When they talk about "mag" or sometimes "V-mag" they are usally referring to Visual magnitude. Just like it looks to eye. B-Vmag is usually the Color Index relating to blue. It is a number with the lower ones being more blue and higher more red. Photographic magnitude is how bright the star is to a camera. Sometimes referred to as Blue magnitude or B-Mag, not to be confused with B-V mag. What all this means is: "5- 8 F4.2 mag ci color index": translates to columns 5 through 8 contain a floating point number with 4 digits and has 2 decimal places. This is the color index or B-V mag of the star.
"9- 14 F6.2 mag Ptm Photovisual magnitude" Would be columns 6 through 14 contain a 6 digit floating point number with 2 decimals that is the B-Mag or photographic magnitude of the star. Hope this helpes. bob --- In [email protected], "R Arber" <[EMAIL PROTECTED]> wrote: > Hello, > I'm finding when I try to match fields in window #3 in CatGen with catalog, i.e. I'm using <I/90 Positions of 502 Stars in Pleiades Region (Eichhorn+ 1970)> that the CatGen fields, i.e Mag(mag); B-V (mag); Mag B (mag); Mag R (mag)., do not match description as per the catalog. > As an example the catalog I-90 calls for: mag CI; mag Ptm., as its definition of magnitude, right? (Please see below): > 5- 8 F4.2 mag CI Colour index > 9- 14 F6.2 mag Ptm Photovisual magnitude > > The preceding is an example of one situation in one catalog, I'm having other mis-matches in other catalogs. > Is there a method of interpreting, or a glossary of terms of these many various field definitions that one encounters; so that the uninitiated can recognize and translate them so that they fit into the appropriate fields in CatGen. > > Please accept my thanks for your kind help in advance, > Thank you, > Bob > > [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Yahoo! Domains - Claim yours for only $14.70 http://us.click.yahoo.com/Z1wmxD/DREIAA/yQLSAA/1.XolB/TM --------------------------------------------------------------------~-> To Post a message, send it to: [email protected] To Unsubscribe, send a blank message to: [EMAIL PROTECTED] 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/
