Check Telescope Pointing by taking a Lucifer Science Image and running ptcorr
Jan. 2011: At the beginning of the night, the Operator will go to a star near your first target and tune up pointing and collimation, so you don't have to do this.
1. Find a pointing star.
In telescope Control gui,
Click on LOAD CATALOGUE
LOAD TARGET FILE
This brings up another gui, Look in
Select a star near your first target. Unfortunately, it does not do this for you.
2. Go to the Pointing Star
Click SET TARGET
SET GUIDE STAR
(we won't be guiding)
Rot-Mode = Parllactic
Tel-Mode = track Set Telescope Commit Telescope Set Up --> This MOVES THE TELESCOPE TO THE SELECTED STAR.
3. Manually take a short (2 second) image
FW1 = BR gam
FW2 = CLEAR
COMMIT INSTRUMENT SETUP
in New read out setup gui:
DIT = 2 sec then hit SET NEW VALUES
4. Go over to the NX-Observer machine and look at the image in SKYCAT
Click on the NX-Observer box
at the bottom of the Sun screen. This takes you to the Lucifer Computer
To return to the obs2 computer,
put the cursor in the upper right hand corner of the right hand monitor and CLICK.
The image you just took should show up in the SKYCAT window. Note the number of the fits file
5. Go back to obs2 and run ptcorr in IRAF.
lauch iraf by going into shell and saying cl.
and make sure UTDATE
is today's date, e.g. 20100107
ptcorr <Fits file number>
The image will appear in DS9.
Zoom to locate pointing star.
on the image of the star, and delete the green region circle
that you create.
This should send CA and IE corrections to the telescope.
It will try to centroid on the star, and failing that, take your cursor position, compute an offset and send
the offset to the telescope.
J. Bechtold, F. Bian E. McLinden