DAWN-FC
DAWN - Framing Camera
Dawn FC DC065 Report
DA-FC-MPAE-RP-304
Issue: 1
Revision: a
5 December 2013
Prepared by:
P. Gutierrez-Marques
J. Ripken
Approval Sheet
Prepared by: P. Gutierrez-Marques (signature/date)
Approved by: A. Nathues (signature/date)
Document Change Record
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Iss./Rev. Date Pages affected Description
Draft 22/03/2011 All first version
1/- 29/03/2011 Most
1/a 05/04/2011 10 Added two streaks to the table
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Distribution Record
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Holder Issue/Revision
D 1 2
Configuration File
(Doc)
MPS
IB Buettner C
UC Christensen
PGM Gutierrez-M. C C
TM Maue C C
AN Nathues A A
MLR Richards C C
SSc Schroeder C C
HSI Sierks C C
ISZ Szemerey
DLR Carsenty
DLR Jaumann
DLR Michaelis
DLR Mottola C
IDA Fiethe
IDA Michalik
JPL Raymond C
JPL Polanskey C
UCLA Joy C
Legend:
A - Approval
C - Copy
U - Updated Pages
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Table of contents
1 General aspects................................................ 1
1.1 Scope....................................................... 1
1.2 Introduction................................................ 1
2 Description of the activities.................................. 1
3 Operations summary............................................. 1
4 Health status assessment....................................... 1
5 Image analysis................................................. 1
5.1 Exposure times.............................................. 1
5.2 Dark current................................................ 1
5.3 Extra charge................................................ 3
5.4 Image streaks............................................... 3
6 Conclusions.................................................... 3
List of Figures
Figure 1: Bulk dark current for DC048. Left: FC1, right: FC2. The dotted line is the bulk dark current model derived from ICO observations..................................................... 2
Figure 2: FC1 warm pixel histograms for DC053 and DC065. 2
Figure 3: FC2 warm pixel histograms for DC053 and DC065. 2
Figure 4: FC1 extra charge levels in DC065............................ 3
Figure 5: FC1 extra charge levels in DC053............................ 3
List of Tables
No table of figures entries found.
This document contains the operations reports as well as the results of the analysis of the data acquired by both Framing Cameras during the DC065 operational slot. The scope of the activities was exclusively engineering, so no associated science report will be released.
This report is structured in several parts.
Section 2 describes the conducted operations, including the different activities and a brief description of each.
Section 3 includes the activity log of the operational slot.
Section 4 reports on the general health status of the cameras.
Section 5 explains the evolution of the sensors since launch and analysis their change in performance.
The conclusions are covered in section 6.
=========================================================================== no. document name document number, Iss./Rev. AD1 DC065 Walkthrough DC065_Walkthrough_r4.ppt AD2 FC Semi-Annual Checkout Sequence DA-FC-MPAE-TN-076, 2/- ===========================================================================
=========================================================================== no. document name document number, Iss./Rev. RD1 Dawn FC DC048 Report DA-FC-MPAE-RP-304, 1/a RD2 Dawn FC DC041 Report DA-FC-MPAE-RP-295, 1/- RD3 Dawn FC DC038 Report DA-FC-MPAE-RP-290, 1/- RD4 Dawn FC DC034 Report DA-FC-MPAE-RP-285, 1/- RD5 DC018 Report DA-FC-MPAE-RP-286, 1/- RD6 DC014 Report DA-FC-MPAE-RP-287, 1/- RD7 Framing Camera ICO Report DA-FC-MPAE-RP-268, D/c ===========================================================================
The operations of the Framing Cameras within the frame of DC065 were planned to be conducted between November 11th 2013 (DOY 319) and December 3rd (DOY 337). There were two activities:
The background of this activity is the need for the mechanisms on the cameras to be operated twice a year for maintenance. FC1 was due for this maintenance because its last operation had been during DC052 in December 2012. The details of the activity are described in AD2. A total of 65 images were acquired during this activity.
The scope of the activities for FC2 was the same as for FC1. Under normal circumstances FC2 should have undergone a pointed checkout in order to follow the sensitivity of the camera over the cruise phase. However in order to save hydrazine this check was delayed to a later point in time and a non-pointed checkout was performed instead.
Given the routine nature of this operation and the experience accumulated by the team in the recent years it was acceptable to run this operation unsupervised. The success of the test was confirmed by the Snitch report and the analysis of the images.
Snitch v2.03
This report covers the following sessions
e:/data/flight/working_archive/fc1/14_vcc/13338_0
Snitch report for session e:/data/flight/working_archive/fc1/14_vcc/13338_0
Searching for third party reports in folder \.
