| IOC-MIPS_335a | 10650C | ||
| Title: | MIPS Point Spread Functions | ||
| Objective: | To measure the PSFs of the MIPS arrays. | ||
| Description: | A bright asteroid will be placed in the FOV of each array. The PSF of that array will be measured by moving the mirror in small | ||
| (1/4 pixel) steps for a total of 80 steps to obtain the 1D PSF. Repeat at four S/C offsets to obtain the 2nd Dimension of the PSF | |||
| and 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). | |||
| Arrays flat-fielded; geometries measured. Bright asteroid in OPZ: Parthenope, Vesta, & Psyche are possibilities for December 2001 launch. | |||
| Resources: | |||
| duration (best estimate) | 80 pts/scan * 3 sec/pt = 4 min/scan; x 4 scans each array = 16 min; * 1.5 (for efficiency) = 24 min; * 4 arrays = 1.6 hours total | ||
| real time downlink | No | ||
| special post event actions | No | ||
| Outcome: | |||
| description | 2D maps of the array PSFs | ||
| 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 | ||
| Contingency Plan: | Repeat with a brighter/fainter asteroid | ||
| IOC Critical | N | ||
| References: | |||
| Template last updated: | 7/31/1998; JBK | ||
| Comments: | Estimated times can be decreased considerably by doing only a portion of 1 scan/array. | ||