Thanks. I downloaded the new Tycho2 and other catalogs listed below
and that solved my problem about Occult not finding the Sept 5
event. The new data matches the Guide8 predictions pretty well,
showing the occultation path in NW Wisconsin rather than SE
Wisconsin (the latter being the Sky & Telescope location). Should I
assume that, at least for now, the best prediciton is that given by
Occult and Guide8 which both show the path in NW Wisconsin? In
other words, is the predicition of an event visible in SE Wisconsin
as published in Sky & Telescope now less considered less likely?

--- In guide-user@yahoogroups.com, "sc285" <rob515@k...> wrote:
> I placed in the files section of the group, the Goffin Planetary
chart
> which gives general information and locator charts. Steve Preston
> maintains the IOTA Asteroid occultations, and his website is
located
> at: http://www.asteroidoccultation.com/
> Since astrometry closer to the event can actually shift the path,
the
> article in S&T gives general information, but that can change.
>
> Incidently there is a NEW version of the Tycho2 catalog for Occult.
>
> Denis V. Denissenko wrote:
> "The cause of problem was identified - wrong order of stars in
several
> regions in Tycho2.dat. To make long story short, stars *were*
there,
> but WinOccult was *not* finding them because they were not at their
> places.
>
> I have completely rearranged Tycho2.dat in the correct order and
also
> recompiled tycho2.inx file. There are still all the same 3375961
stars,
> but now WinOccult is finding by 3-3.5 per cent more occultations!
> Especially in Gemini, Auriga and Taurus between declinations of
> +23.5..+24, +24.5..+25. +26.5..+27, +29.5..+30 and in Capricornus
and
> Aquarius at -2..-2.5 and -5..-5.5 bands. These are the results of
my
> test with occultations of stars brighter than 10.5m in 2005.
>
> The fixed version of Tycho2.dat and tycho2.inx is uploaded at
> http://hea.iki.rssi.ru/~denis/TychoNew.zip (64.264.832 Bytes, or
62758
> kB). Perhaps it will be desirable to upload the replacement at
IOTA ftp
> site after additional testing by Dave Herald and one or two
> calculators. If you have some downloading software like Download
Master
> or something like that, please use it rather than simple "Save as"
from
> your browser. File is too large, so it might take several
attempts."
>
> David Herald (author of Occult) wrote:
>
> I'm very happy to advise that I have now done a series of checks
on the
> files that Denis has re-created, and they are fine.
>
> Denis - thanks for the great work in fixing up this bug.
>
> Rob - can you upload the files from Denis' site, and put them on
the IOTA
> site with some explanatory notes. Main guidance - the new files
> required are
> Tycho2.dat, Tycho2.inx, and HipparcosIndex.dat - and these simply
replace
> the existing files of that name in the StarCats directory.
>
> Dave H
>
> The file is also located at the IOTA FTP site:
> ftp://lunar-occultations.com/pub/
>
> More detailed information can be found on the Occult Yahoo
discussion
> group archive located at:
> http://groups.yahoo.com/group/occult-software/
>
>
> Rob Robinson
> VP of IOTA Occultation Services
>
>
>
> --- In guide-user@yahoogroups.com, "toadatrix" <jsnyder@w...>
wrote:
> > I discovered that for some reason, I don't know why, the Tycho 2
> > star 5244-0017 is not in the Tycho 2 catalog supplied with
Occult.
> > It is in Guide8 so I used the Guide8 position of it and added it
to
> > Occult. I then recomputed the occultation using Occult and the
> > reported times and occultation path are similar to, but not
exactly
> > the same as, those shown by Guide8. Both Guide8 and Occult show
> > paths for this event that are well to the north and west of the
path
> > shown in the March, 2004 Sky & Telescope.
> >
> > --- In guide-user@yahoogroups.com, "toadatrix" <jsnyder@w...>
wrote:
> > > According to the March, 2004 issue of Sky & Telescope (page
103,
> > > 106) the asteroid 107 Camilla will occultate the 11.8
magnitude
> > star
> > > TYC 5244 0017 on Sept. 5, 2004 at around 9h UT. The map shown
on
> > > page 103 shows the central path passing over the southern part
of
> > > Wisconsin where I live. I calculated the same event in Guide
8b
> > and
> > > found the central path missing southern Wisconsin all together
and
> > > passing, instead, over the north west corner of Wisconsin.
> > >
> > > Since Guide has always been dead on accurate for me I have to
ask
> > > what accounts for the difference and which prediction (if any)
may
> > > be correct? I should mention that I also tried to find this
event
> > > with the latest version of Occult and I couldn't find it at
all
> > > (that was really surprising). Is there a way to get the
latest
> > > information into Guide so as to get the most accurate
> > predictions?
> > > Where would I go on the web to get that latest information?
> > Thanks.