Hi Bill!

Thank you for the clarification!
As I understand it, the problem of identification of the stars streaks is
limited to a very small percentage so as to facilitate, in the future, the
best solution!

As soon as it fixed the problem, please expect a confirmation!

Thank you again!


Alfredo


2013/4/7 Bill Gray <pluto@...>

> **
>
>
> Hi Alfredo,
>
> It'll probably be something that patches UCAC-4, much as the 'modifs'
> software fixes the erroneous high proper motion stars.
>
> I've swapped some e-mails with Skip Gaede (who, with Han Kleijn, the
> author of the 'Hallo Northern Sky' free planetarium software, has been
> doing much of the actual work on determining which stars are in the
> streaks). He and Han would like to make sure they've got things as
> good as possible before any "fix" programs are provided. (By "as
> good as possible", we mean "as many artifacts found as possible,
> without throwing out too many perfectly good stars.")
>
> I'd certainly rather provide one fix that really addresses the
> problem, rather than a fix now plus one in a month or so when the
> search for streaks has been finished.
>
> One piece of good news: about 96% of stars in UCAC-4 were matched to
> the 2MASS catalog. The remaining 4%, I've found, are usually not real
> stars, and Guide doesn't draw them.
>
> Of the streak stars, about 2/3 (at present) lack 2MASS matches. So
> Guide has already thrown out 2/3 of the streak stars.
>
> -- Bill
>
>
> On 04/06/2013 03:08 PM, alfredo caronia wrote:
> > Thank Bill!
> >
> > Then you just have to wait to know the software to fix the problem of the
> > stars streaks!
> > It will probably be in an upcoming update of Guide 9 or in what way?
> >
> > Regards!
> >
> > Alfredo
> >
> >
> > 2013/4/5 Bill Gray <pluto@...>
> >
> >> **
>
> >>
> >>
> >> Hi Alfredo,
> >>
> >> Thanks for pointing this out to me.
> >>
> >> Skip Gaede has already done the hard part; there's a text file on the
> >> SkyChart page
> >> containing the IDs of all the afflicted stars. I could pretty easily
> write
> >> a little
> >> program that would read his text file in and modify the "streak" stars
> >> accordingly.
> >> (Looks as if there are now another 51210 of them, in addition to those
> >> identified
> >> in the production of UCAC4.)
> >>
> >> I've just e-mailed Skip Gaede and Norbert Zacharias about this. My guess
> >> is that
> >> one or both of them may already have written the software to fix those
> >> 50210 stars
> >> (most near the galactic center). I'd prefer not to re-invent the wheel.
> >> I've also
> >> asked for confirmation that this is all the streaks they expect to find,
> >> at least
> >> for a while.
> >>
> >> But once there's a "final" list of streak stars, it'll be simple to fix
> >> them.
> >>
> >> -- Bill
>
>
>

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