Sequencer Site SIRTF IOC Activity c. 2002

CAID: MIPS-335 Title: 24 um PSF
 
System: MIPS Principal: krs Deputy: dhines
Objective:   
To measure the PSFs of the MIPS arrays.
 
Description: 
A bright star and asteroid will be observed.
Each target will be moved across a 3x3 grid of
positions in the focal plane.  At each position
3 sec integrations will be taken in an 8x8 grid
stepping by 1/4 pixel, in order to sub-sample
the PSF.  Thre 3x3 grid will be observed three
times, once at the center of the MIPS FOV, and
two other times spaced above and below by 1/2
array FOV.
 
Day:   77.6534722222277 Suggested Order:   R700
 
Must be preceded by these activities (list by CAID):   MIPS-305, MIPS-320
 
Place in Schedule:   After dust cover off
 
Priority:   Desired

Conditions

Maximum telescope temperature: 33 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:

Resources

Duration:   420 minutes
 
Real time downlink:   No   

Data Volume (uncompressed): 412 Mbits
 
List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): Standard AOT with custom IPP file upload for custom offsets.
 
List Analysis tools required (downlink):   High quality flat-fields or illumination corrections in place. Good pipeline products.

Outcome

Estimate of data turn around:   504 hours
 
Description: 2D maps of the array PSFs
 
Can proceed in parallel with other activity: No
 
Must outcome be confirmed before next activity: No
 
Method of Confirmation:   Data analysis. Detailed PSF structure as a function of position on the array will be evaluated using several techniques including comparison with STiny TIM PSF models, encircled energy measurements and various profile characterization methods.
 
 
Success criteria: Observations: Must acquire sufficient sampling to ensure 4x oversampled PSF core over most of arrays. IOC Requirement: PSF should contain encircled energy in spec. Field distortions in P
 
Contingency plan:  Repeat with a brighter/fainter star and asteroid
 
 

Comments

 
References:  
 
Additional Comments:
Estimated times can be decreased considerably by doing only a portion of 1 scan/array. S/C offsetting accurate to 0.4" (TBR) for 24 mm, to 0.5" (TBR) for 70 mm and 1.5" (TBR) for 160 mm After CTA/instrument cool down: For 24um, the backgrd radiance must be less than 1.0E-11 W/cm2/sr (< 30K). For 70um, the backgrd radiance must be less than 1.0E-12 W/cm2/sr (< 12 K). For 160um, the backgrd radiance must be less than 5.4E-13 W/cm2/sr (< 6 K). Arrays flat-fielded; geometries measured. Bright asteroid in OPZ: Parthenope, Vesta, & Psyche are possibilities, but actual targets need to be reassessed. Asteroid should not show obvious photometric variability on timescales shorter than or comparable to the MIPS observations. You probably need to put in chops to sky between observations. Otherwise the slow response will kill you.
 
This activity last updated: 10/24/2001 3:53:24 PM