| IOC-MIPS_130a | 10450C,10460C | ||
| Title: | 24 mm and 70 mm array geometries and scan mirror vectors. | ||
| Objective: | To measure the pixel sizes and the relative locations ( i.e., array orientation, scale and distortion) as a function of scan mirror angle. | ||
| Description: | Place a bright star near one corner of the array and operate the scan mirror to cover the entire array in 1/2 (TBR) pixel steps. | ||
| The scan mirror and S/C should then be offset to place the star near the other corner of the array and the procedure repeated. | |||
| The whole process should be repeated for redundancy. | |||
| Place in Schedule: | After dust cover off | ||
| Required Conditions: | S/C pointing understood to <10" (TBR); offsetting to <0.5" and stable to 0.5" in 500 sec (TBR) | ||
| After CTA/instrument cool down to a level where bright stars can be seen: | |||
| For 24um, bakground must be less than 4.0e-10 W/cm^2/sr (< 37 K). | |||
| For 70um, background must be less than 1.2e-10 W/m^2/sr (< 16 K). | |||
| Need bright star in the OPZ. | |||
| Resources: | |||
| duration (best estimate) | 3 sec/pt * 2 Npixel pts/scan * 4 scans * 1.5 (for efficiency) = 38, 19 & 19 min at 24, 70, & 70 mm = 1.3 hr total. | ||
| real time downlink | No | ||
| special post event actions | No | ||
| Outcome: | |||
| description | Maps of the pixel locations as a function of scan mirror angle. | ||
| 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 different stars, integrating longer, using more S/C offsets. | ||
| IOC Critical | Y | ||
| References: | |||
| Template last updated: | 9/14/99; J. Keene | ||
| Comments: | Ultimately we would like to measure the field to 1/4 pixel accuracy. This would increase the time necessary by x 2. | ||
| This can probably be done after IOC. | |||