| CAID: MIPS-150 | Title: Observing Mode Relative Throughputs | |
| System: MIPS | Principal: alberto | Deputy: |
| Objective: | The relative throughputs of all the modes of MIPS will be measured. Modify this to reflect that we should use the same sources for this as we use for other cross-calibrations - i.e., with IRS. |
| Description: | The calibration of MIPS will be based on measurements of stars using the Photometry AOT. This task confirms that the Scan Map and Total Power AOTs have the same throughput as the Photometry AOT and determines the relative throughputs between the SED and Photometry AOTs. Three different sources will be observed in all modes to ensure each array (24, 70, & 160 micron) will get a good observation. Two of the three sources should be point sources and the third an extend source to further check the relative behaviors of point and extended sources between modes. Ideally, all the sources would be observable (detected and not saturated) on all three arrays, but this might not be possible. All the observations will be done with 10 MIPS second exposures. For the 24um and 160um arrays, the modes observed will be Photometry, Scan Map, and Total Power AOTs. For the 70um array, the modes observed will be Photometry, Scan Map, Total Power, and SED AOTs. The throughputs between submodes internal to an AOT are assumed to be checked in the validation of the AOT. For example, the throughputs between the different exposures times associated with different scan rates in the Scan Map AOT. |
| Day: 69.5923611111139 | Suggested Order: Q600 | ||
| Must be preceded by these activities (list by CAID): MIPS-139, MIPS-140, MIPS-145, MIPS-148, MIPS-300, MIPS-320, MIPS-326, MIPS-330, MIPS-350 | |||
| Place in Schedule: This task is probably best done near the end of IOC. | |||
| Priority: Necessary | |||
Conditions | |||
| Maximum telescope temperature: | 6.5 K | ||
| Minimum telescope temperature: | 5.5 K | ||
| Should activity be repeated if focus changes? | No Repeat if focus changes by 0 mm | ||
| Maximum absolute pointing uncertainty: | 1.4 arcsec (1 sigma radial) | ||
| Maximum precision offset uncertainty: | 1 arcsec (1 sigma radial) | ||
| Observatory configuration: | Standard | ||
| Go/No Go criteria: | Array temperatures must be stable, detectors must be functioning nominally | ||
Duration: 180 minutes
| | Real time downlink:
No | | |||
| Data Volume (uncompressed): 1085 Mbits | |||
| List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): All standard AOTs. | |||
| List Analysis tools required (downlink): Standard MIPS data reduction pipeline | |||
| Estimate of data turn around: 72 hours | |||
| Description: Run data through pipeline. Integrate the point source observations (in a fixed aperture) in each mode and compare. Integrate different areas of the extended source and compare. | |||
| Can proceed in parallel with other activity: No | |||
| Must outcome be confirmed before next activity: No | |||
| Method of Confirmation: data analysis | |||
| Success criteria: High enough S/N data to access the relative throughputs between different modes and whether they are at their expected values. | |||
| Contingency plan: f this test fails to execute or if it gives ambiguous answers, normal observations can probably be used to give an indication of the relative throughputs. | |||
Comments | |||
| References: | |||
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Additional Comments:
The SED target must be chosen wisely and should complementary, if possible, to those of MIPS-135. (Thanks to D. Kelly for this comment). | |||
| This activity last updated: 10/22/2002 7:19:31 PM | |||