Adding in sidereal time to image headers

massey

I'm just back from a Magellan run, and discovered to my chagrin that my headers all have a bogus value for the sidereal time. Everything else is fine, including the airmass, UT time, date, etc. I actually discovered this after running setjd and doslit, and somewhere along the line some IRAF task recomputed the airmasses based on my bogus sidereal times, with the result that my airmasses are now wacky as well.

Given that I know the longitude, time, and data, it should be possible to put valid sidereal time values into my headers, and then run setairmass. I've gotten as far as determining that either astedit or astcalc might be able to do this, but I confess that after multiple readings of the help pages, I'm still scratching my head.

Any additional guidance would be greatly appreciated.
cheers,
phil

fitz · Posted: Wed Dec 31, 2008 10:22 pm Post subject:

Hi Phil,

ASTHEDIT is probably the task you need, specifically the 'mst' function will help: Create a command file called 'cmd' that contains the following

massey · Posted: Sun Jan 11, 2009 5:20 pm Post subject:

Mike---this is great. THANK YOU!

---phil

AnTaR3s · Active IRAF User Joined: 24 Oct 2009 Posts: 56

Just in case anyone encountered the same problem as I have: