README web version of /home/usg/OPS/MTS/readme_xml/readme_82507101

Principal Investigator Email Address

• meise@mpia.de

Estimated Total Execution Time (hours, including overheads)

• 1.5

General Description

• 3C 273 is at MIDI's limits but we have successfully tracked fringes for
   this sources several times already, so it is possible. In this programme we mainly
   want to repeat the two existing uv points with higher S/N and better calibration
   to check our previous (very noisy) observations. We are also taking one additional
   uv point at a longer baseline to better constrain our models.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Seeing less than 1 arcsec.

Time-Critical Aspects

• Please see LST ranges in the OBs.

Special Execution Requirements

• - Please start with the calibrator HD 107328 and take acquisition images
   also for the calibrator (we need that for the data integrity checks of weak sources)
  - Then start with the acquisition of 3C 273: Take 24000 Frames for the acquisition
   images in order to identify the source.
  - Please ensure that the beam overlap is good to within about 1 px (the red / green
   crosses) before proceeding
  - Please set chopping to 1.3 Hz and start the fringe search
  - If the fringe was found and tracked succesfully, please repeat the fringe track
   manually (without taking photometry in order to not loose time moving the shutters)
  - If all went well, take the photometry and repeat it manually if everything worked
  - If there is time left, please go back to the calibrator HD 107328, make sure to
   take acquisition images
  
  Further remarks:
  - If there are difficulties, please go back to taking acquisition images to ensure
   good beam overlap (see above) and / or do another fringe search to ensure that you
   are tracking at the correct position (are there any known glitches at the current
   delay line positions?)
  - For us, baselines UT1-2 and UT2-3 are interchangeable if scheduling should make
   this necessary.
  - The finding chart is from our previous observations (081B-0092(A)). It has not
   changed since then.
  - We have included an OB for a backup calibrator (HD 108985)

Special Calibration Information

• ---(Empty)---

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 ?

• 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 ?

• 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 ?

• N/A

Did you verify that your coordinates are as accurate as possible (2Mass
 coordinates recommended) and that they include proper motions if available ?

• YES

Did you specify the LST range of the calibrators such that they cover
 the range from 30 min before the start of the LST range of the science target to
 30 min after the end of the LST range of the science target ?

• YES