ACS SMOV activities at STScI
Guido De Marchi - ESA/STScI - ACS Group
STScI involvement in ACS SMOV activities required to:
• Develop special commanding proposals
• Guarantee smooth transition from SMOV to Calibration
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001
Load and dump on-board memory
Activity ACS02
Description
Purpose
Test the control section of the on-board memory
SMOV requirement
Demonstrate the ability to load and dump on-board
memory [J.10.4.3.1.4]
Details
Orbits / Duration
1 hour
Data Volume
8 MB
Peak Rate
0.1 Gb/orbit
Principal Investigator
C. Cox
Dependencies
-
Implementation
Special commanding
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001
Science data buffer check
Activity ACS03
Description
Purpose
Test the integrity of all memory areas against
bit flips due to passages through SAA
SMOV requirement
Demonstrate the ability to read and write data
from and to the science buffer [J.10.4.3.1.5]
Details
Orbits / Duration
12 hour
Data Volume
132 MB
Peak Rate
0.5 Gb/orbit
Principal Investigator
C. Cox
Dependencies
Load/dump on-board memory [ACS02]
Implementation
Special commanding
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001
CCD temperature set point
determination
Activity ACS06
Description
Purpose
Determine the lowest temperature at which the CCD
can be operated in a stable manner
SMOV requirement
Demonstrate the ability of the TEC to cool and
stabilize the CCD temperature [J.10.4.3.1.9]
Details
Orbits / Duration
36 hour
Data Volume
1410 MB (WFC) + 90 MB (HRC)
Peak Rate
1.1 Gb/orbit
Principal Investigator
C. Cox, M. Clampin, G. Hartig
Dependencies
-
Implementation
Special commanding / Real-time
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001
WFC/HRC flat field stability
ACS18/ACS19
Description
Purpose
Check and characterize flat-field uniformity and
stability using dithered imaging of moderately
crowded stellar fields in several filters
SMOV requirement
Measure flat field uniformity, stability and
cosmetic defects for all cameras and compare
internal flats to sky flats [J.10.4.3.4.5]
Details
Orbits / Duration
20 (WFC) + 13 (HRC)
Data Volume
1888 MB (WFC) + 184 MB (HRC)
Peak Rate
1.0 Gb/orbit
Principal Investigator
R. Bohlin
Dependencies
ACS to FGS alignment [ACS11]
Implementation
Stored commanding (SMS)
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001
ACS Sensitivity
Activity ACS20
Description
Purpose
Test and verify the sensitivity of all cameras
through all filters using spectro-photometric
standard stars; employing sub-arrays will limit
both data volume and read-out times
SMOV requirement
Instrument sensitivity shall be measured for a
subset of ACS modes [J.10.4.3.4.3]
Details
Orbits / Duration
12(WFC) + 5(HRC) + 2(SBC)
Data Volume
58MB(WFC)+ 58MB(HRC)+ 32MB(SBC)
Peak Rate
0.1 Gb/orbit
Principal Investigator
R. Bohlin
Dependencies
ACS to FGS alignment [ACS11]
Implementation
Stored commanding (SMS)
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001
SBC flat field uniformity
Activity ACS24
Description
Purpose
Check and characterize the uniformity of lowfrequency flat-fields through dithered imaging of
moderately crowded stellar fields in UV filters
SMOV requirement
Measure flat field uniformity per pixel and
cosmetic defects for all cameras [J.10.4.3.4.5]
Details
Orbits / Duration
5
Data Volume
44 MB
Peak Rate
0.1 Gb/orbit
Principal Investigator
R. Bohlin
Dependencies
SBC filter check-out [ACS21]
ACS to FGS alignment [ACS11]
Implementation
Stored commanding (SMS)
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001
CCD hot pixel annealing
Activity ACS31
Description
Purpose
Test effectiveness of annealing process by
comparing pre- and post-annealing dark frames
SMOV requirement
The efficacy of the hot annealing process shall
be demonstrated [J.10.4.3.4.2]
Details
Orbits / Duration
28 hour
Data Volume
128 MB (WFC) + 4 MB (HRC)
Peak Rate
1.0 Gb/orbit
Principal Investigator
C. Cox
Dependencies
CCD functional test [ACS05]
Implementation
Stored commanding (SMS)
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001
CCD pre-flash test
Activity ACS32
Description
Purpose
Verify operation of flash LED on CCD to create
baseline for future flash measurements and to
facilitate planning of flash exposures
SMOV requirement
The CTE for each CCD detector shall be measured
[J.10.4.3.4.2 and HST Project directions]
Details
Orbits / Duration
5 hour
Data Volume
640 MB (WFC) + 40 MB (HRC)
Peak Rate
1.1 Gb/orbit
Principal Investigator
G. Hartig
Dependencies
CCD functional test [ACS05]
Implementation
Stored commanding (SMS)
Guido De Marchi – SMOV 3B readiness review – 25 Jan 2001