Sequencer Site SIRTF IOC Activity c. 2002

CAID: MIPS-400 Title: Flux Standard Screening and Linearity Check
 
System: MIPS Principal: dhines Deputy: cengelbracht, dfrayer, SStolovy
Objective:   
The purpose of this task is to perform the initial 
screening of the MIPS flux standards to weed 
out those standard stars that are unsuitable for 
calibration due to dust emission, contaminating 
background sources, etc.  Many stars at different 
flux levels will be observed, so these data are 
also suitable for checking the linearity of the 
flux calibration.
 
Description: 
At each wavelength, 10 stars will be observed using the standard photometry
AOT.  The bright stars will be observed using 3s DCEs, while the fainter
stars will require 10s DCEs.  Enough cycles will be performed to achieve
detections of nearby background sources as faint as 1% of the stellar flux 
(~500s at 24um and 70um) or to make confusion noise the dominant noise 
source at 160um (~50s).  The modes used are summarized in this table:

Wavelength(um)    Itime(s)    #cycles    Clock Time(s)    Data volume(Mbit)
        24                      3             10               809                 137.5
                                10              3               720                   87.1
        70                      3             12               909                 164.3
                                10              4                874                 114.8
       160                     3             10               657                   99.3
                                10              3                587                  63.3

Assuming 5 stars will be observed in each mode, the 
total time is 6.3 hr and the total volume is 3332 Mbit.

Stars from the MIPS SDD
 
Day:   85.7076388888963 Suggested Order:   W300
 
Must be preceded by these activities (list by CAID):   MIPS-352
 
Place in Schedule:  
 
Priority:   Desired

Conditions

Maximum telescope temperature: 6.5 K
 
Minimum telescope temperature: 5.5 K
 
Should activity be repeated if focus changes?   Yes     Repeat if focus changes by 0 mm
 
Maximum absolute pointing uncertainty: 5 arcsec (1 sigma radial)
 
Maximum precision offset uncertainty: 1.4 arcsec  (1 sigma radial)
 
Observatory configuration:
 
Go/No Go criteria:

Resources

Duration:   378 minutes
 
Real time downlink:   No   

Data Volume (uncompressed): 3332 Mbits
 
List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): photometry AOR
 
List Analysis tools required (downlink):   IRAF, IDL. 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.

Outcome

Estimate of data turn around:   72 hours
 
Description: This activity will provide a list of suitable MIPS flux standards.
 
Can proceed in parallel with other activity: No
 
Must outcome be confirmed before next activity: No
 
Method of Confirmation:   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.
 
 
Success criteria: Enough standards (3 per band) are found for calibration.
 
Contingency plan:  Find other stars to observe.
 
 

Comments

 
References:   MIPS SDD
 
Additional Comments:
 
This activity last updated: 1/2/2002 7:08:59 PM