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Date: Tue, 12 Mar 2002 22:55:49 +0100 From: Francisco Manuel Rica Romero <fco.rica@sinix.net> Subject: Re: [vsnet-chart-problem 7] (fwd) Re: GK Per 118 S COMP Hello friends: There are a wonderfool paper that study the GSC photometry comparing with Tycho catalog: "A Photometric Calibration of The Guide Star Catalogue" by C.Fabricius. In this paper don't apear the reference but with Abstract Services of CDS it can be fond. The color term: ======================================= Band Emulsion+ filter Color Term ======================================= J 103aO+blue OG +0,58 J IIIaJ+GG385 +0,48 J IIIaJ+GG395 +0,44 V IIIaJ+GG495 +0,09 V 103aG+GG495+yellow OG +0,03 V IIaD+GG495 -0,04 V IIaD+W12 -0,11 V IIaD+GG495+yellow OG -0,21 E 103aE+ red plexi -0,29 ======================================= The calibration is complicated by magnitud-dependence in addiction with color-dependence. greetings. ==================================================================== Francisco Manuel Rica Romero Astronomical Society of M-Ai(Brida (Spain) fco.rica@sinix.net (Double Star Measurements web: http://teleline.terra.es/personal/fco.rica/home.htm) ====================================================================
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