Cassini Activity Request (CAR) Form
Observation Name:
Titan EUV-FUV Imaging
Requesting Instrument:
UVIS
Objective: (both measurement and scientific objectives)
The objective is to obtain spatially-resolved high signal/noise images of Titan with the UVIS
EUV and FUV spectrometers. This data will be used to look for latitudinal gradients in
hydrocarbons and nitriles. Spectra of aerosols at a variety of phase angles will help constrain
aerosol size distribution.
Description of Activity:
Orientation and pointing:
Point the center of the FOV to the illuminated part of Titan. The optimal orientation will depend
on the phase angle. Possibilities include (1) slit aligned parallel to the equator to capture centerto-limb variations over a narrow latitude band, (2) slit aligned perpendicular to the equator to
allow the atmosphere to rotate under the slit to build a more-or-less square image near the subspacecraft longitude, or (3) slit aligned parallel to the limb to capture a range of latitudes near the
limb. The slit will either be fixed pointing at a specific longitude relative to the sub-spacecraft
longitude to let the atmosphere rotate under the slit, or scanned at a rate of 4 micro-radians per
second perpendicular to the slit direction (i.e. around the spacecraft Z axis) to build up a twodimensional image.
Turn on EUV and FUV using the narrow slits. Begin 250-second integrations lasting N hours
where N is to be determined by how much time is available or by how long it takes to build up an
image of the desired size. At a scan rate of 4 micro-radians per second it takes 2500 seconds to
scan 10 mrad. A square image 64 milli-radians long in the direction perpendicular to the slit
takes 4.4 hours. The UVIS internal windowing and binning will preserve full spatial/spectral
resolution. The total number of pixels per integration is 2*1024*64= 131072. The data rate
with SQRT9 compression is 9*131072/250s = 4.72 Kbit/s.
Activity Time Period: (window when the activity can take place)
1) Titan Distance 50,000 - 150,000 km
Start date/time
End date/time
2004
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
NOV
JAN
FEB
FEB
MAR
MAR
APR
APR
AUG
AUG
SEP
SEP
OCT
OCT
DEC
DEC
JAN
JAN
FEB
MAR
MAR
APR
APR
MAY
MAY
JUL
JUL
JUL
JUL
SEP
SEP
SEP
SEP
OCT
OCT
27
14
15
15
31
31
16
16
22
22
07
07
27
28
26
26
15
15
27
18
19
30
30
20
20
02
02
21
22
07
07
23
23
09
09
06:39:57.22
02:42:16.73
00:00:57.17
10:19:40.81
12:44:11.34
22:48:34.60
11:59:03.46
22:00:32.19
01:53:15.28
11:54:41.07
01:05:28.34
11:03:42.89
20:59:51.40
07:13:59.63
11:16:47.37
21:29:55.74
04:43:56.16
15:02:31.00
01:08:01.56
16:44:41.24
03:01:50.78
13:39:16.38
23:54:30.84
04:57:10.31
15:13:37.48
01:57:23.41
12:13:37.13
17:12:02.60
03:24:21.31
12:56:01.60
23:05:52.99
11:32:29.09
21:43:06.64
10:01:39.17
20:12:02.66
2004
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
NOV
JAN
FEB
FEB
MAR
APR
APR
APR
AUG
AUG
SEP
SEP
OCT
OCT
DEC
DEC
JAN
JAN
FEB
MAR
MAR
APR
MAY
MAY
MAY
JUL
JUL
JUL
JUL
SEP
SEP
SEP
SEP
OCT
OCT
27
14
15
15
31
01
16
17
22
22
07
07
28
28
26
27
15
15
27
18
19
30
01
20
20
02
02
21
22
07
08
23
24
09
10
Duration
11:38:26.85
07:41:07.54
04:59:23.68
15:08:27.24
17:40:15.31
03:45:03.97
16:53:29.17
02:55:24.73
06:47:40.12
16:49:32.57
05:59:01.65
15:57:53.25
02:00:40.87
12:14:06.40
16:22:20.28
02:35:23.06
09:46:56.63
20:04:52.23
06:08:05.98
21:47:01.32
08:03:33.47
18:40:22.27
04:56:11.76
09:59:09.66
20:15:01.25
