README web version of /home/usg/OPS/MTS/readme_xml/readme_82502100

Principal Investigator Email Address

```
lippi@mps.mpg.de
```

Estimated Total Execution Time (hours, including overheads)

```
8h 1min
```

General Description

Science program on a moving target
==================================

---------------------------------------------------------------
Please communicate about this program to: lippi@mps.mpg.de
---------------------------------------------------------------


SCIENCE PROGRAM: Search for Deuterated Water in comet C/2007 N3 Lulin, using 2 different
 wavelength settings.


PRIORITY: 2 priority levels for the comet and standard star OBs are defined.


OBJECT INFORMATION: C/2007 N3 Lulin is a MOVING TARGET.
The comet RA/DEC changes from 15h13m/-17d in early February to 06h53/+22d in late
 March 2008, the total
brightness of the comet is expected to be between 4 and 5 mag.
The comet is visible in the second half of the night and the nightly visibility
 window increase from 2h in 
early February to 6h and a half in mid-late February, and then decrease again to
 2h in the end of March.
The exact position and tracking rates for the comet for the respective observing
 epochs are to be taken 
from the attached ephemeris. Tracking rate of the comet changes during OB execution
 time. Thus adjustment
of telescope tracking during OB execution is strongly suggested, typically every
 10 min.

AO INFORMATION: Please try to close AO loop on the central brightness peak in the
 coma. Any AO support 
will improve the SNR in the comet spectra.
IF THE AO LOOP CANNOT BE CLOSED, PLEASE RUN THE OB IN OPEN LOOP AND PROVIDE US WITH
 A BRIEF IMMEDIATE
FEEDBACK. In case the AO loop cannot be close, we intend to modify the OBs for non-AO
 observations.

OBSERVING STRATEGY: Please perform the OBs according to user priority. It may not
 be possible to execute
many OBs per night. If the program has to be split over several nights, ideally
 they should be not so 
far apart from eachother.

CALIBRATIONS: Apart from the usual calibration data according to the CRIRES calibration
 plan, we ask for
observations of a flux standard star: BS4133. This star should be measured with
 0.8 arcsec slit. 
An important requirement is that the CAL OBs are performed for CLR sky conditions
 at high airmass.
Please, IF ONE OR MORE SCIENCE OBS ARE EXECUTED DURING A NIGHT, TRY TO EXECUTE A
 STANDARD STAR OBSERVATION 
AS WELL.
Flux star: BS4133: B1Ib V=3.85 mag, L=4.27 mag, SNR=80.
Moreover we ask for specific flats and darks (daytime calibration): the flat frames
 should be taken with
the same slit width of the OBs (i.e. 0.4 for the comet and 0.8 for the star), and
 the dark frames should 
have the same total integration time of the flat frames.

EPHEMERIS FILE: The ephemeris provides in (5min) time steps for the daily visiblity
 window of the comet
at Paranal
* RA and DEC (hh mm ss.ss, sdd mm ss.s)
* velocities in RA and DEC (arcsec/s)
* airmass
* total vis. brightness (mag)
* distance comet-moon (deg)
* moon phase (%)

Cook instructions for OB execution:
===================================
- select OB according to user priority
- check requirement for environmental conditions (CLR, moon phase/distance)
- in OB enter RA and DEC from target ephemeris (fields RA and DEC) that are
closest in time to the expected start time of the OB
- in OB enter differential velocity in RA and DEC (fields dRA*cosD and dDEC/dt)
from target ephemeris that are closest in time to the expected start
time of the OB
- perform preset, AO and slit acquisition, if AO cannot be close, work in open loop
- perform spectroscopy
- check whether flux calibration OB is executed, if not try to get it done as well

Waiver Requests

Free wavelength settings.

Use of a 0.8" slit width for the Standard star observation.

No finding Charts are attached since both the targets are quite bright.

All the waiver requests are granted.

Critical Observing Condition Constraints

```
Clear sky at high airmass is required.
```

Time-Critical Aspects

During the period from the 1st to the 22nd of February 2009, there is
 a good combination of brightness,
Figure of Merit (FOM), Doppler shift and visibility for our target. 
In particular, the period between the 18th and the 22nd of February is the best
 suitable for 
the success of our scientific goal.

From the 26th of February to the 20th March 2009 we still have acceptable combination
 of brightness, FOM,
Doppler shift and visibility for the target.

NOTE that from the 23rd to the 25th of February the Doppler shift is too small to
 permit to distinguish 
between comet emission lines and atmospheric lines, i.e. to permit to observe emission
 lines from the 
comet, and thus to permit to us to reach our scientific goal.

Special Execution Requirements

---(Empty)---

Special Calibration Information

Flux calibration OB must be executed at least once at similar sky conditions
 (CLR at high airmass).

Flat frames should have the same slit width of the executed OBs (0.4" for the comet,
 0.8" for the 
standard star).

Dark frames should have the same total integration time of the flats.

ToO Information

```
This is not a ToO program
```

ToO Activators List

```
This is not a ToO program
```

Do the README file and the instrument comments of the telluric stars OBs include the required S/N/pixel of the spectrum of the telluric star, its spectral type and allowed spectral range?

Do any OBs include wavelength or flatfield calibrations?

If you are observing Moving Targets, have you attached suitable ephemeris files to your OBs?

If the slit viewer guide star is different from the target, are the RA and DEC offsets accurate to within 0.05 arcsec and do they take into account the relative proper motion between the two objects?

```
N/A
```

If you have preferences which OBs should be executed first for objects at similar RA, did you make use of the User Priority field in the OBs?

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