README web version of /home/usg/OPS/MTS/readme_xml/readme_77054700

Principal Investigator Email Address

• rosine.lallement@aerov.jussieu.fr

Estimated Total Execution Time (hours, including overheads)

• 7 Hours

General Description

• This program has the peculiarity of associating 2 faint subdwarfs and
   7  ***  EXTREMELY BRIGHT  *** stars. 
  
  High resolution and very high signal-to-noise ratio (especially for the bright,
   nearby targets) are required.
  The region of interest is in the very blue, at 338 nm, thus low airmass is preferable.
   However,  in order to allow these priority B observations in non optimal conditions
   (in terms of airmass), the slit + ELEV mode acquisition is prefered to the image
   slicer. With the slicer atmospheric dispersion could lead to strong losses at 338
   nm, stronger than losses due to the seeing.  
  
  
  For the bright targets, 
     - a VERY HIGH S/N of the order of 1000 is required (expected features are extremely
   small), which can only be achieved adding a
       large number of short exposures.
     - acquisition requires high density filters.
      - a narrow slit (0.6") ensures the maximum resolution 
      - exposure times are *** ULTRA SMALL **. They are conservative upper limits
   estimated using the ETC.
        , separately in the red and blue, and for airmass=1, and seeing smaller than
   slit width)
      - finding charts have not been attached (useless)
      - they can be observed at any time during the visibility window, even in bad
   seeing and cirrus
        
     
  For the two faint targets: 
  - they can be observed at any time during the visibility window, but low airmasses
   (<1.6 for JL9 and <1.3 for ALS1274) are highly preferable  since the region
   of interest is in the very blue.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Low airmasses are highly preferable for all targets, especially the faint
   ones.

Time-Critical Aspects

• Targets have distributed RA's, and can be observed at any time during
   their visibility windows, but low airmasses are highly preferable.
  
  Targets can be grouped in April, except JL9 (June, July)

Special Execution Requirements

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Special Calibration Information

• High quality flatfields are the most important factor for the reduction.
   But, those acquired during day time are
  appropriate. We intent to co-add series of those FF.

ToO Information

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ToO Activators List

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Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

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Source(s) of Pre-imaging

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Pre-imaging sources not listed above

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Do all your OBs comply with the instrument-specific requirements listed
 on the instrument-specific Phase 2 web page ?

• YES

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing
 Category for each Observing Template ?

• N/A

Do all your finding charts comply with both the general and instrument-specific
 Phase 2 Web Pages ?

• YES

If you submitted OBs for standard stars, did you specify the magnitude
 and spectral type of all standard stars in the OBs ?

• N/A

Have you included OBs for any calibrations that you need but which are
 not part of the Calibration Plan ?

• N/A

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If you have preferences which OBs should be executed first, did you make
 use of the User Priority field in the OBs ?

• YES

If this is a run that requires coordinated observations with other facilities,
 did you give proper instructions in the Time-Critical Aspects Section ?

• N/A

If you need secondary guiding, are there suitable objects within 30 arcsec
 from your target ?

• N/A