PHT18 (Intermediate AOT in Sparse Mapping Mode with a PHT-P Detector)


								   (July 4, 1995)
PHT18 (Intermediate AOT in Sparse Mapping Mode with a PHT-P Detector)
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Prior to your visit at IPAC, for each target, please prepare the following parameters for 
entry into the PGA:

==> Common Data for All AOTs (explained on a separate sheet).

*  Note: you have to have PHT17 and PHT19 concatenated to this AOT; and you have to 
   use the same aperture and detector as in PHT17 and PHT19, and filters belonging 
   to the selected detector.

==> Parameters for All Filters:

o SOURCE TYPE:  P (point source) or E (extended source)

o APERTURE: Select one from the on-screen list (cf. ISOPHOT manual).

==> Parameters for Each Individual Filter:

o FILTER:  Select one from the on-screen list (cf. ISOPHOT manual).

o SOURCE FLUX DENSITY:  Jy for a point source or MJy/sr for an extended source.

* UNCERTAINTY IN SOURCE FLUX DENSITY:  Jy (point source) or MJy/sr (extended source). 
     Notes: this quantity determines the maximum expected source flux in the quantity
     [(SOURCE_FLUX_DENSITY + UNCERTAINTY_IN_SOURCE_FLUX_DENSITY) + (MAX_BACKGROUND_
     FLUX_DENSITY)], to be used in setting the detector dynamic range.  Values up to 10 
     times the SOURCE FLUX DENSITY are allowed. 

o MAXIMUM BACKGROUND FLUX DENSITY:  In units of MJy/sr.  If you have a background 
     dominated case, an accurate or conservative estimate of this parameter is more 
     important than the UNCERTAINTY IN SOURCE FLUX DENSITY.

* S/N:  Leave 0.0 if you want to enter the INTEGRATION TIME below or enter the requested
     minimum signal-to-noise ratio. 
            
* INTEGRATION TIME: Leave 0.0 if you have requested a minimum S/N ratio or enter the 
     requested minimum on-source integration time in power of 2 in seconds.  Note: if 
     you input a non-power of 2, it will be rounded up (e.g., 129 -> 256).  Also, 
     because of the detector drift effect, a minimum (on-source) integration of 32 sec 
     is recommended to achieve a 5% accuracy in the relative flux calibration.  But 
     if you have more or less uniform surface brightness distribution in the mapped 
     area, a shorter integration time can be used.