Data integrity report
=====================
Files fc1_72pb_133381030_0600_0.dat,fc1_76pb_133381030_0600_0.dat do not
contain any gaps
Command execution report
========================
62 UDP commands were executed
* UDP executions
AutoStart was executed 1 times
CALAcquireSeveralImages was executed 9 times
DLAcquireImage was executed 38 times
FCPrepPowerDown was executed 1 times
FEE_CALPara was executed 2 times
MCUCloseCD was executed 1 times
MCUFWInit was executed 1 times
MCUGotoFilterX was executed 5 times
MCUOpenCD was executed 1 times
PCUSwitchEnableAndVerify was executed 2 times
PCUSwitchPowerAndVerify was executed 1 times
* UDP execution collisions
DLAcquireImage started at 439301377, 1 seconds before DLAcquireImage could
finish at 439301378
DLAcquireImage started at 439303537, 2 seconds before DLAcquireImage could
finish at 439303539
The camera received 61 commands for a total of 61
with 0 commands errors for a total of 0
Image performance report
========================
Of the 65 images downloaded in this session
* OpNav selection
0 images were selected as OpNav
* Image acquisition mode
10 images were acquired in DARK mode
28 images were acquired in FLATFIELD mode
20 images were acquired in NORMAL mode
3 images were acquired in SERIAL mode
3 images were acquired in STORAGE mode
1 images were acquired in TEST_CH mode
* Exposure time
32 images were acquired with an exposure of 0.000 <millisecond>
2 images were acquired with an exposure of 140000.000 <millisecond>
6 images were acquired with an exposure of 15000.000 <millisecond>
2 images were acquired with an exposure of 160000.000 <millisecond>
2 images were acquired with an exposure of 230000.000 <millisecond>
9 images were acquired with an exposure of 300000.000 <millisecond>
2 images were acquired with an exposure of 35000.000 <millisecond>
2 images were acquired with an exposure of 37000.000 <millisecond>
2 images were acquired with an exposure of 40000.000 <millisecond>
4 images were acquired with an exposure of 800.000 <millisecond>
2 images were acquired with an exposure of 85000.000 <millisecond>
* Filter number
51 images were acquired in filter number "1"
2 images were acquired in filter number "2"
2 images were acquired in filter number "3"
2 images were acquired in filter number "4"
2 images were acquired in filter number "5"
2 images were acquired in filter number "6"
2 images were acquired in filter number "7"
2 images were acquired in filter number "8"
* Image compression algorithm
46 images were compressed with "Set Partitioning in Hierarchical Trees (SPIHT
LIFT)" algorithm
19 images were compressed with "Set Partitioning in Hierarchical Trees (SPIHT
TAP)" algorithm
* Image compression type
27 images were compressed "LOSSLESS"
38 images were compressed "LOSSY"
* Image compression ratio
Compression ratio varied between 0 and 2 with an average of 0.0307692
Image quality report
====================
* Saturated pixels
12 images with 0 saturated pixels
1 images with 10 saturated pixels
1 images with 14 saturated pixels
1 images with 2 saturated pixels
4 images with 4 saturated pixels
1 images with 6 saturated pixels
* Brightest pixel value
The brightest pixel in the images varied between 8430 and 16383, with an
average of 13019.4
HK report
=========
* Time span
This session covers the period between 2013-12-02T22:09:25 and 2013-12-
03T02:01:09
(SCLK between 439294165 and 439308069)
* Consumables
The filter wheel performed 12 moves for an accumulated total of 294
The front door performed 2 moves for an accumulated total of 32
* Image processing
(All totals since last power up)
65 images were acquired for a total of 65
allocation errors ocurred for an accumulated total of 0
0 image processing errors ocurred for an accumulated total of 0
* Temperatures
The temperature of the CCD varied between -62.4222 and -48.6958 C
The temperature of the CH varied between -130.6 and -15.8875 C
* Memory consumption
The session started with 62177 blocks of free image memory, varied between
58375 and 62177 and finished with 62177 blocks free
* System flags
The camera was booted nominally
* Door position
The session started with the door encoder value at 35 and finished with 35
UDP HK report
=============
* Time span
This session covers the period between 2013-12-02T22:11:56 and 2013-12-
03T02:01:11
(SCLK between 439294316 and 439308071)
* File handles
The number of free handles changed from 1389 to 1387 in the course of the
session
During the session it reached a maximum of 1389 and a minimum of 1358
* Processing queues
OpNav processing queue changed from 0 to 0 in the course of the session,
with a maximum of 23 and a minimum of 0
Science1 processing queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science2 processing queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science3 processing queue changed from 0 to 0 in the course of the session,
with a maximum of 23 and a minimum of 0
* Downlink queues
OpNav downlink queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science1 downlink queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science2 downlink queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science3 downlink queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
* Thermal control
The camera head heater had an average duty cycle of 41.6815, with a maximum
of 76.9004 and a minimum of 0
The baffle heater had an average duty cycle of -2.97056, with a maximum of
25.5059 and a minimum of -31.1751
Event report
============
* Warnings and errors
4 notifications of type 2008 -> Error Log: The log is corrupted HANDLE =
1 notifications of type 2088 -> MCU: Door was commanded to close, but encoder
says, it's closed.
