STIS Cycle-25 Calibration Phase-1 Template Last Revised: Date Proposal ID: Title: STIS CCD Full Field Sensitivity PI: J. Debes Co-I(s): C. Proffitt --------------------------------------------------------------------------- # Orbit estimates are TOTAL for all of cycle-10; assume 52 weeks) Total Prime Orbits: 1 External Parallel Orbits: 0 Internals or no-impact orbits: 0 Comments on orbit estimate: 1 orbit visit 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 annually 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 Although this test is done using CCD imaging mode, the confirmation of detector stability and uniformity provided by this monitor is important for spectroscopic observations as well. All external orbits > 1800s. Accuracy: 1% Comments on Accuracy: Photometric accuracy Products: ISR --------------------------------------------------------------------------- # Link to Cycle 25 Science # Use the GO + GTO Phase 1 exposure listing and derived statistics # posted on WWW. Fraction of science programs supported by this calibration: 31% List categories of science which can't be executed until after this proposal: why: N/A List categories of science which are best performed contemporaneous with this proposal: why:N/A --------------------------------------------------------------------------- # THE REST OF THIS FORM IS FOR INTERNAL USE --------------------------------------------------------------------------- Observation summary: Take 50CCD images of Omega Cen field with Amplifiers A,C, and D with short and long exposures. Dither Amplifier D images. # Target information (copy for each target) Target Name………………………..:Omega Cen RA......................................: NGC5139 Dec.....................................: Flux (and units)........................: Visibility window (if known or relevant): Comment on choice of target: # 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.....................: None 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.....................: None 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: (e.g. Apr 1998, ~1yr after last performed in SMOV, or monthly) Prerequisites: (e.g., specific SMOV proposal; command development?) 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: 1 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.