71.C-0580(A)

PI:Littlefair/ Naylor/ Jeffries/ Burningham

71C0580A.html

Last update of this page: Wed Jun 11 17:45:13 2003
Last update of the USG file: May 6 15:50:11 2003

RA Range: 16.5h - one field

Constraint set (Typical seeing, Transparency,Airmass, FLI, Moon distance): 2.0 3THN 2.0 1.0 60

Pre-imaging run?	No!	Chilean run?	No!	Special calibrations?	No!
Time critical?	Yes!	ToO?	No!	Carry-over run?	No!

 
 
This program intends to measure the rotation rates of young stars
in the Rho Ophiuchus dark cloud. The rotation rates are measured
by searching for PERIODIC photometric variability (caused by
starspots) in these stars. As such, the timing of OB execution
is the critical parameter for the success of this program.

Please read the Time Critical Aspects of README section for more
information.

There is complicate program for Service Mode schedule. Please,
find below some more details about Time Critical Aspects which
appeared during the discussion with PI. I hope it will help:

>This is crucial for periods of 4 hours to 2 days. There are two issues for
>scheduling:
>
>1) Sampling period. You suggest that the sampling period would be 1.5
>hours at best. Also, you ask with what accuracy we should regard the
>request to observe "hourly".
>
>First, OBs executed every 1.5 hours is acceptable, but only just. I would
>not wish to exceed this value. Can you provide short spacings for one
>night, at least? If we could observe hourly for one night, and
>then at 1.5--2 hours for the remaining nights, our science would be
>unaffected. Perhaps this is schedulable.
>
>Second, how accurate should we regard "hourly". I have modelled some data
>and find that scatters of up to 15 minutes (some observations late, some
>early) are acceptable.
>
>2) What to do with cloudy nights. Four nights close together is not ideal.
>There is no solution other than to hope that we will get four usable
>nights in a row. We do not need photometric skies, so our chances are OK I
>hope! If one night is cloudy, then our science goals will suffer
>slightly, but there is nothing that can be done. Simply continue as normal
>the next night, and observe until we run out of OBs in the run.

PI included one Cal OB for the observation of dark frames for this run.
 
 

Run status page 71.C-0580A

README of this run:

71.C-0580A.README