| CAID: MIPS-121 | Title: 24 um Focus Confirmation | |
| System: MIPS | Principal: krs | Deputy: dhines |
| Objective: | Evaluate focus of 24um channel of MIPS at the nominal secondary position post-launch. Necessary test before status of SIRTF focus is declared. |
| Description: | The 24um focus test uses a standard 1x3 raster map in photometry mode with 1/8 array row steps and 3 sec DCE's. This will provide good sampling of the PSF with high signal to noise. Three stars (listed below) will be observed to hedge against possible (as yet unknown) debris signatures which would artificially extend the PSF. HD 158460 A1V HD 162004 G0V HD 158485 A4V Including slew time, the observations will consume approximately 32 minutes of wall clock. Accurate flat fields are essential for proper assessment of the PSF/focus. |
| Day: 33.0770833333372 | Suggested Order: D200 | ||
| Must be preceded by these activities (list by CAID): MIPS-100 | |||
| Place in Schedule: After aperture cover is opened. Accurate flat fields are essential for proper assessment of the PSF/focus. | |||
| Priority: Critical | |||
Conditions | |||
| Maximum telescope temperature: | 33 K | ||
| Minimum telescope temperature: | 5.5 K | ||
| Should activity be repeated if focus changes? | Yes Repeat if focus changes by 0 mm | ||
| Maximum absolute pointing uncertainty: | 10 arcsec (1 sigma radial) | ||
| Maximum precision offset uncertainty: | 5 arcsec (1 sigma radial) | ||
| Observatory configuration: | |||
| Go/No Go criteria: | |||
Duration: 32 minutes
| | Real time downlink:
No | | |||
| Data Volume (uncompressed): 136 Mbits | |||
| List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): Use photometry AOT | |||
| List Analysis tools required (downlink): 24um pipeline high S/N flat fields (>300:1) | |||
| Estimate of data turn around: 72 hours | |||
| Description: Will know if MIPS 24 micron array is in focus. Focus will be judged by the contrast between the peak and first Airy ring in comparison to predicted values. | |||
| Can proceed in parallel with other activity: No | |||
| Must outcome be confirmed before next activity: Yes | |||
| Method of Confirmation: Comparison of observed PSF with predicted PSF from STiny TIM. Also evaluate via cross-correlation method developed for IRAC. | |||
| Success criteria: Must execute before secondary move. | |||
| Contingency plan: Repeat if test fails. If star is not in focus, comparison with other data from IRAC will be required to understand the relative focus positions. Compare with 70um focus check. | |||
Comments | |||
| References: | |||
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Additional Comments:
Required Conditions: Basic MIPS functionality must have been confirmed and apertures located. | |||
| This activity last updated: 7/2/2002 10:35:27 AM | |||