Hello Patrick,
Hello John,
many thanks for all your answers ....
@John
>Not all star catalogs are under preferences>catalog and object
>parameters>stars1 or stars 2. In this window, click the "catalogs"
>tab to find the hip catalog and turn it off.
>Other catalogs are under the "size", "magnitude", or "nebulae" tabs.
merci - I've found it with your help, how to switch off all stars.
>I think I see it. I just downloaded your new picture and added a
>yellow outline of what I think is the cross. See the new image in the
>folder. I also noticed something that looks like a sharp edge to the
>star density, within the horizontal part of the cross, and outlined
>it again in yellow.
Exactly - I've recognised the sharp edge too. Your yellow outline is a
good help to locate this "cross".
Patrick has the right answers :-)))
It's really a overlapping - a overlapping of 7° Schmidtplates.
@Patrick,
> This is the limit of four Schmidt plate (7 degree FOV). The plate
> overlap produce many duplicate in the plate border.
I think this is exactly what is visible on my screenshots.
> From its documentation the GSC contain 25 million entries for
> about 15 million objects.
Does that mean, that 10 millions objects are double or more listed in
the charts?
> Look at a small
> field in the cross, really there is not so much double star here!
I've done and I haven't recognised any doubled Star or any rasterd
pattern, but a higher density of stars is remarkable.
If 1 star-object is listed in 2 Schmidtplates (7 degree FOV), do this
star-objects get different GSC-numbers?
Concidering these facts it would only make sense, using the GSC
catalog in a 7° Fov. OK - in V2.x the GSC-catalog is limited to 0-7°
(also explained on the "Catalog descriptions"-site). But nevertheless
- moving around on the skychart will pass this overlapping areas.
Wouldn't it be better to stay in one of these 7° charts?
There are some theoretical solutions:
1. When "Schmidplates" are overlapping, only one layer of objects are
shown. Disadvantage - it's accidental, which stars are shown - I think
it would be difficult to reproduce the order of "Schmidplates"-layers.
2. To show a outline around the "GSC-7°-Fovs". Disadvantage - it looks
a little bit confusing.
3. Really show only one "Schmidplate"-Fov. Do you know OziexplorerCE,
it's a GPS Mapping Software, it works with scanned Maps. Only one map
is shown. If you pass or click in the neighbor-area the screen
switches to the selected map. Doing the same with the view on
GSC-charts, would show the exakt GSC-chart (without overlapping
objects). Disadvantage - the solution would look rather strange for
V2.x user.
many thanks
Dieter Wotschke
Neumarkt / Germany
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