Hi John, Thank you .
I have understand this effect of the photo emulsion. Regards, Oleg > > UNA 0525-42438046 > > Visual Magnitude: 0.10 > > Blue Magnitude: 0.10 > > ... > > Mean J2000 RA: 20h26m53.043s DE:-37°24'11.55" > > I get the same type of results here. Note that all of these examples happen > to be very near relatively bright stars, so the Palomar sky survey plates are > saturated. The deeper catalogs are all based on those plates, so there are > errors in these regions. You can use the DSS online overlay (these are the > Palomar images) to see what I mean- just one huge white ball about an > arcminute wide, so when these plates were processed (by machines) to find the > stars in the USNO catalogs, the fainter stars in these regions aren't really > detected at all- these are just spurious detections. > > Apparently there's a glitch in CdC that doesn't read the "magnitude 99" > correctly. But this works right if you use USNO-B. > > But note using B that there are also many mag 99 stars in a cross pattern > just outside the big white ball- this is the diffraction spikes, incorrectly > detected as stars! > > -John > > > > UNA 0525-42045984 > > Visual Magnitude: 0.10 > > Blue Magnitude: 0.10 > > ... > > Mean J2000 RA: 20h07m44.780s DE:-31°45'07.78" > > > > -Oleg :) More catalogues for CdC on http://astroclub.biz/ru/?page_id=3 With best regards, Oleg Maliy Zaporozhye Astronomical Club "Altair" http://astroclub.biz/ru/ Zaporozhye (47N48, 35E10) Ukraine -- реклама ----------------------------------------------------------- Доволен товарищ машиной с бюджетом? Умен ты и девушкам люб? Ты можешь легко увеличить все это, вступив в лучший покерный клуб! www.cccppoker.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/skychart-discussion/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/skychart-discussion/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> 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/