06:58:57.59
17:15:48.08
22:11:57.13
08:23:46.93
17:54:47.64
04:04:21.85
16:31:46.91
02:42:08.44
15:00:56.55
01:11:12.27
4.97
4.98
4.97
4.81
4.93
4.94
4.91
4.91
4.91
4.91
4.89
4.90
5.01
5.00
5.09
5.09
5.05
5.04
5.00
5.04
5.03
5.02
5.03
5.03
5.02
5.03
5.04
5.00
4.99
4.98
4.97
4.99
4.98
4.99
4.99
2006
2006
2006
2006
2006
2006
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2008
OCT
OCT
DEC
DEC
DEC
DEC
JAN
JAN
JAN
JAN
FEB
FEB
MAR
MAR
MAR
MAR
APR
APR
APR
APR
MAY
MAY
MAY
MAY
JUN
JUN
JUN
JUL
JUL
AUG
AUG
OCT
OCT
NOV
NOV
DEC
DEC
DEC
DEC
JAN
25
25
12
12
28
28
13
13
28
29
21
22
09
10
25
26
10
11
26
27
12
12
28
28
13
13
29
18
19
30
31
01
02
18
19
04
05
20
21
05
08:30:10.47
18:39:48.28
04:11:26.17
14:24:13.98
02:35:57.59
12:47:15.99
01:09:15.74
11:20:50.88
23:46:12.75
09:58:25.05
20:04:37.88
05:46:53.11
18:41:43.21
04:23:25.27
17:16:19.75
02:57:39.96
15:50:45.51
01:31:44.80
14:25:00.46
00:05:42.53
12:59:48.33
22:40:16.58
11:41:39.96
21:21:53.87
10:34:07.44
20:14:23.12
19:27:48.92
17:35:44.88
03:13:06.48
23:21:44.63
09:00:16.85
21:40:24.72
07:12:58.90
17:43:36.12
03:17:05.29
17:02:07.61
02:33:53.21
15:51:45.00
01:23:25.20
14:23:01.82
2006
2006
2006
2006
2006
2006
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2007
2008
OCT
OCT
DEC
DEC
DEC
DEC
JAN
JAN
JAN
JAN
FEB
FEB
MAR
MAR
MAR
MAR
APR
APR
APR
APR
MAY
MAY
MAY
MAY
JUN
JUN
JUN
JUL
JUL
AUG
AUG
OCT
OCT
NOV
NOV
DEC
DEC
DEC
DEC
JAN
25
25
12
12
28
28
13
13
29
29
22
22
09
10
25
26
10
11
26
27
12
13
28
29
13
14
30
18
19
31
31
02
02
18
19
04
05
20
21
05
13:29:14.61
23:38:52.14
09:12:12.65
19:24:52.83
07:36:05.43
17:47:25.10
06:09:37.22
16:21:20.93
04:47:19.94
14:59:31.46
00:50:38.29
10:32:46.13
23:27:18.54
09:08:54.25
22:01:33.89
07:42:50.35
20:35:36.61
06:16:38.43
19:09:31.29
04:50:22.88
17:44:01.37
03:24:46.99
16:25:52.04
02:06:35.33
12:41:01.35
00:58:47.15
00:11:09.31
22:18:22.60
07:55:14.09
04:05:00.92
13:44:02.93
02:20:20.55
11:53:29.24
22:24:04.71
07:58:09.64
21:41:55.72
07:14:09.13
20:31:33.89
06:03:40.72
19:03:45.36
4.98
4.98
5.01
5.01
5.00
5.00
5.01
5.01
5.02
5.02
4.77
4.76
4.76
4.76
4.75
4.75
4.75
4.75
4.74
4.74
4.74
4.74
4.74
4.74
2.11
4.74
4.72
4.71
4.70
4.72
4.73
4.67
4.68
4.67
4.68
4.66
4.67
4.66
4.67
4.68
2008
2008
2008
2008
2008
2008
2008
2008
2008
2008
2008
JAN
FEB
FEB
MAR
MAR
MAY
MAY
MAY
MAY
JUL
JUL
05
22
22
25
25
12
12
28
28
30
31
23:56:13.22
10:35:30.73
20:05:03.12
07:31:24.67
17:00:35.41
03:05:08.58
12:35:36.75
01:27:44.54
10:59:03.63
19:10:09.10
04:46:11.60
2008
2008
2008
2008
2008
2008
2008
2008
2008
2008
2008
JAN
FEB
FEB
MAR
MAR
MAY
MAY
MAY
MAY
JUL
JUL
06
22
23
25
25
12
12
28
28
30
31
Activity Duration:
Depends on the constraints, usually between 30 min. and 10 hr.
System Requirements:
pointing
+- 1 mrad
power
data volume
Variable
Data rate times time, typically between 9 and 180 Mbit.
data rate
4.72 Kbit/s
data mode
real-time commanding
04:37:22.70
15:14:38.39
00:44:30.93
12:10:32.98
21:39:59.05
07:45:05.58
17:15:44.07
06:08:16.84
15:39:41.52
23:53:51.41
09:29:48.54
4.69
4.65
4.66
4.65
4.66
4.67
4.67
4.68
4.68
4.73
4.73
Dependence on other instrument activities: (e.g. support imaging required)
Ridealong Activities:
Criticality: (how important is this activity to your instrument and why)
Special Requirements:
Notes on Instrument Configuration:
(details about the instrument configuration that you thought about when you designed the
activity and you want to document)
ECR or Flight Rule Reference: