STScI Logo

Space Telescope Imaging Spectrograph
CCD Full-Field Sensitivity Monitor C17

STIS Cycle-17 Calibration Phase-1

Last Revised:			1 September 2009
Proposal ID:			11854
Title:				CCD Full-Field Sensitivity Monitor C17
PI:				Dr. Charles R. Proffitt
Co-I(s):			Dr. Paul Goudfrooij

---------------------------------------------------------------------------
# Orbit estimates are TOTAL for all of Cycle 17; assume 72 weeks) 

Total Prime Orbits:             1
External Parallel Orbits:       0
Internals or no-impact orbits:  0
Comments on orbit estimate:     1-orbit visits, executed annually


---------------------------------------------------------------------------
# This section should be written with a GO audience in mind -- use 
# Calibration plans in WFPC-2 handbook as a guide.

Purpose: To monitor CCD sensitivity over the whole field of view

Description:
Measure a photometric standard star field in Omega Cen in 50CCD
mode every few months to monitor CCD sensitivity over the whole
field of view. Keep the spacecraft orientation within a suitable
range (+/- 5 degrees) to keep the same stars in the same part of
the CCD for every measurement. This test will give a direct
transformation of the 50CCD magnitudes to the Johnson-Cousins system
for red sources. These transformations should be accurate to 1%.
The stability of these transformations will be measured to the
sub-percent level. These observations also provide a check of the
astrometric and PSF stability of the instrument over its full field
of view.

Accuracy:                       1%
Comments on Accuracy:           
Products:                       ISR, STAN


---------------------------------------------------------------------------
# Link to Cycle 17 Science
# Use the GO + GTO Phase 1 exposure listing and derived statistics
# posted on WWW.

Fraction of science programs supported by this calibration:     10%

List categories of science that can't be executed until after this proposal:
None.

List categories of science that are best performed contemporaneous with 
this proposal:
None.


---------------------------------------------------------------------------
# THE REST OF THIS FORM IS FOR INTERNAL USE
---------------------------------------------------------------------------
Observation summary: 
Keep the spacecraft orientation within a suitable range (+/- 5
degrees) to keep the same stars in the same part of the CCD for
every measurement.

# Target information (copy for each target)

Target Name.............................:	NGC5139
RA......................................:	3H25M37.0400S +/- 0.1S
Dec.....................................:	-47D35'38.30" +/- 0.1"
Flux (and units)........................:	V = 14.5
Visibility window (if known or relevant):	
Comment on choice of target:
NGC5139 IS A PHOTOMETRIC STANDARD FIELD KNOWN FROM WFPC2.
For consistency with previous observations, we use the GSC1 coordinates.

# Exposure list plan at the Phase I level. Be as complete as reasonable. 
# If possible information should be complete enough to allow easy 
# submission of a Phase 2 from this form. However, if you have to leave
# some of the fields blank below, or want to provide the information
# in another format, that is acceptable. (Make sure you do the BOP checking
# though, as this is a phase-1 issue.)

Table of exposures (copy for each exposure as appropriate/desired):

Target or lamp..........................: NGC5139
Type of Acquisition.....................: 
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CCD
Central Wavelength......................: 
Exposure Time...........................: 10s, CR-SPLIT=5
Number of Iterations ...................: 1
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4, STIS-CCD-BOX (4-point pattern)
Comments: To be observed annually


Target or lamp..........................: NGC5139
Type of Acquisition.....................: 
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CCD
Central Wavelength......................: 
Exposure Time...........................: 60s, CR-SPLIT=2
Number of Iterations ...................: 1
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4
Comments: To be observed annually


Target or lamp..........................: NGC5139
Type of Acquisition.....................: 
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CCD
Central Wavelength......................: 
Exposure Time...........................: 10s, CR-SPLIT=5
Number of Iterations ...................: 1
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4, AMP=C
Comments: To be observed annually


Target or lamp..........................: NGC5139
Type of Acquisition.....................: 
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CCD
Central Wavelength......................: 
Exposure Time...........................: 60s, CR-SPLIT=2
Number of Iterations ...................: 1
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4, AMP=C
Comments: To be observed annually


Target or lamp..........................: NGC5139
Type of Acquisition.....................: 
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CCD
Central Wavelength......................: 
Exposure Time...........................: 10s, CR-SPLIT=5
Number of Iterations ...................: 1
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4, AMP=A
Comments: To be observed annually


Target or lamp..........................: NGC5139
Type of Acquisition.....................: 
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CCD
Central Wavelength......................: 
Exposure Time...........................: 60s, CR-SPLIT=2
Number of Iterations ...................: 1
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4, AMP=A
Comments: To be observed annually


---------------------------------------------------------------------------
# Special needs of this proposal?

Scheduling: BETWEEN 15-JAN-2010:00:00:00 AND 20-MAR-2010:00:00:00

Prerequisites: None

PDB update?               N
On-board table update?    N

# Special Requirements:
Real time?                N
Special commanding?       N
Quick Data turnaround?    N
Special timing required?  N
Other?                    N
Describe (& justify) special requirements:


-------------------------------------------------------------------------
# Analysis Plan

Expected FTE weeks for analysis:                                2
Required turnaround on analysis (weeks):                        ~6
Data volume (Mb needed for analysis):                           100
Special software needed for analysis? (Describe):		No

Description of analysis Plans:	(1-2 paragraphs)
Perform aperture photometry of all adequately isolated stars in the
field of view. The results will enable checking of the long-term
full-field photometric stability of the instrument.  Transformations
from the Johnson-Cousins photometric system can be derived for the
50CCD aperture. The observations also provide a check of the
astrometric and PSF stability of the instrument over its full field
of view.