README web version of /home/usg/OPS/MTS/readme_xml/readme_78029501

Principal Investigator Email Address

• pierre.kervella@obspm.fr

Estimated Total Execution Time (hours, including overheads)

• 1.5

General Description

• This is an observation of the close environment of the bright and nearby
   Be star Achernar in order to search for a compact envelope.
  
  As we are searching for an angularly small envelope, we need a PSF star to be observed
   immediately before or after Achernar. For this purpose, we have selected hd9362,
   that is a photometric standard for the mid-IR (Cohen et al. 1999 AJ 117, 1864 catalogue).
   The two OBs "Achernar" and "PSF-hr9362" should be observed together (the order does
   not matter) in order to sample the same seeing conditions. The execution of the
   ""Achernar" OB takes 1 hour, while the "PSF-hd93262" OB takes 30 minutes. In total,
   this means we need 1.5 hour of continuous observations with VISIR.
  
  The two objects are very bright stars, that are easy to acquire with VISIR. In both
   cases, they are the brightest and (as far as we know) only object in the VISIR field.
  
  We have selected the "MoveToPixel" acquisition template nevertheless, in order to
   have the object properly positioned for the subsequent "perpendicular" chopping-nodding
   (our sources are point-like). The amplitude of the chopping amplitude is set to
   10".

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• No critical observing conditions

Time-Critical Aspects

• No time-critical aspects

Special Execution Requirements

• Both OBs of this run have to be obtained ***consecutively*** in order
   to sample the same seeing conditions.

Special Calibration Information

• The "PSF-hd9362" OB is a special PSF standard star for the "Achernar"
   OB.

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 ?

• N/A

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

If the provided finding chart is at a different wavelength than the observations,
 did you clearly describe in the README file how to identify the target?

• YES

Did you specify a guide star brighter than V=12mag within a field of
 r=5arcmin around the science target?

• NO