3 notifications of type 2240 -> Downlink Manager: Some queues where reset =
* HK Monitor alarms (experimental, handle with care)
37 alarms found !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Snitch v2.03
This report covers the following sessions
e:/data/flight/working_archive/fc2/14_vcc/13322_0
Snitch report for session e:/data/flight/working_archive/fc2/14_vcc/13322_0
Searching for third party reports in folder \.
Data integrity report
=====================
Files fc2_82pb_133221040_0930_0.dat,fc2_86pb_133221040_0930_0.dat do not
contain any gaps
Command execution report
========================
62 UDP commands were executed
* UDP executions
AutoStart was executed 1 times
CALAcquireSeveralImages was executed 9 times
DLAcquireImage was executed 38 times
FCPrepPowerDown was executed 1 times
FEE_CALPara was executed 2 times
MCUCloseCD was executed 1 times
MCUFWInit was executed 1 times
MCUGotoFilterX was executed 5 times
MCUOpenCD was executed 1 times
PCUSwitchEnableAndVerify was executed 2 times
PCUSwitchPowerAndVerify was executed 1 times
* UDP execution collisions
DLAcquireImage started at 437845099, 2 seconds before DLAcquireImage could
finish at 437845101
The camera received 61 commands for a total of 61 with 0 commands errors
for a total of 0
Image performance report
========================
Of the 65 images downloaded in this session
* OpNav selection
0 images were selected as OpNav
* Image acquisition mode
10 images were acquired in DARK mode
28 images were acquired in FLATFIELD mode
20 images were acquired in NORMAL mode
3 images were acquired in SERIAL mode
3 images were acquired in STORAGE mode
1 images were acquired in TEST_CH mode
* Exposure time
32 images were acquired with an exposure of 0.000 <millisecond>
2 images were acquired with an exposure of 140000.000 <millisecond>
6 images were acquired with an exposure of 15000.000 <millisecond>
2 images were acquired with an exposure of 160000.000 <millisecond>
2 images were acquired with an exposure of 230000.000 <millisecond>
9 images were acquired with an exposure of 300000.000 <millisecond>
2 images were acquired with an exposure of 35000.000 <millisecond>
2 images were acquired with an exposure of 37000.000 <millisecond>
2 images were acquired with an exposure of 40000.000 <millisecond>
4 images were acquired with an exposure of 800.000 <millisecond>
2 images were acquired with an exposure of 85000.000 <millisecond>
* Filter number
51 images were acquired in filter number "1"
2 images were acquired in filter number "2"
2 images were acquired in filter number "3"
2 images were acquired in filter number "4"
2 images were acquired in filter number "5"
2 images were acquired in filter number "6"
2 images were acquired in filter number "7"
2 images were acquired in filter number "8"
* Image compression algorithm
46 images were compressed with "Set Partitioning in Hierarchical Trees (SPIHT
LIFT)" algorithm
19 images were compressed with "Set Partitioning in Hierarchical Trees (SPIHT
TAP)" algorithm
* Image compression type
64 images were compressed "LOSSLESS"
1 images were compressed "LOSSY"
* Image compression ratio
Compression ratio varied between 0 and 2 with an average of 0.0307692
Image quality report
====================
* Saturated pixels
18 images with 0 saturated pixels
1 images with 2 saturated pixels
1 images with 4 saturated pixels
* Brightest pixel value
The brightest pixel in the images varied between 3451 and 16383, with an
average of 8124.85
HK report
=========
* Time span
This session covers the period between 2013-11-16T01:02:06 and 2013-11-
16T04:53:50
(SCLK between 437835726 and 437849630)
* Consumables
The filter wheel performed 12 moves for an accumulated total of 12374
The front door performed 2 moves for an accumulated total of 460
* Image processing
(All totals since last power up)
65 images were acquired for a total of 65
allocation errors ocurred for an accumulated total of 0
0 image processing errors ocurred for an accumulated total of 0
* Temperatures
The temperature of the CCD varied between -66.0403 and -52.3885 C
The temperature of the CH varied between -130.6 and -15.8875 C
* Memory consumption
The session started with 62177 blocks of free image memory, varied between
58627 and 62177 and finished with 62177 blocks free
* System flags
The camera was booted nominally
* Door position
The session started with the door encoder value at 9 and finished with 9
UDP HK report
=============
* Time span
This session covers the period between 2013-11-16T01:04:33 and 2013-11-
16T04:53:48
(SCLK between 437835873 and 437849628)
* File handles
