README web version of /home/usg/OPS/MTS/readme_xml/readme_78071200

Principal Investigator Email Address

• feldt@mpia-hd.mpg.de

Estimated Total Execution Time (hours, including overheads)

• 4

General Description

• MIDI investigation of two massive young stellar objects.
  
  The objects are very faint in the optical, so guiding and tip/tilt correction on
   the science
  targets themselves is not possible.
  Since the regions mostly suffer from strong dust extinction, also the stars in the
   further
  vicinity of the science targets remain faint.
  
  From the four originally proposed targets, two turned out to be not practical because
   of
  too faint optical guide stars. We therefore adapted our strategy and now assign
   two 
  visibility measurements for each of the two remaining targets at different hour
   angles.
  
  With the AT's we aim for quite specific baseline length / projected position angle
  combinations to complement our MIDI observations already performed with the UT's.
   This
  is more or less reflected in the siderial time constraints.
  
  We hope for the following orientations for the 16m baseline:
  
  AFGL4176     : 2 visibility pointa around 80 deg and 100 deg
  
  Orion BN     : 2 visibility points around 56 deg and  74 deg
  
  For AFGL4176, AT observations have already been successful.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• none

Time-Critical Aspects

• none

Special Execution Requirements

• For Orion BN, we acknowledge that the Orion region is difficult to observe.
   The region is pervaded by strong extended emission making optical observations more
   complicated. The Coude optical guide star for the tip/tilt used in the OBs is therefore
   at a quite large distance to the science target (53 arcsecs), but it is bright and
   has proven to work with MIDI + UTs. 
  In case of problems, you can try a different optical star for the Coude guiding:
  
  MS-25:  RA = 05 35 15.27   Dec = -05 22 56.7  (J2000),  
          distance to target:  38 arcsecs from Orion BN,
          brightness:  I = 11.5 mag,  V = 13.2 mag

Special Calibration Information

• none

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 ?

• 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

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