Re: [guide-user] real stars and many catalogs

Andrea Pelloni Feb 6, 2004

At 20.06 06/02/2004, you wrote:
>Hi Alex, Andrea,
> I would expect to handle the "symbol" problem as described at
>http://www.projectpluto.com/future.htm#symbols

Hello Bill, so you give another way to solve this problem.
Perhaps another one could be to give a kind of "hierarchy" for the star
catalogs.
I mean, we know that each of the stellar databases has its own
characteristics, e.g. one has not stars with mag lower that 8 or higher
than 8, another one reaches mag 11 or another 15.6 only, one has very poor
star positions, another one has other characteristics.
Well, I would like to have the possibility to ask for e.g.:
"show the stars up to mag 19.5 with the minimum possible positioning error,
choosing among the following available catalogs on HD:
GSC1.1-USNOA.2-HYPPARCOS-UCAC.2".
A dream?
I think you have realized dreams well more difficult to become realty than
this one.
What do you think?
By and thank you

Andrea


> As is described there, one could then tell Guide to use a
>larger/smaller symbol, as desired.
>
> As to coloring star dots: the major problem with that, right
>now, is that stars can be colored by spectral type or not at all.
>A secondary problem is that the stars will still be essentially
>superimposed, so it'll still be common for one star to overdraw
>another.
>
> The best solution, at present, is to shut off any catalog
>not actually in current use. A better solution, in the future,
>would be for Guide to recognize situations where a given star is
>being drawn from multiple catalogs, and then show it only once.
>When you clicked on that star, and then on "more info", you'd
>get data from all the catalogs, including user-added ones. Some
>parameters would be needed to let the user define which stars
>would "match" between catalogs... a somewhat scary process, but
>not inconceivable.
>
>-- Bill
>
>
>
>
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Andrea Pelloni
RHP SpaceGuard Team
157 Frasso Sabino Observatory
http://www.ara-frasso-sabino.org/
Organizers of MACE 2004
http://www.ara-frasso-sabino.org/ara-inglese/mace_2004.htm



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