| IOC-MIPS_315a | 10540C | ||||||||
| Title: | Characterize MIPS Behavior as a Function of Sky Background | ||||||||
| Objective: | Determine whether latent image behavior, responsivity, and photometric stability have any dependence | ||||||||
| on sky background levels. | |||||||||
| Description: | Point sources of approximately the same brightness will be observed in regions with ~ 1 MJy/sr, 10 MJy/sr, and 100 MJy/sr backgrounds. | ||||||||
| including flow / state diagram | Each point source will be observed using both photometry and scan map AOTs. | ||||||||
| At each of three locations corresponding to the three sky levels: | |||||||||
| 1) Construct a slow mode scan map including both forward and reverse scans. | |||||||||
| Integrate for a total of 100 seconds on the source. | |||||||||
| 2) Switch to photometry mode and acquire: | |||||||||
| A 4x4 dither using 10-second exposures at 24um. | |||||||||
| A 4x4 dither using 10-second exposures at 70um with coarse pixels. | |||||||||
| A 4x4 dither using 10-second exposures at 70um with fine pixels. | |||||||||
| At 6 positions using 10-second exposures at 160um. | |||||||||
| Place in Schedule: | |||||||||
| (relative to water shed events) | After the aperture cover is opened. | ||||||||
| Required Conditions: | |||||||||
| MIPS apertures must have been located and basic instrument functionality checked. | |||||||||
| The telescope induced background at each wavelength should be less than 10% of the sky: | |||||||||
| 24um | 70um | 160um | Chart gives W/m^2/sr | ||||||
| 1MJy/sr | 3.00E-09 | 1.00E-09 | 5.00E-10 | ||||||
| 10MJy/sr | 3.00E-08 | 1.00E-08 | 5.00E-09 | ||||||
| 100MJy/sr | 3.00E-07 | 1.00E-07 | 5.00E-08 | ||||||
| 1MJy/sr | 25 | 10 | 5.5 | on terms of T | |||||
| 10MJy/sr | 28 | 12 | 6 | ||||||
| 100MJy/sr | 30 | 13 | 7 | ||||||
| Resources: | |||||||||
| duration (best estimate) | 3 hrs. | ||||||||
| real time downlink (Y / N) | no | ||||||||
| special post event actions (Y / N) | no | ||||||||
| The scan map will generate 3x2x3x20 DCEs=360DCEs. | |||||||||
| The photometry mode will generate 3x(16+16+16+6) DCEs = 162 DCEs | |||||||||
| Outcome: | |||||||||
| description | We will understand whether any modifications to MIPS operation as | ||||||||
| a function of sky background are needed. | |||||||||
| can proceed in parallel with other activity | no, requires dedicated pointing | ||||||||
| must outcome be confirmed before next event / test /activity | no | ||||||||
| method of confirmation (sensor TLM, data analysis, etc.) | data analysis | ||||||||
| estimate of data turn around if required for confirmation | N/A | ||||||||
| Unique or included in planned AOT? | |||||||||
| Uses planned AOTs (photometry and scan map). | |||||||||
| Contingency Plan: | |||||||||
| "What if..." | If test fails it should be repeated. | ||||||||
| IOC Critical | Y | ||||||||
| References: | |||||||||
| Template last updated: | 9/6/99 | ||||||||
| M. Rieke | |||||||||