Wednesday, November 9, 2016
A rare image out of the planetary nebula in Cassiopeia, KjPn8 (PN G112.5-00.1)
Few year back I added this small target in Cassiopeia to my imaging plan. Now we had few clear nights and I was able to finalised a new photo out of it. This is a very dim target and it located just next to famous Bubble Nebula. Total exposure time was around 11 hours for Ha and O-III.
PN G112.5-00.1
Click for a full size photo
Image is in natural colours from the emission of ionized elements, H-alpha and O-III.
An experimental starless version to show the actual PN better
A bright spot at the centre of the planetary nebula KjPn8 is the central disk (Diameter 4 arc seconds).
An experimental starless version to show the actual PN better
A two frame mosaic with the Bubble Nebula
Click for a full size photo
INFO
KjPn 8 (PLN 112-0.1) is an unusually-shaped (14' x 4') planetary (PN) nebula located in the Constellation of Cassiopeia at RA 23h 24m 10s and DEC +60d 57m 30s. It is partially embedded in hydrogen nebulosity from the often-imaged Bubble Nebula complex (NGC 7635, Caldwell 11) and the open cluster, M52, located off the upper right side of this image. North is up and the field is ~ 35' x 35'. Lopez et al. (Astrophys. J, v538, 233-240, 2000) describes KjPn 8 as an "extreme polypolar planetary nebula with a large scale structure characterized by a giant biconical envelope". Steffen and Lopez (Astrophys. J. v508, 696-706, 1998) suggest that the strange tubular structure results from the action of a bipolar, rotating episodic jet whose direction has changed with time. The radial velocity measurements suggest a distance of ~5,200 light years. They suggest that it formed from two distinct and consecutive PN-like events starting with a binary core have stars of similar mass. One event led to the very long structure (NW-SE). The other (NE-SW) extends between the bright pinkish lobes that are enriched in OIII. They further suggest that KjPn 8 may be a rare object in the Milky Way Galaxy. (Source, http://astrodonimaging.com/gallery/kjpn-8-tubular-planetary-nebula/ )
Orientation
Technical details
Processing work flow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 25% weight
Color combine in PS CS3
Levels and curves in PS CS3.
Imaging optics
Celestron Edge HD 1100 @ f10 with 0,7 focal reducer for Edge HD 1100 telescope
Mount
10-micron 1000
Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2 and SXV-AOL
Astrodon filter, 5nm H-alpha
Astrodon filter, 3nm O-III
Astrodon filter, 3nm S-II
Exposure times
H-alpha, 21x 1200s = 7h
O-III, 12 x 1200s binned = 4h
Total 11 h
A single uncropped, calibrated and stretched 20 min H-alpha frame
A single uncropped, calibrated and stretched 20 min H-alpha frame
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