Bubble Nebula Region
Characteristics:
Size: The
FOV shown here is approximately 3.9 x 3.9 degrees, at an image scale of
3.5"/pixel
RA (J2000): 23h 17m 00s
Dec (J2000): +61 degrees 00' 00"
Description:
The Bubble Nebula (NGC 7635) is one
of only a
few "bubbles" identified in the night sky, and it forms a photogenic
partner with the open cluster M52 and surrounding nebulae such as
Sh2-157, Sh2-161 and NGC 7538. It is
an unusual planetary nebula named for the surrounding bubble that is
seen in the upper right portion of the photograph above, caused by gas
ejected from a massive central star. The rate of ejected gas is
so brisk that it "runs into" the wall of the surrounding nebula, thus
creating a boundary of higher density gas that forms the outer shell of
the bubble. More information about this process may be found here.
Additional information about the Bubble Nebula can be found on Rob
Gendler's website.
Photographic
Details:
Dates: August 17, 23, and 24,
2012
Scope: Takahashi
FSQ106 at f5 on the Takahashi NJP
Mount
Autoguider: SBIG ST-402 with
60mm guidescope, focal length 227mm
Camera: Apogee U16M at -20C, with
7 position 50mm square filter wheel (Apogee FW50-7S)
Filters: Baader
Ha narrowband
filter; Baader RGB filters
Exposures: Ha, 4 hours; R, 3 hours;
G, 2 hours; B, 3 hours, all unbinned.
Total
exposure 12 hours.
Post-processing:
Calibrated, aligned and
stacked in Maxim, followed
by DDP
in ImagesPlus (IP). Further processing in Photoshop CS5
Please
note: Graphics on this website
may not be reproduced without author permission.
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