README web version of /home/usg/OPS/MTS/readme_xml/readme_83065700

Principal Investigator Email Address

```
dreizler@astro.physik.uni-goettingen.de
```

Estimated Total Execution Time (hours, including overheads)

```
2.3h
```

General Description

This programme aims in absolute photometry of a faint background object
 
in the vicinity (sep. ~ 20\", PA ~ 144deg) of Fomalhaut, a bright A4V 
star (VRIJHK~1.2mag). Fomalhaut is the only object that bright within 
several degrees. As a calibrator for the off-axis strehl ratio, a nearby
but similar system (eps PsA) was chosen. 

In both cases, the pointing of the S27 camera is offset from Fomalhaut and
eps PsA, respectively. Hence, the bright stars will not fall into the FOV. 
No risk of saturation, even from the seeing limited PSF halo after 60s DIT.

eps PsA has to be observed right before or after Fomalhaut in the same filter.
Hence, two independent sequences should be executed:
(1) Fomalhaut and eps PsA in H band
(2) Fomalhaut and eps PsA in Ks band

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
See time critical aspects!
```

Time-Critical Aspects

It has to be avoided that the diffraction spiders of the telescope cross
 the region where we want 
to find the background object (sep. ~ 20\", PA ~ 144deg from Fomalhaut), see finding
 chart.
Hence observations of Fomalhaut within 45min before or after meridian passage (HA
 = -0h:45m...+0h:45m)
are not acceptable, since during meridian passage the diffraction spikes cross the
 target position 
twice. This leaves nearly 2h before (HA = -2h:30..-0h:45m) and 2h after meridian
 passage (HA = +0h:45..+2h:30m), 
before airmass 1.2 is reached (constraint set).

Special Execution Requirements

The OB for eps PsA has to be observed right before or after Fomalhaut
 in the same filter.
See also time critical aspects for when the OBs can be executed as a function of
 HA.

Special Calibration Information

```
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 ?

```
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?

```
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 15:40:30 2009
If you have comments, please contact usd-help@eso.org