README web version of /home/usg/OPS/MTS/readme_xml/readme_75048401

Principal Investigator Email Address

```
mvannier@eso.org
```

Estimated Total Execution Time (hours, including overheads)

30mn per OB, i.e. 1 hour per calibrated visibility point, 4 hours in total

General Description

In this run, we propose to use MIDI for probing the dust distribution
 of R Aqr at a scale of a few tens of milliarcsecond. MIDI will allow to compare
 the inner distribution and sizes of the dust (in particular the silicate features,
 9-11 microns) and IR continuum regions.
 
In order to measure some asymmetry in the inner structures, the observations should
 fill-in the spatial coverage of these objects in 4 directions directions, ideally
 separated by roughly 3 hours (45 deg). I realize that this might be difficult to
 fulfill, and a larger time span has been given in the time-critical constraints
 for the earliest and latest OBs.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
Clear Sky, no particular constraints.
```

Time-Critical Aspects

The science object and its calibrator are observed 4 times, with ideally
 a baseline rotation of 45 degrees (i.e. 3 hours in time) between them. These observations
 do not need to be done within the same night. 

This would impose very low elevation for the earliest and the latest OBs ; if observed
 in september, R Aqr would have an elevation of about 30-35 degrees if observed at
 the ideal sideral times (19:15 for the earliest and 04:15 for the lastest). This
 is probably too low thus I let some flexibility for these OBs, but the closest to
 these times, the better.

Special Execution Requirements

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Special Calibration Information

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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 ?

```
N/A
```

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 'User Comments' field ?

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
```

Last creation of page: Tue Oct 6 15:40:07 2009
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