README web version of /home/usg/OPS/MTS/readme_xml/readme_81084100

Principal Investigator Email Address

```
skraus@mpifr-bonn.mpg.de
```

Estimated Total Execution Time (hours, including overheads)

```
1
```

General Description

This programme aims to measure the geometry and composition of the circumstellar
 disk around the Herbig Be star HD98922 using VLTI/MIDI.
In order to properly sample the radial disk structure, we require observations with
 the four AT baselines E0-G0, G0-H0, E0-H0, and D0-H0 at similar hour angles.
In addition, two observations at a very different hour angle are required to probe
 also asymmetries within the disk.

Earlier MIDI-UT observations have shown that the object can be properly resolved
 with VLTI/MIDI.
The new AT observations will add information at short baseline lengths.

If possible, we recommend to use the calibrator HD101104 (UD=6.06 mas, selected
 with ASPRO), which has a similar right ascension as HD98922.
For the case that calibrators at significantly earlier or later RA are required,
 we have prepared also OBs for the calibrators HD89388 (UD=5.30 mas, selected with
 ASPRO) and HD123139 (UD=5.25 mas).

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
None.
```

Time-Critical Aspects

```
None.
```

Special Execution Requirements

```
None.
```

Special Calibration Information

```
None.
```

ToO Information

```
None.
```

ToO Activators List

```
None.
```

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

```
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 ?

```
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 ?

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 ?

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