005-014T09:10:20.828 .
T-T0	Altitude (km)	Event	Ref
-16143		Probe power-on	1
-8396		Probe support avionics power-on	1
-348		Arrival at interface altitude (1,270 km)	3
-6.375		S0 (deceleration falls below 10 m/s2)	3
0		t0 (start of the descent sequence)	1
1.4		Pilot Chute Inflates	3
2.5		Back Cover Release, Deploy Main	3
4.9		Main Parachute inflates	3
32.5		Heat shield separation	3
45		Transmitter ON	1
50		GCMS inlet cap jettison	1
58		GCMS outlet cap jettison	1
62		HASI boom deployment (latest)	1
66		DISR cover jettison	1
90	145	ACP inlet cap jettison	1
143.6		Data Transmission Begins	3
~528	126	Spin Rate = 0, spin reverses	9,5
900	111	Main Chute Release/Stabilizer Deploy	1
903		Stabilizer inflated	3
1050		Anomalous HASI PWA data	4
1242		Anomalous HASI PWA data	4
1249	90	Maximum Spin Rate = -9.56rpm	9,5
1440		ACP Pump On.   SSP API data degraded	5
~1500	~76	Minimum in Zonal Wind Speed Profile	13
~1554		GCMS Ion Source 5 Anomaly	5,6
1974		Radar altimeter power-on	3
~2000	62	Peak in HASI RP Electron Density	2
~2700	45	Radar Altimeter B locks (false) on surface	11
3440		ACP Pump off	5
~3450	36	Radar Altimeter A locks (false) on surface	11
~4650		ACP Pump On.	5
5150	21	DISR detects faint cloud layer	14
~5200	20	Radar altimeter B locks correctly	11
5310		ACP Pump Off	5
~6000	15	Radar Altimeter A locks correctly	11
~6685	11.5	SSP API-V begins to get pulses	12
6720	10.9	DISR detects faint cloud layer	14
~7500	7	Probe turns to move WNW	8
~8650	1	Probe begins to move to SW	8
8745		DISR surface lamp on	1
8842	0.14	Radar altimeters lost lock	11
8850	0.1	SSP Echo Sounder Detects Surface	10
8870	0	Surface impact	1
~8874		Dust cloud dies away	7
~8874-8879		Bouncing/Rocking motion of probe dies away	7
8887		HASI temperatures begin slow increase	5
9052		HASI Temperatures begin fluctuating	5
9103		SSP API-V Pulses resume	5
9532		HASI Temperatures drop ~0.2K	5
9550		Discontinuity in HASI PWA Permittivity Data	2
10125		SSP API-V Pulses cease	5
10128		HASI Temperatures jump ~0.15K	5
~10400		GCMS C2H6 level rises	6
10423		Possible Dewdrop detected by DISR Image 897	5,8
10787		Last HASI Temperature	5
~11000		GCMS CO2 and C2H2 levels rising	6
13203		End of Cassini–probe link	1
16031		Probe support avionics power-off	1
20559		Last signal detection by Earth-based radio	1
~20700		Estimated Battery Depletion  ~T0+5.5-6hrs	11
	Ref
	1	Lebreton et al., Nature 438, 2005, 758-764
	2	Grard et al., PSS 54, 2006, 1124-1136
	3	Kazeminejad et al., PSS 55, 2007, 1845-1876
	4	Hamelin et al., PSS 55, 2007, 1964-1977
	5	Lorenz Analysis of PDS archive
	6	Niemann et al 2011
	7	Schroeder et al., PSS 73, 2012, 327-340
	8	Karkoschka et al., PSS 55, 2007, 1896-1935
	9	Sarlette, 2005
	10	Zarnecki et al., Nature 438, 2005, 792-795
	11	Couzin 2005
	12	Leese et al., PPS 70, 2012. 28-45
	13	Bird et al., Nature 438, 2005, 800-802
	14	Karkoschka et al., Icarus 199, 2009. 442-448