README web version of /home/usg/OPS/MTS/readme_xml/readme_75048200

Principal Investigator Email Address

• kalas@astron.berkeley.edu

Estimated Total Execution Time (hours, including overheads)

• 11.5 hours

General Description

• The goal is to obtain high contrast observations of the bright star HD
   139664.  This star has a near edge-on circumstellar disk with midplane oriented
   at PA=75 degrees.  Science observations are best acquired when the telescope diffraction
   spikes are not at this angle.  Observations consist of OB pairs consisting of one
   OB of HD 139644 and one OB of a PSF reference star, where both OB's are at the same
   wavelength.
  
  If different rotator tracking modes are available, then the PSF subtraction from
   star to star is most successful if the rotator keeps the pupil fixed and the sky
   is allowed to rotate.
  
  Coronagraphic images are obtained with the 1.4" opaque occulting spot, and each
   OB has an acquisition, a short exposure sequence and a long exposure sequence. 
   The DIT value can be modified according to the seeing and AO performance of the
   night.  The exposures may be in the non-linear regime.
  With respect to the scientific objective, it is not a problem for pixels out to
   ~1 to ~2 arcseconds radius to be non-linear.  Our region of scientific
  interest is 3-5 arcseconds radius from the star.
  
  HD 139664 and the two PSF reference stars serve as their own wavefront reference
   source.

Waiver Requests

• we have an approved waiver that permits the observation of coupled OBs
   (science target + PSF star) that
  together may not exceed 90 minutes.

Critical Observing Condition Constraints

• None.

Time-Critical Aspects

• In general the PSF subtraction will be most successful of the science
   target and at least one PSF target are observed within a short time of each other,
   for a given filter.  For example, rather than obtain J, H, K images of the target
   star on one  night, and J, H, K images of the PSF star on a second night, it is
   best to obtain the H-band data of the science target and at least one target star
   on the same night.
  
  OB's should be executed in pairs consisting of one HD 139664 OB at a given filter,
   and one PSF OB with the same filter.  
  The H-band OBs have priority number 1.

Special Execution Requirements

• If one of the PSF stars has a background star along the position angle
   of the science target circumstellar disk 
  (PA=75 degrees, between the occulting spot edge and 6" radius),
  then priority should be given to imaging the second PSF star.  
  
  Please contact me so that I may replace the failed PSF star with another target.

Special Calibration Information

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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 have PSF reference star OBs, do the names of those OBs begin with
 PSF_ ?

• YES

If there are Finding Charts attached to your OBs, is the field-of-view
 of at least one of these charts 2' x 2' (with clearly labelled field orientation)
 ?

• YES

Have you clearly marked and labelled your wavefront reference objects
 R1, R2, R3, ... (as specified in the NAOS Preparation Software) on your Finding
 Charts ?

• YES

Have you specified the magnitude of the brightest object in the field-of-view
 for each OB ?

• YES

Are there objects in any of your fields (including standard stars) which
 are brighter than the limits specified in the User Manual and on NACO web Pages
 ?

• NO

If the previous answer is yes, have you given a list of OBs and a justification
 for the brightness limit violation in the general description field ?

• N/A