| IOC-MIPS_240a | 10690C | ||
| Title: | MIPS spectral leak checks | ||
| Objective: | To check the MIPS filters for short-wavelength leaks | ||
| Description: | Place a bright star in the FOV of each array. Scan the mirror in small steps (1/4 pixel) for a total of 80 steps to obtain the 1D PSF. | ||
| Repeat at different S/C offset for redundancy. | |||
| Place in Schedule: | After dust cover off | ||
| Required Conditions: | S/C offsetting accurate to 0.4" (TBR) for 24 mm, to 0.5" (TBR) for 70 mm and 1.5" (TBR) for 160 mm | ||
| After CTA/instrument cool down: | |||
| For 24um, the backgrd radiance must be less than 1.0E-11 W/cm2/sr (< 30K). | |||
| For 70um, the backgrd radiance must be less than 1.0E-12 W/cm2/sr (< 12 K). | |||
| For 160um, the backgrd radiance must be less than 5.4E-13 W/cm2/sr (< 6 K). | |||
| Need suitable star in OPZ; e Car a Boo are candidates for 70 and 160 mm. Need a fainter star, such as b Leo, for 24 mm. | |||
| Resources: | |||
| duration (best estimate) | 80 pts/scan * 3 sec/pt = 4 min/scan; * 2 scans = 8 min; * 1.5 (for efficiency) = 12 min; * 4 arrays = 48 min total | ||
| real time downlink | No - dedicated observing | ||
| special post event actions | No | ||
| Outcome: | |||
| description | Scans of the 1-D PSF of each filter taken with a hot source | ||
| can proceed in parallel with other activity | No; dedicated observing | ||
| 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 | |||
| Unique or included in planned uplink or downlink/analysis tool | Specialized IET and data analysis of the PSF power spectrum to derive the high-frequency components | ||
| Contingency Plan: | Repeat with different star, integrate longer | ||
| IOC Critical | N | ||
| References: | |||
| Template last updated: | 7/28/1998; JBK | ||