README web version of /home/usg/OPS/MTS/readme_xml/readme_78506001

Principal Investigator Email Address

• skraus@mpifr-bonn.mpg.de

Estimated Total Execution Time (hours, including overheads)

• 3

General Description

• Located in the Orion Trapezium cluster, Theta1 Ori C (=T1ORIC) is one
   of the youngest and nearest high-mass stars, and also known to be a close (<
   43 mas) binary system.  We expect periastron passage for the system in 2007 and
   want to trace the rapid orbital motion expected around that time.
  
  To obtain a sufficient position angle coverage, we require observations on at least
   one non-linear configuration (D0-H0-G1 or A0-K0-G1), if possible combined with a
   linear configuration (E0-G0-H0 or A0-D0-H0).
  
  *** AUGUST AND SEPTEMBER 2007:
  Due to the restrictions imposed by the length of the delay lines, we recommend to
   use the telescopes configurations with the shorter baselines (D0-H0-G1 and E0-G0-H0)
   in August/September 2007, although in September also A0-K0-G1 can be used.
  
  Since the source becomes observable only at the end of the night, we suggest observing
   the calibrator star first and to switch then to the science target as soon as it
   becomes accessible.  Therefore, we have prepared OBs not only for the standard calibrator
   (HD33256), but also for an alternative calibrator which becomes accessible more
   than an hour earlier (HD32613).

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None.

Time-Critical Aspects

• Due to the impending periastron passage and the coordination with other
   ground and satellite-based observations, this programme is time-critical.
  
  Therefore it is important to obtain a good AMBER uv-coverage already in July to
   September 2007. Observations below 30 degree horizon distance or in dawn are also
   acceptable (the Sidereal time constraints given the OBs can be ignored)!

Special Execution Requirements

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Special Calibration Information

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ToO Information

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ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

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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 ?

• YES