| CAID: MIPS-120 | Title: 24um stim calibration with celestial sources | |
| System: MIPS | Principal: dhines | Deputy: cengelbracht, dfrayer, SStolovy |
| Objective: | Measure the output of the MIPS 24um stimulators against the output of known stars. Checks STIM stability. This template tests the stimulator response at 24um. Longer wavelengths done separately. |
| Description: | Small field photometry AOT data on a standard star will be collected interspersed with stim flashes recorded using a 24um stim flash IER. Stimulator calibration at 24um. 1) Observe the star using photometry AOT with 3 second integrations and small field dither (1 cycle). 2) Observe the stimulator (Stimflash IER). 3) Repeat 1 and 2 five times. The observation needs a S/N in photons of 100:1 in the STIM and star so that only the uncertainty is dominated by repeatability (4-5%). The sky background should be low and carefully measured to subtract off both the star images and the stim flash. |
| Day: 33.0993055555591 | Suggested Order: E400 | ||
| Must be preceded by these activities (list by CAID): MIPS-320 | |||
| Place in Schedule: After aperture door is opened, MIPS first light (24 um), CSMM validation, and confirmation of on-board processing and basic 24um AOT testing. | |||
| Priority: Critical | |||
Conditions | |||
| Maximum telescope temperature: | 33 K | ||
| Minimum telescope temperature: | 5.5 K | ||
| Should activity be repeated if focus changes? | No Repeat if focus changes by 0 mm | ||
| Maximum absolute pointing uncertainty: | 60 arcsec (1 sigma radial) | ||
| Maximum precision offset uncertainty: | 60 arcsec (1 sigma radial) | ||
| Observatory configuration: | standard | ||
| Go/No Go criteria: | CE power must be available. CSMM must work. MIPS must be detecting light and not saturating on the target sources. | ||
Duration: 50 minutes
| | Real time downlink:
No | | |||
| Data Volume (uncompressed): 80 Mbits | |||
| List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): Uses photometry AOT and IER for stimulator flashes. | |||
| List Analysis tools required (downlink): The standard pipeline should produce sufficient quality data for the analysis. IDP3 as modified for SIRTF will be used to extract the photometry of the calibration star and measure the illuminating flux from the STIM flash. | |||
| Estimate of data turn around: 75 hours | |||
| Description: The conversion factor between instrument units (magnitudes) and physical units (Jy/pixel or Jy/sq arcsec) will be available for stimulator observations. The stability of the stims will be checked so we can evaluate the need or not for periodic stim monitoring. | |||
| Can proceed in parallel with other activity: No | |||
| Must outcome be confirmed before next activity: No | |||
| Method of Confirmation: The standard pipeline should produce sufficient quality data for the analysis. IDP3 as modified for SIRTF will be used to extract the photometry of the calibration star and measure the illuminating flux from the STIM flash. | |||
| Success criteria: The stimulator must be activated and enough flux intercepted by the array to achieve 100:1 S/N. At least 5 samples of the calibrator must be available (out of the 12 images returned per cycle). | |||
| Contingency plan: If the test fails, it must be repeated | |||
Comments | |||
| References: | |||
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Additional Comments:
Required Conditions: MIPS detector aliveness tests must have been performed. MIPS aperture position must be known well enough to place a star in the FOV. Backgrounds must be less than the equivalent of 50,000 photons/sec These values are predicated on the 24um flood illuminator providing 250,000 photons/s at FPA. Part 1=16DCEs Part 2=3DCEs Total=5x(16+ 3)=95DCEs. IOC | |||
| This activity last updated: 12/20/2001 12:11:42 PM | |||