Re: Working on Data

["Thomas Droege" <tdroege2@earthlink.net>]

I hope that any correction will be made by looking at the data on a single
frame or a night of frames and computing a correction.  It this is due to
say a lens with cocked elements, then I might fix it at some time in the
future.  Any correction should fix itself when such a thing is done.???  

Tom Droege


> [Original Message]
> From: Stupendous Man <richmond@a188-l009.rit.edu>
> To: <tass@listserv.wwa.com>; <tdroege2@earthlink.net>
> Cc: <mwrsps@rit.edu>
> Date: 7/12/2003 4:39:47 PM
> Subject: Re: Working on Data
>
>
> > Michael, if you work out a fix for this, will it require rerunning all
the 
> > data?
>
>   Nope.  The fix can be done with the information in the .cal files
> from each night, as long as the associated .list files are present
> as well.  There's no need to go back to the images.
>
>   Removing the obvious spatial error in V-band reduces the scatter
> in (Tycho Vt - TASS V) by something like 15 to 30 percent.
> I'd call it worthwhile.  
>
>   Arne wrote:
>
> > I was able to use the 1.3m two nights ago and got 4x2degree
> > swaths of the 16hr SDSS calibration field, plus about 2x2degrees
> > in another calibration field ("O") at 21hrs. 
>
>   Hmmm.  The data I've been using to test this correction comes
> from 5 CD-Roms Tom mailed me.  It _does_ include the region 
> around RA = 16 hours, but there's nothing in it around RA = 21 hours.
> Still, the 16-hour field will help a lot as I try to go from 
> our intermediate Tycho2 system to the Johnson-Cousins system.
>
>                                    Michael