README web version of /home/usg/OPS/MTS/readme_xml/readme_84087000

Principal Investigator Email Address

```
rkoehler@lsw.uni-heidelberg.de
```

Estimated Total Execution Time (hours, including overheads)

```
0:53
```

General Description

AO-Imaging of the young binary GG Tau A to obtain relative astrometric
 mesurements, in order to monitor the orbit of the binary.  GG Tau is a quadruple
 system, consisting of two binaries about 10 arcsec apart. We are interested in the
 northern binary with a separation of 0.26 arcsec.
Setup: We use NACO in the K-band and with the S13 camera (i.e. the smallest pixel
 scale) to obtain the best spatial resolution.  The reference sources for the AO
 are the targets themselves.  The DITs have been chosen to be well within the detector
 linearity limit.  Please adjust the DIT if the peak flux is too high!

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

Brightest targets in or near the field-of-view (all observations done
 with N90C10 dichroic):
GG_Tau_A: 7.4mag (science target itself)
CAL_TCC_039: 4.4mag (star Theta 1C Ori, 15 arcsec east of the target)

Time-Critical Aspects

```
none
```

Special Execution Requirements

```
none
```

Special Calibration Information

To calibrate the detector orientation and pixel scale, a field around
 the star TCC 039 in the Orion Nebula Cluster shall be observed.  Both OBs should
 be executed as close as possible in time, preferentially one immediately after the
 other.  No special PSF-calibrators are required.

ToO Information

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ToO Activators List

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Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

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Source(s) of Pre-imaging

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Pre-imaging sources not listed above

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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 ?

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 you have PSF reference star OBs, do the names of those OBs begin with PSF_ ?

```
N/A
```

If there are Finding Charts attached to your OBs, is the field-of-view of at least one of these charts 2' x 2' (with clearly labelled field orientation) ?

Have you clearly marked and labelled your wavefront reference objects R1, R2, R3, ... (as specified in the NAOS Preparation Software) on your Finding Charts ?

Have you specified the magnitude of the brightest object in the field-of-view for each OB ?

Are there objects in any of your fields (including standard stars) which are brighter than the limits specified in the User Manual and on NACO web Pages ?

If the previous answer is yes, have you given a list of OBs and a justification for the brightness limit violation in the general description field ?

```
N/A
```

Last creation of page: Tue Oct 6 15:40:32 2009
If you have comments, please contact usd-help@eso.org