(IAAC) Obj: NGC 6940, 8/7 - Inst: Brennweite 12.5 inch homemade Dobsonian

[anonymous at sedna.atmob.org]

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Observation Poster: Steven H. Yaskell <steven.yaskell at wtnord.net>

Observer: Steven H. Yaskell
Your skills: Advanced (many years)
Date/time of observation: September 29, 2006 / 1950 UT
Location of site: Stockholm, Sweden (Lat 59:33, Elev 61m/200ft)
Site classification: Suburban
Sky darkness: 5 <Bortle Scale (9 worst)>
Seeing: 6-7 <1-10 Seeing Scale (10 best)>
Moon presence: Minor - crescent or far from object
Instrument: Brennweite 12.5 inch homemade Dobsonian
Magnification: x25, x40, x80
Filter(s): Deep Sky
Object(s): NGC 6940, 8/7
Category: Open cluster.
Class: E
Constellation: Vulpecula
Data: mag 8  size 20´
Position: RA 20:32.5n  DEC 28:08
Description:
Vulpecula's 6940, close to Cygnus border, resembles a small glowing diamond 
at x25, with the use of a Deep Sky filter. At x80 it loses this apparition 
and becomes less compact, to stars to the N, to staggered sets of stars 
W-E underneath. The background glow is still visible at x80, prominent
with the filter. It trails off to outliers E, in fact, and takes up at 
least 1/4 of a degree. At x40, it makes a teaspoon-like asterism.

At x80 it resembles the 13 inch image in Burnham (III) but unfortunately 
detect no central glowing core beneath the two above-face stars. I see
none of this,not even a glow. Chalk it up to my suburban sky and the 
slight autumn haze.

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