RA Range: 20:40 (science, 1st solar analog), 23:42 (2nd solar analog)

Constraint set (Typical seeing, Transparency,Airmass, FLI, Moon distance): 0.8 2CLR 1.7 0.4 30.

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

 
 

After the failed acquisition on Nov 5th the user has extended the
acquisition exposure time to 300s. This figure was computed based on
the actual FORS1 acquisition image, so it should work fine. Updated
ephemeris for the allowed nights provided.

The programme now is *really* time critical, as the only nights left
are those of Nov 22nd, 26th and 30th, and just a few hours per night
(see below).

HR LSS of Proteus, one of Neptune's satellites. The observations
are challenging because the target is faint (V=20.3) and within
5.5 arcsec of the bright (V=8) and extended (2'' diametery) planet.
In addition, Neptune moves with respect of the background stars
and Proteus moves with respect to it. Ideally, all three science
OBs should be executed in a sequence.


SPECIAL CALIBRATIONS: OBs for two solar analogs provided. Both
stars should be observed every night in which a science OB is
done, but not necessarily contiguously to science (six OBs provided
to covere the potential three nights of science).


TIME CRITICAL: the observations can now be carried out *only* on parts
of the nights of Nov 22nd, 26th and 30th. The ephemeris are provided
*only* for the allowed dates.


MOVING TARGET: RA, DEC, differential tracking velocity and rotator
angle from the provided ephemeris need to be inserted in the OB
at execution time.


ACQUISITION: the ephemeris are not accurate enough to allow to acquire
on Neptune and then perform a blind offset to Proteus. After some
discussion, which included TSz, it was decided that the best
thing is to acquire directly on the target. So:

      -the acquisition image is taken far in the red to
minimize the contrast between Proteus and Neptune which will
still be heavily saturated;

       -the ephemeris file gives, for every entry, the expected
offsets in arcsec of Proteus wrt Neptune. This is intended to make
its identification easier;

       -FCs are provided with the position of Neptune wrt the
background stars. Several charts are provided for different epochs.
This is intended to show the position of the background stars and
not to mistake one of them for the target.


 

Run status page 70.C-0097A

README of this run:

70.C-0097A.README