David Cotterell Toronto, Ontario "If an observer actually sees an object, there is no point in referring to a formula to find out whether he ought to see it; and if he fails to detect it, no formula will ensure his success." - W.H. Steavenson 8" f/15.5 TEC Maksutov 16" f/5 Teeter/Zambuto Dob 66mm WO SD AT 65EDQ APO Refractor Astro-Physics Mach 1 GTO Mount iOptron ZEQ25 mount Canon 60Da
Quote:The advertised magnitude data for faint stars seems even less reliable than the (despite the great efforts for the WDS catalogue) not this reliable double star informations.Tycho, AAVSO, ... other catalogues or measurements - most of the time rather different values.
I ache, therefore I am