README web version of /home/usg/OPS/MTS/readme_xml/readme_79034400

Principal Investigator Email Address

• David.Luz@obspm.fr

Estimated Total Execution Time (hours, including overheads)

• 11.5

General Description

• General Overview
  ----------------
  
  This programme's objective is to characterize the wind speed in the Venus mesosphere
   from high resolution Doppler velocimetry. By using the derotator to adjust the slit
   orientation, and offsetting the slit, it is possible to map the winds over the Venus
   dayside using the large range of wavelengths provided by the instrument.
  
  In the "perpendicular" configuration the slit is positioned perpendicularly to the
   target's rotation axis, so as to extract spectra in the body's east-west direction.
   The slit is then offset in a series of exposures so as to cover the Venus disk from
   the northern high latitudes to the southern ones. This procedure is to be done twice,
   with instrument configurations RED-580 and DIC2 437+860nm, one after the other,
   i.e., MOV_Venus_day_Per_RED and MOV_Venus_day_Per_DIC.
  
  Similarly, in the "parallel" configuration the slit is positioned parallel to the
   central meridian and RED and DIC2 modes are executed consecutively (MOV_Venus_day_Par_RED
   and MOV_Venus_day_Par_DIC).
  
  
  NOTES:
  ------
  Notation: in OB names, N1-1 and N1-2 means night 1, OB1 and night 1, OB2; N2 means
   night 2, N3 means night 3, etc. "Par" means slit parallel to the Venus rotation
   axis and "Per" means slit perpendicular to the axis.
  
  Ephemerides are provided in files 079.C-0344A.004.eph and 079.C-0344A.par4.eph which
   are attached to their respective OBs.
  
  Since this is a Solar System target we are not submitting finding charts.
  
  Note added 25 May:
  If the acquisition image saturates, perhaps the night astronomer could replace the
   ND3 filter specified with ND4 or ND5.

Waiver Requests

• Waiver requests for using templates UVES_red_obs_expfree, UVES_cal_wavefree,
   UVES_dic2_obs_expfree and UVES_dic2_cal_wavefree to be used with decker height 20"
   were submitted on 6 February 2007 and approved on 7 February.

Critical Observing Condition Constraints

• Sky transparency CLEAR and seeing < 1.2.
  
  Ideally, the airmass should be less than 3, but since this target is only visible
   with airmass<3 about 1h each night in the period specified we have relaxed the
   airmass constraint to 4.0.

Time-Critical Aspects

• Not Applicable

Special Execution Requirements

• Please make sure that order 70 (8646-8788 A) of the MIT CCD is not saturated
   in the DIC2 OBs, as this would compromise the observation of the 5nu3 CO2 absorption
   band. If that is the case the night astronomer could try to reduce the exposure
   time.
  
  The consecutive execution of OBs Red and DIC2 is particularly difficult due to the
   limited period of observability of Venus in each night. When executing the RED and
   DIC2 OBs consecutively, the night astronomer may set the telescope preset to "False"
   in the second OB in order to save time (keeping the target in the same position
   within the slit, within the guiding accuracy).
  
  We have provided fine differential motions in the attached ephemerides files.
  
  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.

Special Calibration Information

• ThAr exposures included in OBs.
  
  FF Calibration blocks are submitted separately.

ToO Information

• Not Applicable.

ToO Activators List

• Not Applicable.

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• No requirements.

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