README web version of /home/usg/OPS/MTS/readme_xml/readme_81057201

Principal Investigator Email Address

```
brandner@mpia.de
```

Estimated Total Execution Time (hours, including overheads)

```
10 hours
```

General Description

We will use NACO with S27 and the Ks filter to image 5 fields each in
 the Quintuplet starburst cluster (using the dichroic N20C80) and in the Arches starburst
 cluster (using the N90C10 dichroic). The aim of the programme is to obtain high
 precision astrometry, which - when mapped against 2nd epoch data - will enable us
 to distinguish cluster members from field stars based on proper motions. For the
 central fields (#1), 1st epoch data are already available in the ESO archive. Here
 the dither pattern matches the 2st epoch data in order to minimize the effect of
 astrometric distorsions. For Fields 2 to 5, which will represent 1st epoch data,
 smaller dither offsets habe been selected in order to further optimize the determination
 of the astrometry. At the end of each OB, 5 dithered positions in a nearby, relatively
 empty "sky" field, will be obtained in open loop to facilitate dark and sky subtraction.
 5 dither positions for the sky are sufficient, as the observations of Quintuplet
 and Arches are crowding limited rather than sky limited.

For each field, one NGS has been identified, with the exception of Arches Field
 1, where 5 possible IR-NGS are identified. In case crowding should prevent a stable
 AO loop with R1, please use R2 instead (and so on).

Waiver Requests

A waiver request to extend the phase 2 deadline to Feb 18 has been submitted
 to and accepted by ESO

Critical Observing Condition Constraints

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N/A
```

Time-Critical Aspects

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N/A
```

Special Execution Requirements

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N/A
```

Special Calibration Information

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N/A
```

ToO Information

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N/A
```

ToO Activators List

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N/A
```

Is this a Pre-imaging run ?

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false
```

Pre-imaging Requirements

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N/A
```

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 ?

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N/A
```

Have you included OBs for any calibrations that you need but which are not part of the Calibration Plan ?

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N/A
```

If you are observing Moving Targets, have you attached suitable ephemeris files to your OBs?

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N/A
```

If you have preferences which OBs should be executed first, did you make use of the User Priority field in the OBs ?

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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 ?

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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 15:40:24 2009
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