README web version of /home/usg/OPS/MTS/readme_xml/readme_76503000

Principal Investigator Email Address

• delbo@to.astro.it

Estimated Total Execution Time (hours, including overheads)

• 0.83

General Description

• This project aims at performing polarimetric measurements in V light of
   the potentially hazardous asteroid 99942 Apophis during the most favorable observing
   conditions in Feb-Mar 2006.
  
  We plan to measure the degree of polarization of the light reflected by the
  asteroid at three different phase angles (Run A, B, and C).
  We do this using the MOV_99942_IPOL OB.
  
  Moreover we obatin measurments of the Vband magnitude of the object, by means
  of the MOV_99942_V1 and MOV_99942_V2 OBs. Since we execute MOV_99942_V1 before
  and MOV_99942_V2 after MOV_99942_IPOL, we can correct polarimetric measurments
  for possible ligthcurve effects.
  
  We will use the phase-polarization curve obtained from the prosed FORS1 measurements
  to derive a reliable albedo which, when combined with the apparent magnitude
  and known distance of the object, will lead immediately to a determination
  of the size.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Please put in additional RA and DEC velocities as obatined/computed from
  the ephemerides files, in order to track the asteroid.
  
  Please do not observe the target when in front of, or very near by a star of
  comparable brightness.

Time-Critical Aspects

• Run A: As high priority we would like to have run A scheduled on
  Feb 1 or 2 or 8.
  If it was not possible to obtain observations of the target during this high
  priority time interval, run A can still be scheduled from Feb 10 to Feb 15. However,
   during this second period of time, our target will be 90 deg from the full moon
   and the polarization of the sky background will probably be non negligible.

Special Execution Requirements

• Please, extecute the OBs in the following order.
  1. MOV_99942_V1 (V band science Imaginig)
  2. MOV_99942_IPOL (V band science Imaginig polarimetry, 4 position of the retarder
   plate)
  3. MOV_99942_V2 (V band science Imaginig)

Special Calibration Information

• ---(Empty)---

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

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 ?

• YES

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?

• 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 ?

• 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 ?

• YES