HDAC Instrument – Cassini/Huygens Mission
HDAC: 2004
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status 2004:
- ~450 data sets in Jun. 2004
- ~2700 data sets in Jan. 2005
- HDAC run in photometer mode most of the time,
slow sensitivity decrese,
- 9 modulation measurements, switching
filaments
- Important observations in 2004:
LISM modulation, switching filaments
Phoebe, Titan, Saturn, …
“Systemscans”
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status:
Radiometry
- Small sensitivity changes over the whole year 2003/4
- Hot Model fits data
- Sensitivity is about 50 c/s/R
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status:
Radiometry
- Analysed data from IPHSURVEY sequences
- Looking for data, which are constant within a sequence
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC absolute sensitivity:
HDAC sensitivity 2002 (no break-ins)
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC absolute sensitivity:
absolute sensitivity stabilized ... ~ 60 counts/sec/R
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status:
Radiometry
- Analysed data from IPHSURVEY sequences
- Data, which are constant within the sequence
- Analysed the variance / mean value – relation
- n … number of incoming photons
- m … measured value
- µ … “Sensitivity”
 m =    n
2
2
2
2
2
2
 M =   m –  m   =     n –  n   =    N
2
2
2
M
 
--------= ----------------N- = 
 m
   n
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status:
Radiometry
-Analysed the variance / mean value – relation
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status:
Radiometry
-Analysed the variance / mean value – relation
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status 2003:
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status 2004:
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status 2004:
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status:
Radiometry
- HDAC Sensitivity from FUV data (IPHSURVEY)
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Status:
Radiometry (see: HK_EVAL_NEW.PRO)
-Analysed the variance / mean value – relation
- Decrease of variance / mean value of 75% every year
- Overall HotModel factor
2003 – 63
2004 – 53
-Additional model inputs from sun exitation changes
- Open problems:
-Absolute sensitivity change in comparison to FUV
-(FUV, absolute spectral response)
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Modulation mode:
1. H and D-Cell Modulation lower than expected
2. Shape of the modulation curve is different
Derived a new Power-Tau-relation from all existing
measurements
Results:
• Describes all measurements
• Stable situation for the last 3 years
Possible reasons:
• Loss of Hydrogen and/or change of
dissociation rate
• Filament or wall dependent
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation analysis:
Results:
no differences using the filaments 2 instead of
filaments 1
The additional signal by switching on the D cell is
still there
Decided to switch back to filaments 1
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
2004-030T01:54:56.0
192.307 -79.1874
-2.08658
8.57658 -0.0508378
2004-059T01:51:32.0
37.0632
76.4367
-2.18278
8.59764 -0.0500043
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation analysis:
7 * HDAC conditioning in 2004
2004-114T02:51:30.49500
2004-136T19:00:36.71475
2004-138T11:24:36.76589
2004-140T18:47:42.46509
2004-157T17:46:41.90646
2004-184T12:22:41.81400
2004-318T08:25:36.37405
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation:
-New program for HDAC
modulation analysis
- Integrates HotModel &
Spice
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation:
-New program for HDAC
modulation analysis
- Integrates HotModel &
Spice
Next steps:
- Optimizing parameters
- Accuracy estimation
Estm = 0.0379 A
LISM = 0.0391 A
Diff  1 mA
(1215.664 A, 1215.34 A)
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation analysis:
Modulation analysis only
works for H-modulation
Problem: Influence of
the D-Cell
(radiation of D-filament)
Between 20% & 30%
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation analysis:
Modulation analysis only
works for H-modulation
Problem: Influence of
the D-Cell
(radiation of D-filament)
