(IAAC) Obj: NGC 7635, Bubble Nebula, LBN 549 - Inst: 20", f/5 Obsession Dobsonian

[anonymous at sedna.atmob.org]

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Observation Poster: Cory Martin <cmartin at skyww.net>

Observer: Cory Martin
Your skills: Advanced (many years)
Date/time of observation: 1/31/06 at 01:32 UT
Location of site: Rural Northeast Nebraska, USA (Lat +41:54, Elev 1350)
Site classification: Rural
Sky darkness: 5.1 <Limiting magnitude>
Seeing: 4 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 20", f/5 Obsession Dobsonian
Magnification: 76x, 145x
Filter(s): none, OIII, DGM Optics NPB
Object(s): NGC 7635, Bubble Nebula, LBN 549
Category: Emission nebula.
Class: 
Constellation: Cas
Data: mag 11.0  size 15.0'
Position: RA 23:20  DEC +61:11
Description:
73x shows hint of nebulosity without filter.
OIII helps - nebulosity seen primarily around corner star (SAO 20575).
NPB filter seems better, especially near star.
145x with NPB reveals dark lane in nebulosity northeast of star.
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