README web version of /home/usg/OPS/MTS/readme_xml/readme_79034401

Principal Investigator Email Address

• David.Luz@obspm.fr

Estimated Total Execution Time (hours, including overheads)

• 7h19m

General Description

• General Overview
  ----------------
  
  This programme's objective is to characterize the wind speed in the Venus thermosphere,
   using the Doppler shift of the atomic oxygen green line at 5557 A, from the night
   side airglow. The slit is to be positioned parallel to the target's rotation axis,
   so as to extract spectra in the body's north-south direction. The slit is then offset
   in a series of exposures so as to cover the Venus nocturnal hemisphere in a series
   of positions: twice on the central meridian (to cover the northern and southern
   hemisphere), twice between the central meridian and night limb, and once close to
   the night limb.
  
  Since the Venus size is changing rapidly, the offsets of the OBs have been adjusted
   for the time interval of each OB in order to position the slit correctly.
  
  The OBs for the slit over the central meridian are to be executed later (as marked
   in Time Intervals) when it is in the night side. In the offsets we have accounted
   for the slightly larger size of the target.
  
  NOTES:
  ------
  Ephemerides for Venus are provided in file 079.C-0344B.004.eph.
  
  Since this is a Solar System target we are not submitting finding charts.

Waiver Requests

• One waiver request for OBs longer than 1 hour was submitted on 3 February
   2007 and was approved on 5 February (with the usual restriction that if the conditions
   degrade after the first hour the OB will not be repeated). The waiver ID is 079.C-0344B.01.
  
  Waiver requests for using templates UVES_red_obs_expfree UVES_red_cal_wavefree with
   decker height 25" were submitted on 6 February and approved on 7 February.

Critical Observing Condition Constraints

• Mostly Sky transparency Clear and seeing <1.0.
  In one of the OBs we request for photometric transparency for absolute flux calibration.
  
  This target is only visible about one hour each night in the period specified.

Time-Critical Aspects

• Preferred time frame for this run is 15-30 September 2008.

Special Execution Requirements

• IMPORTANT: The position angle for the derotator is provided in the attached
  ephemerides files. Please use it instead of the one provided in the OBs.
  
  Please use the velocities provided in the ephemerides file and make sure that the
   secondary guiding loop is closed properly; Due to the nature of the target, the
   night
  astronomer should check visually the slit centering in the Central Meridian OBs.
  
  Please include detailed comments in the night report file if the object drifts.

Special Calibration Information

• ThAr exposures included in submitted OBs.

ToO Information

• Not Applicable.

ToO Activators List

• Not Applicable.

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 ?

• YES

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 ?

• N/A

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 ?

• YES

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

• YES

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

• YES

If this is a run that requires coordinated observations with other facilities,
 did you give proper instructions in the Time-Critical Aspects Section ?

• YES

If you need secondary guiding, are there suitable objects within 30 arcsec
 from your target ?

• N/A