>At first - shame on me - i's of course the GSC not the HSC atalogue ;-)
The full name is HST-GSC: Hubble Space Telescope Guide Star Catalog.
It is important to remind the origin of this catalog. It was never conceived as
a full sky reference catalog but is just a large collection of star to help the
operation of the Space Telescope.
The bright stars where added later in the 1.1 version from the Tycho Input
Catalog (the Hipparcos observing plan).
>Why are field 5 und 6 also grayed?
Because they are duplicated on the two column. This is probably better if I
remove them.
>OK - this could explain the "holes" - but please look at my new
>picture. With 15 degrees there is a clustering visable looking like a
>cross - and it's not a milkyway ;-) The pattern is much more visible
>if I increase the field of view. Ths realy looks like overlapping- and
>overlapping would meen, that some stars are not correct placed in the
>chart.
This is the limit of four Schmidt plate (7 degree FOV). The plate overlap
produce many duplicate in the plate border. Look at a small field in the cross,
really there is not so much double star here!
>From its documentation the GSC contain 25 million entries for about 15 million
>objects.
>But limiting in V3.x is a little bit more complicated, because of the
>use of Field-No. - the limiting must relate to a field of view
The limit will probably be the nearest field you define below 15 degree. This
is the field 5 for 10 degree by default.
>Can anyone reproduce the holes and clusters - or do I have a local
>problem on my PC?
No problem with your PC. Just wait impatiently the release of the full UCAC,
probably this year to throw this crappy GSC.
>PS: I'm a technical editor, and I would like to help creating a German
>Help for V3.x. How stable are the dialogs?
This version is not stable enough for translation. I will call here when this
is ready.
Patrick
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