README web version of /home/usg/OPS/MTS/readme_xml/readme_81077300

Principal Investigator Email Address

```
albrecht@strw.leidenuniv.nl
```

Estimated Total Execution Time (hours, including overheads)

```
6 h
```

General Description

As we are mainly interested in differential phase measurements 
thin cirrus clouds are acceptable for us during observations.

Alpha Cru consists of three components of which one is too faint to be
seen by AMBER. The two main components, which are observed in this
program, are separated by 3.9+-0.07arcsec and a position angle of
114+-1 deg (Davis and North 2001).

Gamma Cen is a double star system with two equally bright targets. The
two components are separated by 0.89+-0.02arcsec and a position angle
of 347 +-2 deg degrees (Davis and North 2001). The magnitudes given
in the OBs refer to the individual components. Therefore
they are lower than indicated for the whole system by e.g. Simbad.

The position for each component is indicated in its OB. 

Please note that the primary of Alpha Cru is included one time as a
science target in this program and three times it is used as the
calibrator.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
No Observing Condition Constraints
```

Time-Critical Aspects

```
No Time Critical Aspects
```

Special Execution Requirements

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Special Calibration Information

The calibrators used in this program and which are not in the CaliVin
 database are: Alf01 Cru and Delta Cen

Name:
Alf01 Cru         
Coordinates:
ra: 12:26:35.871 dec: -63:05:56.580
V magnitude:
1.5  
K magnitude:
1.3 
Spectral Type:
B0.5IV
Uniform Disk (UD) diameter at K, H, J bands with error estimate:
K:  0.61+- [mas] 
H:  0.61+- [masJ
J:  0.61+- [mas] 
Source of diameter estimate:
Catalogue of Stellar Diameters (CADARS) (Pasinetti-Fracassini+ 2001) Method: Wesselink

*********************************************************************
Name:
Delta Cen         
Coordinates:
 ra: 12 08 21.500	dec:-50 43 20.730
V magnitude:
2.6  
K magnitude:
2.8 
Spectral Type:
B2IVne
Uniform Disk (UD) diameter at K, H, J bands with error estimate:
K:  0.52+- [mas] 
H:  0.52+- [masJ
J:  0.52+- [mas] 
Source of diameter estimate:
Catalogue of Stellar Diameters (CADARS) (Pasinetti-Fracassini+ 2001) Method: Wesselink

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 ?

```
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 ?

```
N/A
```

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 15:40:25 2009
If you have comments, please contact usd-help@eso.org