README web version of /home/usg/OPS/MTS/readme_xml/readme_76503203

Principal Investigator Email Address

• hmeng@pku.edu.cn

Estimated Total Execution Time (hours, including overheads)

• 1.000

General Description

• At July 2 (night of July 1/2), UT 05h 12.0m and 05h 47.5m, there will
   be two close appulses of asteroid 2003 EH1, which is an extinct comet candidate,
   with stars 2UCAC 24710770 and 2UCAC 24710762. The dust survived within the circum-nuclear
   space of this extinct comet, if exists, may cause some photometric variations on
   the background stars. This program is just designed for monitoring such effect.
  
  So,
  1). The targets of interest of this observation are the two stars, not the asteroid.
   In the entire observing time, the telescope should only focus at the point in the
   middle of the two stars (coordinate given in the OB), with no offset.
  2). The asteroid should also be captured to see its actual position for determining
   the brightness and miss distances. Because the asteroid will be in the same field
   of view during the entire observing time, and move slow enough, long exposures of
   the stars (50s in the OB) with no offest and no special guide is OK for detecting
   it.
  3). Some exposures are time-critical, as described in "Time-Critical Aspects".
  4). High time resolution is desired, as described in "Special Execution Requirements".
  5). More flat fields are needed for photometric precision, as described in "Special
   Calibration Information".
  
  NOTE: All the times provided are UT, NOT Chillean or Paranal local time!!!
  
  For urgent problems, please call me at (+86) 1314 616 7505 (Cell, H. Meng, 24h available
   everyday).

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• No observing condition constraint. The observation should be performed
   only if the least condition of the observatory allowing.

Time-Critical Aspects

• 1). The OB should be started time-critically at July 2, UT 04h 57m (night
   of July 1/2). If the start time has to be postponed for some reason, after necessary
   acquisition, please skip the missed exposures and still follow the schedule for
   absolute time. (The schedule of absolute time can be calculated from the relative
   time from the OB, with the start point at UT 04h 57m).
  2). The appulse time is UT 05h 12.0m and 47.5m. So, for high time resolution, the
   period from 05h 05m to 05h 55m must be covered by the short (3s) exposures with
   Bessell B filter as frequently as possible.
  3). Short exposures are for the stars, while the long (50s) ones are for the asteroid.
   Only three long exposures are planned (also with Bessel B filter). The 1st and 3rd
   ones should be at the beginning and end of the total time (except acquisition) respectively.
   But the 2nd long exposure should be taken time-critically in the middle of the two
   appulse times, i.e. about UT 05h 29m.
  
  NOTE: All the times provided are UT, NOT Chillean or Paranal local time!!!

Special Execution Requirements

• For the short (3s) exposures, high time resolution is extremely important.
   In the OB, we have planned 27 short exposures before the 2nd long (50s) exposure,
   and also 27 after that. (Note the 2nd long exposure is time-critical!) However,
   if time permitting, please ignore these appointed numbers and take as more SHORT
   exposures as possible. The only principle is ensuring the three time-critical long
   exposures.

Special Calibration Information

• At least 20 frames of the Imaging Sky Flats in High Resolution are needed
   for our photometric precision. 4 such flat fields can be provided by the Calibration
   Plan, and others need to be additionally captured in twillight. If the residual
   number (at least 16) is still too high, please take as more as possible if condition
   permitting.

ToO Information

• DDT ToO program

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 ?

• YES

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 ?

• YES

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 have prepared your finding charts with tools other than FIMS,
 do they comply with the specifications on the FORS1 Phase 2 web page ?

• YES