README web version of /home/usg/OPS/MTS/readme_xml/readme_79025905

Principal Investigator Email Address

• wyatt@ast.cam.ac.uk

Estimated Total Execution Time (hours, including overheads)

• 2.0

General Description

• These observations will provide visibilities of HD113766 on quasi-orthogonal
   baselines if observed around 4 hours before and after transit.  The observations
   are labelled 1 and 2 for before and after transit respectively.  These will allow
   constraints to be placed on the geometry of the emission and so constrain the source,
   as different sources of circumstellar dust should produce different patterns of
   dust distribution. 
  As the true size of extension cannot be well constrained from current data, these
   observations will be combined with those from run G (079.02589(G)) as these provide
   quasi-orthogonal baselines of a much longer length.
  Note that the science target has a companion at 1.2 arcsec (PA ~280 degrees) of
   similar brightness at V (8.1 and 8.3 mag for primary and companion respectively),
   although the companion should be much fainter at N (~66mJy compared to a total flux
   of 1.5 Jy for our science target). OUR SCIENCE TARGET IS THE EASTERN-MOST SOURCE.
   
  We have checked the ability of MACAO to guide on the science target in our recent
   visitor observations, and no problems were found.  In case of bad seeing or other
   guiding issues, there is a guide star at an offset of 0.6 arcmin from the target
   at a position angle of 205 degrees, coordinates RA 13:06:34.370, Dec -46:02:34.700,
   V mag 14.48. 
  Our recent visitor mode observations included a closer binary pair. We found that
   problems could arise in IRIS from a close binary even if the MACAO loop was closed.
    We would ask that the science target be observed before the calibrator to ensure
   there is enough time for these observations if IRIS problems occur (in a worst case
   scenario we could use other calibrators from the nights observing).

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• This run is to be performed on baseline UT1-UT2 in clear conditions.

Time-Critical Aspects

• The two observations of our target should ideally be taken with as great
   a time difference between the two as possible (ideally 4 hours before transit and
   4 hours after transit) to get quasi-orthogonal baselines and so constrain the geometry
   of the source. Thus these observations would ideally be carried out before the end
   of July, but can be taken later with shorter times between the two OBs.

Special Execution Requirements

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Special Calibration Information

• The calibration star is of spectral type M0III.  Visibilities used to
   predict the correlated magnitudes are from the SearchCal tool of the ASPRO programme.
    Flux levels and magnitudes are in the OB files. The angular size of the calibrator
   is 3.066 mas.
  
  We request that the calibration be performed after the science observation.  This
   means that should there be trouble with IRIS due to the presence of the binary at
   1.2 arcsec there will be enough time to complete the science observation, and should
   there be no time for the calibrators, we can use archive calibration observations
   from the night.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

Source(s) of Pre-imaging

• ---(Empty)---

Pre-imaging sources not listed above

• ---(Empty)---

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 ?

• YES

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

• YES

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 ?

• N/A

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

Did you indicate for each science star OB the corresponding calibrator
 star OB (and vice versa) in the 'Instrument Comments' field ?

• YES

Did you check that your chosen calibrator is bright enough for the instrument
 mode used ?

• YES

If you use calibrator stars which are not in the CalVin database, did
 you specify their characteristics in the README file and in the OBs ?

• YES