IC5146 Cocoon Nebula in Halpha from 18" Cassegrain

Click on image to enlarge

shot on November 19, 2004 from my backyard in Castro Valley, Ca. 

Compact Collapsible Cassegrain 18" @f/12.60 (F=5760mm)

IMG6303E camera @-35C

AO7 @ 16 Hz

RCOS Dichroic beam splitter

ST7E guide camera

FLI CFW1 Filter wheel

Optec TCF-S focuser

Schuler Ha  filter

11 exposures of 20 minutes through Schuler Halpha filter (binned 2x2, scale=0.64 arc-sec/pixel)

three hours 40 minutes total exposure

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