Between 20% & 30%
Sometimes there is no
additional Signal
Result: See Result.xls
UVIS Science Teammeeting
05 Jan. 2005
Mod.-Messung
Datumstring
HDAC
Instrument – Cassini/Huygens Mission
Zunahme Verhältnis
Doppler Vel
3
2000-262T06:55:25.84498
0,2939795
-2,0424494
4
2000-345T21:50:01.78943
0,10101432
-10,749073
5
2000-365T22:04:00.81714
0,11943983
2,5946312
6
2001-007T13:04:01.25491
0,067791708
11,217736
7
2001-093T06:35:30.99943
0,23235177
-3,4794599
8
2001-148T07:51:30.64938
0,28342512
-5,6660298
9
2001-191T14:21:30.44971
0,32140973
2,839637
10
2001-299T18:01:29.36067
0,27091792
0,95167742
11
2001-317T01:51:30.89056
0,21967007
1,5689569
12
2002-034T21:51:30.75724
0,23379506
9,2079015
13
2002-098T01:51:30.01271
0,20451419
9,4931434
14
2002-136T01:51:29.65465
0,19914286
10,512993
15
2002-202T05:51:30.62946
0,17702614
15,679651
16
2002-283T10:12:40.76701
0,2442347
9,222591
17
2002-283T11:55:34.72367
0,2494297
-7,4671483
18
2002-325T14:51:30.90231
0,18355468
16,913488
19
2002-339T11:51:29.35362
0,23879139
2,1504466
20
2003-199T09:51:31.19813
0,33065543
-1,6043787
21
2003-267T13:10:50.73707
0,3305265
1,9372256
22
2003-292T18:21:30.50392
0,38404149
-15,738391
23
2004-114T02:51:30.56295
0,26363096
-20,647935
24
2004-136T19:00:36.80425
0,27577567
-0,88465424
25
2004-138T11:24:36.85699
0,25488845
-0,88520286
26
2004-140T18:47:42.55839
0,25823626
-0,91605811
27
2004-157T17:46:42.01587
0,32622793
-11,140243
28
2004-184T12:22:41.94886
0,12501162
1,7791853
2004-318T08:25:36.55341
0,004120597
05 Jan.-25,24598
2005
29
UVIS Science Teammeeting
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation:
Korrekturversuch
[1d2, 2d2, 5d2, 5d2,
9d2, 22d2, 26d2, 33d2]
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation:
Korrekturversuch
[1d2, 2d2, 5d2, 5d2,
9d2, 22d2, 26d2, 33d2]
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation:
Temperaturrekonstruktion
Funktioniert oft nicht!
[1d2, 2d2, 5d2, 5d2,
9d2, 22d2, 26d2, 33d2]
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC modulation analysis:
HDAC modulation measurements during the other
Titan observations until end of mission
Need to compare the HDAC data with FUV data
(HDAC's red tail sensitivity)
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Titan:
2005-12-26T18
Problem:
New tour kernel
Old pointing
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Titan:
2006-10-25T15
2006-12-12T11
2006-12-28T10
2007-01-29T07
2007-08-31T06
2008-05-28T08
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Titan Modulation Data
2004-184T
2005-090T08
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Titan
Limb Measurements
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Titan
Off-Axis Response
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Titan
Limb Scan
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Titan
Limb Scan
Ergebnis
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Data Analysis:
- Phoebe
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Data Analysis:
- Phoebe
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
Data Analysis:
- Phoebe
- FUV-Data
HDAC spectral sensitivity
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Events:
TITAN
Dist = 110.000 km
Phase Angle = 1°
MV  26 kc
MV  450 R (?)
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Events:
SATURN
Dist = 324.937 km
Phase Angle =9.3°
MW  50 kc
MW  900 R (?)
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Events:
SATURN
System Scan
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Open Problems for 2005:
-Absolute sensitivity and comparison to FUV
- FUV Data handling (more or less solved)
- Applying sensitivity from Bill
- Long time investigation of HDAC - Sensitivity
-Saturn – Orbit System Scan
-Saturn – Limb(?) san
-Find out Orbit-situation
-Titan Limb-Scan
-Titan Modulation
UVIS Science Teammeeting
05 Jan. 2005
HDAC Instrument – Cassini/Huygens Mission
HDAC Open Problems for 2005:
SATURN
-Absolute sensitivity and comparison to FUV
- FUV Data handling (more or less solved)
- Applying sensitivity from Bill
- Long time investigation of HDAC - Sensitivity
-Saturn – Orbit System Scan
-Find out Orbit-situation
-Titan Limb-Scan
-Titan Modulation
UVIS Science Teammeeting
05 Jan. 2005