RE: Disk Set 20: dates and times

["Michael Gutzwiller" <deepsky@fuse.net>]

I'd say go ahead and change the program to give the right file names but
don't bother going back to fix the old file names now.  It's not critical to
the analysis as long as the correct time and date is stored in the header.
But to that point - I noticed that Tom is storing the time of exposure start
while Michael is storing the tie of mid exposure.  Which should we be using?
Which is more common amongst professionals?

Thanks,

Mike G.

-----Original Message-----
From: owner-tass@listserv.wwa.com [mailto:owner-tass@listserv.wwa.com]On
Behalf Of Tom Droege
Sent: Monday, December 17, 2001 10:36 PM
To: Michael Sallman; tass@listserv.wwa.com
Subject: Re:Disk Set 20: dates and times


Mike, and all,

No, I did not change it.  I thought I remembered making this change, but it
was not made.

Should I make it now?

I still hope to rescue all this data.  I do have records of the calendar
day that I took the data and the time is always checked, so I should be
able to straighten it out.

Tom Droege

At 08:51 PM 12/17/01 -0600, you wrote:
>Tom, Michael & all,
>
> >>The Julian Date corresponding to this time is 2,452,240.818.  Note
> >>that the file name has "2239818" instead of the expected "2240818".
> >>So that particular file (which comes from Disk 7 or 8) has a file
> >>name which is off by one day.
>
> >>                                   Michael Richmond
>
>It's also that way for Disk 20:
>hvra2246774.fits V        2452247.77412   99.8 object     72.6    7.0
>(from make_list.out)
>
>Tom, did you ever get a chance to test if the "fix" below solved this
>problem?
>
>Mike
>
>
>Michael Sallman wrote:
> >
> >
> >
>
  ------------------------------------------------------------------------
> >
> > Subject: Re: Notes on Disk Set 19
> > Date: Thu, 18 Oct 2001 18:18:21 -0500
> > From: Michael Sallman <msallman@pro-ns.net>
> > To: Tass <tass@listserv.wwa.com>
> > References: <4.2.2.20011015215827.00de0350@pop.veriomail.com>
> >
> > Tom,
> >
> > I just took a quick look at model.bas and noticed this:
> >
> > TilNow# = JulianDay# - 2451545.5#       ' Days since Jan 1, 2000
> > midnight
> >
> > If Jan 1, 2000 midnight is 1/1/2000 0h UT, I think it should be
> > 2451544.5.
> >
> > I haven't had a chance to test it out (though it does add the 1 day),
> > but I thought I'd at least mention it in case it's obvious to you (or
> > someone else) if this is the problem or not.
> >