README web version of /home/usg/OPS/MTS/readme_xml/readme_77501601

Principal Investigator Email Address

• ejehin@eso.org

Estimated Total Execution Time (hours, including overheads)

• 1h10

General Description

• The goal of the run (B) is to obtain low resolution spectra of the main
   fragments of comet SW-3 with FORS2 in LSS mode.
  
  The ToO will be triggered either in parallel to UVES observations or when the comet
   is in outburst or displays some interesting features (sometime before June 20).
  
  - Precise coordinates (RA and DEC), 
  - Differential tracking rates (RA and DEC),
  - And the position angle (PsAng=-ROT A)  
  must be updated for each observation before starting the OBs (see execution requirements),
   using the ephemeris which will be sent with the activation.
  
  We have only provided one OB with grism 600B. It will be repeated to complete the
   1h total time. It is expected to be executed 2x 35 min.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• none

Time-Critical Aspects

• - The coords need to be filled at the precise time 2 min of the preset
   because it is a very fast moving object.
  
  - The comet is only visible at the end of the night during about 2 hours. 15 minutes
   of twilight can be used without problem (airmass is even lower)

Special Execution Requirements

• - Choice of Guide Star : The comet is a fast moving object : 5 arcmin
   in 1h. The guide star will need to be chosen carrefully to avoid to change the GS
   during the OB.
  
  - As our targets are moving objects, the following quantities need to be updated
   in the OB before execution :
  
  1) the precise coordinates (those in the OBs are just indicative)
  under the columns : R.A._(ICRF/J2000.0) and _DEC
  
  The 2 fragments are bright (V = 12 mag) and will be easy to identify.
  If you dont see the comet, please look again the ephemeris, especially the UT date.
  
  2) the additional tracking velocities 
  under the columns : dRA*cosD and d(DEC)/dt
  
  If the comet is moving with respect to the slit during the exposure, 
  this means that the diff. tracking was not properly set ! Please look again the
  ephemeris, especially the UT date.
  
  3) the Position Angle (to have the slit along or perpandicular the comet tail)
  under the column : PsAng (given in degrees and measured from N-->E)
  ROT = - PA 
  
  These quantities are to be taken from the - 1 min steps- ephemeris that will be
   sent during the acquisition.

Special Calibration Information

• ---(Empty)---

ToO Information

• These ToO observations will be triggered during UVES observations or an
   outburst of the comet (between May 25/ June 20). The ephemeris will be sent at that
   time."

ToO Activators List

• Jehin Emmanuel (ejehin@eso.org)

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

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 ?

• 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 FORS2 Phase 2 web page ?

• N/A