README web version of /home/usg/OPS/MTS/readme_xml/readme_82506600

Principal Investigator Email Address

```
mischa@astro.uni-bonn.de
```

Estimated Total Execution Time (hours, including overheads)

```
0.6
```

General Description

This observation aims to determine the exact redshifts of a bright (mag
 ~18) elliptical galaxy and a fainter nearby lensed arc (mag 22.5). The redshift
 of the elliptical is approximately 0.25, the redshift of the arc can be anywhere
 between 0.5 and 1.5.

A 1" wide long slit is used to cover both the elliptical galaxy and the arc. The
 elliptical should be easily visible in a 30 second through-slit exposure. The arc
 will be in the slit as well for a slit position angle of 56.89 degrees. Two exposures
 of 600s are made, through the 300I grism.

The moon should ideally be illuminated 50% or less, and more than 60 degrees away
 from the target in grey conditions.

The target is visible for about 1h at the beginning of the night.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

The target should be observed in a seeing of not greater than 1.0 arcseconds.
 The moon should not be illuminated more than 50%. In grey time, the moon should
 be more than 60 degrees away from the source. The maximum airmass is 1.9.

Time-Critical Aspects

The target is visible until march 30 2009. After that, the moon distance
 will be too small, and and after that the general visibility period ends.

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 ?

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
```

If you have prepared your finding charts with tools other than FIMS, do they comply with the specifications on the FORS1 Phase 2 web page ?

Last creation of page: Tue Oct 6 15:40:28 2009
If you have comments, please contact usd-help@eso.org