| CAID: MIPS-921 | Title: Calibration stars against differing backgrounds | |
| System: MIPS | Principal: DHines | Deputy: cengelbracht, dfrayer, SStolovy |
| Objective: | Observe 3 flux standards on three different background levels in all three bands to check calibration. Same as MIPS 350 in duration and downlink, bt different targets. |
| Description: | Three flux standards from the MIPS SDD will be observed to determine the transformation from instrument to physical units. Three stars will hedge against faint debris disks. |
| Day: 45.7138888888876 | Suggested Order: | ||
| Must be preceded by these activities (list by CAID): MIPS-245, MIPS-246, MIPS-320, MIPS-322, MIPS-324 | |||
| Place in Schedule: | |||
| Priority: Necessary | |||
Conditions | |||
| Maximum telescope temperature: | 300 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: | 5 arcsec (1 sigma radial) | ||
| Maximum precision offset uncertainty: | 0.4 arcsec (1 sigma radial) | ||
| Observatory configuration: | |||
| Go/No Go criteria: | |||
Duration: 60 minutes
| | Real time downlink:
No | | |||
| Data Volume (uncompressed): 100 Mbits | |||
| List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): photometry AOT | |||
| List Analysis tools required (downlink): Standard pipelined data. S-IDP3 will be used to extract the photometry. Comparisons with standard Kurucz models pinned to 2MASS will be integrated over the appropriate MIPS bandpass to estimate the expected flux density. The conversion from DN/s to Jy/sec (per pixel or arcsec) will then be derived. | |||
| Estimate of data turn around: 48 hours | |||
| Description: The conversion factor between instrument units and physical units will be derived. The uncertainties must be dominated by the repeatability (4-5%), not by photon statistics.per se. | |||
| Can proceed in parallel with other activity: No | |||
| Must outcome be confirmed before next activity: No | |||
| Method of Confirmation: Three stars will be used. The conversion should be consistent (within the 4% repeatability). The stars should match predictions for a stellar atmosphere. A descrepency between bands may hail the detection of a debirs disk, or information that there is a problem with the system. | |||
| Success criteria: Sufficiently high S/N (100:1) must be obtained. Flat field and dark frames must be mature. There should be a consistent flux calibration from all 3 stars in each band. The solution should follo | |||
| Contingency plan: Find other stars | |||
Comments | |||
| References: MIPS SDD | |||
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Additional Comments:
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| This activity last updated: 4/26/2002 9:57:40 AM | |||