README web version of /home/usg/OPS/MTS/readme_xml/readme_80011200

Principal Investigator Email Address

```
arichich@eso.org
```

Estimated Total Execution Time (hours, including overheads)

```
3.0
```

General Description

The target TX Psc is a carbon star, V is variable up to 5mag, K~0.8.
We aim at measuring the angular diameter (and its changes with time)
and the immediate circumstellar environment. From a previous run,
we have seen that the visibilities on UT1-2-3 are below 10%, or
even 5%. From this, we estimate a fringe visibility of order
0.3-0.5 on the AT baselines assigned.

The standard star Tet Psc (=SAO 128196) is included in Calvin.
Its spectral type is K1III, magnitudes V=4.3, K=1.8. The
angular diameter should be 1.95mas, giving an expected
visibility close to 1 on the ATs (correlated magnitude
unchanged from the one above). The uncorrelated magnitude of
the calibrator in K band is over two magnitudes fainter than
the source, however the correlated magnitudes of source and
calibrator are expected to be similar within one mag.

The two OBs are equivalent, and they should simply be executed
at different LST (i.e. different baseline projections and
position angles), if possible. This is not a strict requirement
so it was not defined in the LST constraints (and it will happen 
in any case automatically if the two observations take place in 
the same night.)

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

None beyon the seeing and transparency stated in the OBs

Time-Critical Aspects

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None
```

Special Execution Requirements

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None
```

Special Calibration Information

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None
```

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

---(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 ?

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 15:40:20 2009
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