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STIS Cycle-21 Calibration Phase 1 Last Revised: 24 September 2013 Proposal ID: 13542 Title: STIS CCD Full-Field Sensitivity Monitor C21 PI: Dr. Julia Roman-Duval Co-I(s): Dr. Charles R. Proffitt --------------------------------------------------------------------------- # Orbit estimates are TOTAL for all of Cycle 21 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 annually to monitor CCD sensitivity over the whole field of view. 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 21 Science # Use the GO + GTO Phase 1 exposure listing and derived statistics # posted on WWW. Fraction of science programs supported by this calibration: 20% 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......................................: 13H25M37.0400S +/- 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.....................: 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: Once during Cycle 21. Should roughly match most common orient from previous observations. ORIENT 310D; BETWEEN 15-JAN-2014:00:00:00 AND 20-MAR-2014:00:00:00 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: 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.