The number of free handles changed from 1389 to 1387 in the course of the
session
During the session it reached a maximum of 1389 and a minimum of 1360
* Processing queues
OpNav processing queue changed from 0 to 0 in the course of the session,
with a maximum of 23 and a minimum of 0
Science1 processing queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science2 processing queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science3 processing queue changed from 0 to 0 in the course of the session,
with a maximum of 23 and a minimum of 0
* Downlink queues
OpNav downlink queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science1 downlink queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science2 downlink queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
Science3 downlink queue changed from 0 to 0 in the course of the session,
with a maximum of 0 and a minimum of 0
* Thermal control
The camera head heater had an average duty cycle of 46.0968, with a maximum
of 81.0739 and a minimum of 0
The baffle heater had an average duty cycle of -1.23113, with a maximum of
30.1649 and a minimum of -26.1751
Event report
============
* Warnings and errors
1 notifications of type 2008 -> Error Log: The log is corrupted HANDLE =
1 notifications of type 2088 -> MCU: Door was commanded to close, but encoder
says, it's closed.
2 notifications of type 2240 -> Downlink Manager: Some queues where reset =
* HK Monitor alarms (experimental, handle with care)
37 alarms found !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
During the operational slot the camera performed nominal from the engineering point of view. All the images were acquired as scheduled and received without any missing packet.
The images acquired during the operational slot were analyzed in four aspects. First, the correctness of the exposure times was assessed as per AD2. Second, the dark current was analyzed to evaluate the evolution of bulk dark current and the warm pixel generation rate. Third, the status of the extra charge was assessed. Finally, the images were examined for the presence of streaks caused by particles slowly drifting away from the spacecraft.
As in previous checkouts standard exposure times were used for darks and flats and a random star field was imaged with the usual exposure times:
Table 1: Exposure times of star field per filter.
==========================================================================
Filter Exposure (ms)
1 15000
2 37000
3 40000
4 140000
5 160000
6 85000
7 35000
8 230000
===========================================================================
Is is worth mentioning that in RCS attitude control mode most of these exposure times lead to significant smearing of the images. However this does not hamper the evaluation of the status of the cameras.
The dark current generation rate was analyzed and compared with previous in flight measurements. The bulk dark current shown in Figure 1 is consistent with that determined during ICO (dotted line). To assess the generation rate of warm pixels, we compare the histograms for DC065 with DC053 in Figure 2. The number of warm pixels has increased slightly since DC053. Figure 3 shows the same plots for FC2. For both cameras, the hottest pixel has a dark current generation rate below 50 DN/s.
Figure 1: Bulk dark current for DC048. Left: FC1, right: FC2. The dotted line is the bulk dark current model derived from ICO observations.
Figure 2: FC1 warm pixel histograms for DC053 and DC065.
Figure 3: FC2 warm pixel histograms for DC053 and DC065.
An important part of the semi-annual checkout is monitoring the evolution of extra charge. FC1 is known to show extra charge, and it is found again in the DC053 images, as shown in Figure 4. The level of extra charge has not increased compared to DC041 (Figure 5). No extra charge has been detected in the past for FC2 at the illumination levels provided by the calibration lamp, and this is still the case in DC048. As the spacecraft approaches Vesta, there are a number of activities planned to conduct the same investigation for the much higher photon flux at the asteroid.
Figure 4: FC1 extra charge levels in DC065.
Figure 5: FC1 extra charge levels in DC053.
No image streaks were found in DC065
Concerning the hardware and the software, the operational slot demonstrated that the camera is in good operational condition, including the mechanisms. With respect to the operational procedures, this slot demonstrated again an excellent performance of the instrument, spacecraft and mission teams. The command sequences for the non-pointed semi-annual checkout for both FC1 and FC2 meet the design criteria.