README web version of /home/usg/OPS/MTS/readme_xml/readme_77502101

Principal Investigator Email Address

• ejehin@eso.org

Estimated Total Execution Time (hours, including overheads)

• 2h10

General Description

• This DDT ToO is the continuation of DDT 277.C-5009 whose goal is to take
  FORS (BVR) images of the fragments of split comet SW-3 while passing close to perihelion.
  
  Run(A) is for the dark time period June01-10 (4 OBs)
  Run(B) is for the dark time period June23-July10 (4 OBs)
  
  For each run there are 4 OBs of 30 minutes to do simple BVR images. 
  The observing strategy (exptime, filter) could change depending of the comets behaviour.
    
  Each observation will be triggered as ToO and the precise ephemeris provided at
   that time.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• seeing needs to be raisonably good.

Time-Critical Aspects

• The comet is only visible the last 2 hours of the night.
  15 min of twilight can be used without problem (the airmass is even lower)!
  
  run(A) is meant to be executed from June01-10
  run(B) is meant to be executed from Jun23-July10 (but could be executed earlier
   if B or C fragment is undergoing complete desintegration)

Special Execution Requirements

• 1) 
  
  As our targets are moving objects, the following quantities need to be updated in
   the OB before execution :
  
  -the precise coordinates (those in the OBs are just indicative)
  under the columns : R.A._(ICRF/J2000.0) and _DEC
  
  The fragments are bright and will be easy to identify.
  If you dont see the comet, please look again the ephemeris, especially the UT date.
  
  -the additional tracking velocities 
  under the columns : dRA*cosD and d(DEC)/dt
  
  
  2)
  - Choice of Guide Star : The comet is a relatively fast moving object (2 arcmin
   in 30 minutes). The guide star will need to be chosen carrefully (not too close
   to the an edge of the field, or not right in front of the comet movement (to avoid
   guide probe is going into the field).
  Slight vigneting is no problem.
  
  3) 
  Please rapidly check each image :
  - to see that the comet is in the field (a typo in the coord is easily done!)
  - to see if the stars are trailed uniformely (the comet should not be trailed).
   A problem here could be the diff tracking velocities. If we are lucky you should
   see mini comets around !
  - check that no very bright star is crossing the comet area ! Sometimes we could
   be unlucky but this is rare. If this is happening please repeat the exposure.

Special Calibration Information

• none

ToO Information

• This is a ToO program

ToO Activators List

• ejehin@eso.org
  ohainaut@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 FORS1 Phase 2 web page ?

• N/A