--- likestargazing <[EMAIL PROTECTED]> wrote: > @John, > @Len, > > many thanks for your quick answers :-))) > > 1. Holes around bright stars. > Ok I can recognise the same dark holes in CdC V2.76 - it´s seems to be > a "feature" of tne HSC-catalogue ;-) > But brigth Capella is visible ?-)
Yes, the auto-scanning methods can find very "large" stars, but fainter stars around it are lost in the glare. And I think the deeper catalogs were often supplemented by adding entries from less-deep catalogs, to help fill in at least the brighter stars in these areas. > 2. OK fields of 10° ore more make no sense with the HSC. CdC and any > other starchart program slow down because of the amount of stars. > But what is going on in the shown case. There is a obvious clustering > of stars - it looks like a overlapping effect. I don't see a problem in the second image. I see some areas that have a noticably higher denser of moderately bright stars than in other areas, where there is almost nothing but faint stars. But I see a shading on one side, which might be the Milky Way (I'm not too familiar with v3 yet). In that case, large dark nebula are common near the band of the Milky Way, and these greatly cut the density of brighter stars. In fact this image looks very much like a real view of a part of the sky containing a dark nebula, as seen through binoculars. > In wider fields, > overlapping seems so strong that square dark holes are the result. The software is probably not designed to use GSC in large fields, but maybe Patrick hasn't yet put in error handling to make sure that you (and the software) don't try it. -John __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/skychart-discussion/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
