README web version of /home/usg/OPS/MTS/readme_xml/readme_79090800

Principal Investigator Email Address

```
gchauvin@eso.org
```

Estimated Total Execution Time (hours, including overheads)

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12:00
```

General Description

Simple Astrometric Coronographic observation using the C_0.7 masks in
 Ks with S27 and S13 cameras. 

The purpose of this program is to conduct follow-up observations of very faint companion
 candidates detected around 10 bright stars during previous observing campaigns with
 VLT/NACO and HST/NICMOS. In all cases, the gap between the first epoch of observations
 and the period 79 is >1.5 yrs.  The proper motion of all 10 stars is large enough
 to verify, unambiguously, whether the candidates are true comoving companions or
 stationary background objects.

All stars are their own AO reference star.

To complete this program, we are using a coronographic OB dedicated to astrometric
 observations.
 This OB is composed of :
1- ACQ: place the bright star behind the mask (Ks + ND).
2- OBS: coronographic observations without offsetting the star in Ks
3- OBS: classical imaging observation in Ks+ND, where the first offset positions
 will give us the star position behind the mask
4- OBS: coronographic observations of the sky in Ks

A special astrometric binary must be observed ONE WEEK before/after each science
 object except TYC9012_coro_Ks. 

Special calibrations are also required in daytime to measure the filters shift between
 Ks+Neutral Density and Ks, using the same CONICA observing set-up and CONICA pinholes
 with the calibration lamp.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

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none
```

Time-Critical Aspects

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none
```

Special Execution Requirements

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none
```

Special Calibration Information

A special astrometric calibrator must be observed within ONE WEEK for
 each science object.

Special daytime calibrations is also required in daytime to measure the filters
 shift between Ks+Neutral Density and Ks with S27 or S13 depending on the camera
 used. This can be done using the same CONICA observing set-up and CONICA pinholes
 with the calibration lamp.

ToO Information

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none
```

ToO Activators List

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none
```

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

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none
```

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 ?

```
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 ?

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 15:40:20 2009
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