IOC-MIPS_250a |
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10240C,10230C |
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Title: |
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Cosmic-ray limits on integration times |
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Objective: |
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To determine the maximum useful MIPS integration times in the |
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presence of cosmic-ray hits. |
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Description: |
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While illuminating the detectors at a low level with the stimulators, take images |
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at many different integration times up to the maximum allowed value to |
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evaluate the trade off between "background limited" and "not completely |
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Related: |
Low-background data taken at |
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swamped with particle hits." |
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different integration times to exercise the system. |
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For example, this could be accomplished by executing a series of photometry |
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AOTs over a range of integration times from 3 to 60 seconds. |
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E.g., 3, 10, 30, and 60 seconds. |
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Place in Schedule: |
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For 24um, the backgrd radiance must be less than 1.0E-11 W/cm2/sr (< 30K). |
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For 70um, the backgrd radiance must be less than 1.0E-12 W/cm2/sr (< 12 K). |
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For 160um, the backgrd radiance must be less than 5.4E-13 W/cm2/sr (< 6 K). |
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It may be possible to split this test into parts executed at different times based |
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on telescope temperature. |
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Location of MIPS apertures must be completed. |
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Basic instrument commanding and functionality must have been confirmed. |
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Required Conditions: |
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CTA temperature must be low enough that stray light is much lower |
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(20 %) than the background sky level in each band. |
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Boresite pointed to batch of sky without bright sources. |
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Pointing accuracy is not at all critical (better than a few arcminutes is fine), |
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but sources shouldn't be drifting across the array and so stability should be |
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better than 1" (about 1/2 a 24um pixel) over 60 seconds. |
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Resources: |
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duration (best estimate) |
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22 minutes |
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real time downlink (Y / N) |
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No |
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special post event actions (Y / N) |
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Special data analysis |
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Outcome: |
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description |
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SUR data for each MIPS array |
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can proceed in parallel with other activity |
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Yes |
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must outcome be confirmed before next event / test /activity |
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No |
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method of confirmation (sensor TLM, data analysis, etc.) |
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Data analysis |
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estimate of data turn around if required for confirmation |
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48 hrs |
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number of DCEs generated |
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144 |
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Unique or included in planned uplink or downlink/analysis tool |
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Can use photometry AOT |
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Special data analysis |
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Contingency Plan: |
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Acquire required data through normal operations. |
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"What if..." |
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This is a test of conditions external to SIRTF and |
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cannot fail. |
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IOC Critical |
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N |
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References: |
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Template last updated: |
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12-Sep-99 |
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C.W. Engelbracht |
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