| CAID: MIPS-340 | Title: Ultimate Scattered Light Levels #1 | |
| System: MIPS | Principal: mrieke | Deputy: jkeene |
| Objective: | Determine the level of scattered background light within MIPS including when the scan mirror is moved to the "dark" position and when a source is place in the FOV. This test will indicate how well the total power mode will work. It will also indicate whether source glints are present. This test is the 24um portion. |
| Description: | Part 1: Diffuse light scattered into MIPS Point at a high background location (Galactic plane preferably). Place the 24um array into the dark with the scan mirror. Take 30 30-second integrations. Part 2: Observe a star which will not saturate in 3 seconds -- flux <=2 Jy at 24um. Take a total of 40 cycles of standard small field photometry mode AOR using 3 second expsoures. Part 3: Scattered light from stars adjacent to the field of view. Perform the following test for a bright star which would saturate if viewed directly. Place the star 20" outside the FOV. Take 30-second integrations with the 24um array while stepping the star by 15" along the side of the 24um array. Take 3 exposures at each step position. Repeat moving the star along the other 3 sides of the array. |
| Day: 77.945138888892 | Suggested Order: R700 | ||
| Must be preceded by these activities (list by CAID): MIPS-950H | |||
| Place in Schedule: Can begin after aperture door is opened, basic MIPS functionality is checked, and after the scattered background light monitor is complete. | |||
| Priority: Desired | |||
Conditions | |||
| Maximum telescope temperature: | 6.5 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: | 2 arcsec (1 sigma radial) | ||
| Maximum precision offset uncertainty: | 1 arcsec (1 sigma radial) | ||
| Observatory configuration: | Point at Galactic plane for part 1.Point at a bright star for part 2. | ||
| Go/No Go criteria: | Scan mirror and array readouts must be functional. | ||
Duration: 70 minutes
| | Real time downlink:
No | | |||
| Data Volume (uncompressed): 900 Mbits | |||
| List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): Should use the same IER as for measuring dark current for parts 1 and 3, use photometry mode AOR for part 3. | |||
| List Analysis tools required (downlink): | |||
| Estimate of data turn around: 48 hours | |||
| Description: Will understand scattered light levels within MIPS | |||
| Can proceed in parallel with other activity: No | |||
| Must outcome be confirmed before next activity: No | |||
| Method of Confirmation: data analysis | |||
| Success criteria: Obtained unsaturated data. | |||
| Contingency plan: If an unusually high background is observed, an analysis of the MIPS/CTA optical path will be needed. | |||
Comments | |||
| References: | |||
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Additional Comments:
It might be desirable to expand this test either by taking finer steps and/or by taking more exposures at each step position. | |||
| This activity last updated: 7/2/2002 4:46:53 PM | |||