README web version of /home/usg/OPS/MTS/readme_xml/readme_76505700

Principal Investigator Email Address

• dotto@mporzio.astro.it

Estimated Total Execution Time (hours, including overheads)

• 9.975 (09:58:31.000)

General Description

• We will perform spectroscopy and photometry of Near Earth Asteroid 2004
   VD17, a non-zero probability Earth impactor.
  We plan to obtain a suitable light curve for achieving 2004 VD17 rotational period,
   as well as some constraints on the shape of the object. Target spectra will allow
   us to investigate for surface composition. 
  Solar analog stars will be observed to remove solar contribution to target spectra,
   and photometric standard stars are needed to carry out VBRI photometric calibration.

Waiver Requests

• WaiverID:  276.C-5057A.01
  
  We asked for continuous observing time sub-runs. Observations should be carried
   out in the first part of the night, on the following dates: 
  April, 30th
  May, 18th
  May, 20th
  May, 21st
  following given OBs sequence (see Time-Critical Aspects section)

Critical Observing Condition Constraints

• 2004 VD17 spectroscopic observations must be carrid out at airmass lower
   than 1.6. Solar analog stars have to be observed at the same airmass of the target.
   
  Photometric observations of target 2004 VD17 have to be carried out at airmass lower
   than 2.0.  Since asteroid 2004 VD17 is going to go down earlier and earlier, it's
   important to start our observations at the beginning of the night, just after astronomical
   sunset.
  
  Please check that target 2004 VD17 is far enough (not contaminated) from any field
   star, during the entire exposition.

Time-Critical Aspects

• OBs sequence (we need photometric standard stars to be taken just before
   and just after following sub-runs):
  
  30APR:
  MOV_2004VD17_7VR_30apr_1
  MOV_2004VD17_VBRIV_30apr_1
  MOV_2004VD17_spec_30apr_1
  MOV_2004VD17_spec_30apr_2
  MOV_2004VD17_spec_30apr_3
  solanalog_SA102_1081_30apr_1
  MOV_2004VD17_7VR_30apr_2
  MOV_2004VD17_spec_30apr_4
  MOV_2004VD17_spec_30apr_5
  MOV_2004VD17_spec_30apr_6
  solanalog_SA102_1081_30apr_2
  MOV_2004VD17_VBRIV_30apr_2
  MOV_2004VD17_10VR_30apr
  
  18MAY:
  MOV_2004VD17_VRIV_18mag
  MOV_2004VD17_spec_18mag_1
  MOV_2004VD17_spec_18mag_2
  MOV_2004VD17_spec_18mag_3
  solanalog_SA102_1081_18mag
  MOV_2004VD17_10VR_18mag_1
  MOV_2004VD17_10VR_18mag_2
  
  20MAY:
  MOV_2004VD17_VRIV_20mag
  MOV_2004VD17_spec_20mag_1
  MOV_2004VD17_spec_20mag_2
  MOV_2004VD17_spec_20mag_3
  solanalog_SA102_1081_20mag
  MOV_2004VD17_7VR_20mag_1
  MOV_2004VD17_7VR_20mag_2
  
  21MAY:
  MOV_2004VD17_VRIV_21mag
  MOV_2004VD17_spec_21mag_1
  MOV_2004VD17_spec_21mag_2
  MOV_2004VD17_spec_21mag_3
  solanalog_SA102_1081_21mag
  MOV_2004VD17_7VR_21mag
  MOV_2004VD17_6VR_21mag
  
  
  !We need photometric standard stars to be taken just before and just after these
   sub-runs

Special Execution Requirements

• Since 2004 VD17 is a very fast moving object, it's critical to check for
   accurate position, sky motion rates and slit orientation at the actual observation
   time (these informations are available in the attached ephemerides file). Overmore,
   it's quite difficult to provide you of an useful finder chart (even if you'll find
   some sample finding charts attached to OBs). So you should generate them through
   website http://asteroid.lowell.edu/cgi-bin/koehn/astfinder. You simply have to insert
   asteroid name (2004 VD17) and date/time of observation (and select La Silla Observatory,
   of course). North is plotted to the top of the chart and East is plotted to the
   left. An arrow will represent the one-hour change in position of the asteroid.
  If any problem arises you could also use DSS images (in this case, target is the
   missing object around center of image!)
  
  Since spectroscopic frames are preceded by many imaging frames, helpful for target
   identification, you don't need requested two pre-imaging OBs for accurate preset.
  
  For 2004 VD17 spectrum, we've calculated an exposure time of 30 minutes in order
   to reach a S/N > 30. Each spectrum has been splitted in three (10-minutes exposing)
   different OBs (MOV_2004VD17_spec) which must be executed consecutively.

Special Calibration Information

• Solar analogs (OB names: SA'number') have to be observed at the same airmass
   of target 2004 VD17. V magnitudes of these stars are provided in each OB (see user
   comments).
  
  We need photometric standard star observations all along the nights, at different
   airmasses.

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 ?

• 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 ?

• 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