Author of "What's Up" articles for CN Author "Touching the Universe" iUniverse Author "Deep Sky Observing" Springer Author "Nebulae and How to Observe Them" Springer 8" Celestron SCT and Vixen ED 80 on a CGEM Canon T2i camera and lenses for piggybacking
Thomas Watson - Author of Mr. Olcott's Skies. Available in paperback and ebook formats. Weblog: Under Desert Stars
NP-101 on a DM-6
Teeter 11" STS/Waite Mirror
Zeiss, Fujinon, Nikon, Vixen binoculars
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 - TEC 140 - AT 65EDQ APO Refractor - Astro-Physics Mach 1 GTO Mount - iOptron ZEQ25 mount - Discmount DM6 - Canon 60Da
Quote:I prefer the Hass book. The Cambridge Atlas, for some reason, does not give Position Angle. For difficult doubles, being able to visually match the published PA really confirms that the secondary has been identified
Stellarvue SV70ED, UA DwarfStar, Oberwerk / AstroTech AT80EDT, AT Voyager / Celestron C6XLT, AT Voyager / Meade 8" LightBridge / Vixen VMC 110L (Baader Solar Film), Porta II / Celestron Nexstar 102GT, ES Twilight I / Oberwerk 20x80 DIII, Orion 10x50 Resolux
Quote:Mmm, I can see how the pair would make a nice 1-2 punch, but for starters it's the charts I really need. I think I'll pick that one up and then get the Hass book down the line for the additional info once I start hitting a wall of what I can confirm seeing on my own. Thanks all
Quote:Quote:Mmm, I can see how the pair would make a nice 1-2 punch, but for starters it's the charts I really need. I think I'll pick that one up and then get the Hass book down the line for the additional info once I start hitting a wall of what I can confirm seeing on my own. Thanks all
Quote:Regarding P.A., stars in the telescope field of view will ALWAYS drift out of view to the west (called the 'preceding' quadrant). In a reflector, just memorise "poisonous snakes feel nice" to name off the cardinal directions clockwise from west (preceding) - in other words, position angles corresponding to 270, 180, 90 and 0/360 degrees, respectively.
Quote:Could someone explain this "poisonous snakes feel nice" thing to me. I might be having a bonehead moment, but I dont know what this means.
Avid reader, urban stargazer, & cigar aficionado
Quote:Jason asked:Quote:Could someone explain this "poisonous snakes feel nice" thing to me. I might be having a bonehead moment, but I dont know what this means. Hi JasonI think it helps you to remember how some astronomers describe the cardinal directions.poisonous = preceding = westsnakes = southfeel = following = eastnice = northpeace & clear skies,
André Vaillancourt Visual observer only since 1974 Skyshed POD / C14 HD 355/3910mm / CGE pro Lunt LS152 152/900mm solar / CGEM DX Celestron C80 80/600mm LS50Ha solar filter Ile Perrot, Québec, Canada / 53 years old / red zone SQM 19
Quote:I can honestly say I've never heard anyone speak scornfully of Norton's Star Atlas and Reference Handbook. It is a classic, and most amateur astronomers I know own a copy. I use the 19th edition, which can be found very cheaply through online used book sources. There's a 20th edition, but IIRC when I looked at it I saw no reason to replace the one I had. (The 20th ed. also had some serious printing errors in the first print run, so don't go for a copy of the 20th that you can't inspect before buying.)
I want to do more then just look.
--------------------Clear Skies, PJ Refl.- 203/1420; Refr.- 110/616, 75/500; Bino.- 15X60, 10X50, 8X30 __________________________________________________
Quote:I have a couple of editions of Norton's Star Atlas. An 18th edition (1991) and a 6th edition (1937). The 6th edition is my favorite. The map format has not changed, but the earlier edition has more double stars and it uses the older designations such as the Struves, Herschels, etc., that have been removed in the later edition.
Quote:Sweet! How did you come across the older 6th edition?
Quote:Quote:Sweet! How did you come across the older 6th edition? About 20 years ago, I found it on the shelf of a used book store in my little town. I couldn't believe my eyes. The owner said she found it in the "going-out of business" inventory of another used book store. I think I paid $10.