MIPS_305a Pipeline Flats

IOC-MIPS_305a     10870C          
Title:   Production of Pipeline-quality Flatfields for MIPS            
                 
Objective:   Acquire both sky and internal flatfields for confirmation of thermal-vac performance and            
    initial use in the pipeline. A star will be observed at a grid of positions across each            
    array and flatfielded to look for location dependences of photometric sensitivity.            
                 
                 
Description:              
including flow / state diagram              
  Sky flats will be construct from scan maps of a ~30'x30' region devoid of bright sources.              
  Each point in the map will require 100-seconds of integration using 10-second exposures and              
  the slow scan mode              
  Internal flats will be acquired using the MIPS flat field projectors for each array and will              
  be taken for all three positions applicable to the 70um array (fine, coarse, SED).              
  Ten 10-second exposures will be taken at each flatfield/array combination.              
  Last, a star will be observed using a 10x10 dither and 10-second exposures on the 24 um array.              
  At 70um, a star will be observed using a 6x6 dither and 10-second exposures.              
  At 160um, a star will be observed at 4 points per row of the array with 10-second expsoures.              
  These grids should be repeated to avoid corruption of any one location by a cosmic ray.              
                 
Place in Schedule:   After aperture cover is opened.          
(relative to water shed events)                
                 
Required Conditions:   Basic MIPS functionality must have been confirmed and apertures located.          
      The telescope must be fully cold to ensure that no contributions from warm structures are included in the flats.          
                 
Resources:                
                 
  duration (best estimate)     3.5hrs        
  real time downlink (Y / N)     no        
  special post event actions (Y / N)     no        
  Construction of sky flats generates 3x60x6=1080 DCEs.              
  Construction of internal flats will generate 40 DCEs.              
  Observation of star grids will generate 100+36+8=144 DCEs.              
                 
Outcome:                
  description         MIPS flatfields will be available, photometric corrections as a function of    
            field position will be available, and the difference between sky and internal flats will be known.    
  can proceed in parallel with other activity       no, requires dedicated pointing    
  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         N/A    
                 
Unique or included in planned AOT?                
            Use scan map and photometry AOTS, internal flat field EOT.    
               
Contingency Plan:                
"What if..."           Repeat if test fails. If radical differences between sky and internal flats are noted,    
            these will needed to be studied further.    
                 
IOC Critical           N    
                 
References:                
                 
Template last updated:           9/6/99    
            M. Rieke    
                 

Last Updated on 10/7/99
By Marcia Rieke
Email: mrieke@as.arizona.edu