README web version of /home/usg/OPS/MTS/readme_xml/readme_60905304

Principal Investigator Email Address

```
skraus@mpifr-bonn.mpg.de
```

Estimated Total Execution Time (hours, including overheads)

```
2
```

General Description

Theta 1 Orionis C is the brightest star in the Orion Trapezium cluster
 (K=4.4, H=4.5) and an unique target to study the properties of young hot stars.
With this programme, we would like to measure the geometry of the Brackett gamma-line
 emitting region around 2.1662 micron using AMBER's high-resolution mode (HR-2.172).
Please adjust the DIT according to the FINITO performance - our main aim is to measure
 differential observables with high accuracy.

As primary calibrator we choose HD33833, which is a G7III-type star with K=3.8,
 H=3.9 and a diameter of UD=0.834+/-0.058 mas (determined with ASPRO).
For the case that some problems occur with this calibrator, we have prepared also
 OBs for an alternative calibrator (HD36059, G5, K=4.7, H=4.9, UD=0.549+/-0.038,
 determined with ASPRO).

If possible, observations should be carried out at two hour angles.  The object
 rises above airmass 1.5 at LST 2:37, i.e. about 4 hours before sunrise during the
 SV nights.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
None
```

Time-Critical Aspects

```
None
```

Special Execution Requirements

```
None
```

Special Calibration Information

```
None
```

ToO Information

```
None
```

ToO Activators List

```
None
```

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

```
None
```

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 ?

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 ?

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 ?

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

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 ?

Do you use the same DIT for pairs of science target and associated calibrator?

Are the magnitudes of science target and calibrator within +/- 1 mag ?

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

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 ?

Last creation of page: Tue Oct 6 15:40:06 2009
If you have comments, please contact usd-help@eso.org