(IAAC) Obj: Cocoon Nebula (I.51469 - Inst: Bresser 4.8 inch refractor

anonymous at sedna.atmob.org anonymous at sedna.atmob.org
Thu Sep 8 13:25:18 EDT 2005


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

Observer: Steven H, Yaskell
Your skills: Advanced (many years)
Date/time of observation: Sep. 6, 2005: 2156 UT
Location of site: Stockholm, Sweden (Lat + 59, 33, Elev +18.06)
Site classification: Suburban
Sky darkness: 5 <1-10 Scale (10 best)>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: Bresser 4.8 inch refractor
Magnification: x25, x80
Object(s): Cocoon Nebula (I.51469
Category: Emission nebula. Reflection nebula. Dark nebula.
Constellation: Cygnus
Data: mag   size 
Position: RA 21:c.55  DEC c.+46:
This diffuse or bright nebula is easily found on a dark
night a little down from M 39. I use my 12.5mm 
Kellner (x80) and this easily fills the center of my 
ocular. At this power I see two clumps of gas, NE 
around a dual star and past the coat hanger hook W,
then SE to another more diffuse area with some stars
sprinkled in it. The empty areas between the gaseous
areas are the dark streamers that only look like open

At x25 (40mm Kellner, 1/14 inch) I get to see - faintly -
the entire outline of the cocoon, containing the asterisms
seen above but no dark streamers. It is a little better 
than the typical wide-field binocular view. I recommend
40mm oculars for this object on small scopes (2-6 inch).
But you need good seeing in any case.

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