SH2-142 and NGC 7380
RA (J2000): 22h 47m 14s
Dec (J2000): 58 degrees 01' 55"
Position Angle (Pinpoint): plus
This image represents a total Ha exposure of 6.7 hours taken over two
consecutive nights during a near full moon and
particularly "good" seeing for my site (FWHM around 2.5").
SH2-142 is an emission nebula ionized to
radiate Ha light by the eclipsing binary DH Cephei (HD 215835).
It is a beautiful nebula filled with a variety of shapes, including
arcs, globules, and dark dust regions. NGC
7380 is an open star cluster that is physically intertwined with this
emission nebula, and is better appreciated in color renditions of this
region. NGC 7380 was originally discovered by Caroline Herschel
in 1787. A nice description of this object may be found here,
and Rob Gendler's RGB mosaic of this region may be found here.
Feel free to check out the larger versions of this image in the links
Date: September 5 and 6, 2009
Scope: VC200L at
f6.4 on the Takahashi NJP Mount
Autoguider: SBIG ST-402 with
60mm guidescope, focal length 227mm
Camera: Apogee U32
Ha (6 nm)
Ha (20 x 20').
exposure time 6.7 hours
Conditions: Temperature 58-70 degrees F.
Post-processing: Calibrated, aligned, and
Sigma Clip combined
in Maxim, deconvolution in Maxim using Bob
Vanderbei's Fat Tail Deconvolution script (3 iterations), followed
in ImagesPlus (IP). Further processing in Photoshop CS4 (16
note: Graphics on this website
may not be reproduced without author permission.
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