Monday, October 27, 2008
Sh2-155, The Cave Nebula
"natural" color version
H-alpha
Version with reduced stars
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Last night I shot a new Sharpless catalog object, Sh2-155 in constellation Cepheus.
It's sometimes called the "Cave Nebula" doe the central formations shape,
I can't see the cave there though.
I shot three hours of H-alpha and one and half hours of O-III.
There is very litle of O-III there, but with extreme stretching of the data it was usable.
Image here is a narrowband color composition where H-alpha is Red and
O-III is Blue, Green color is synthesized from H-a and O-III channels.
There is three versions, first with "natural" colors and second with H-alpha only.
Third image is same color image but with reduced stars. The purpose of this image is
to show the nebulosity alone.
_
Imaging data:
Camera, QHY8
-
Filters,
Baader 7nm H-alpha, Baader 8,5nm O-III and Baader
-
Optics,
Tokina AT-X 300mm @ f2.8
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Exposures,
9X 1200s H-alpha, 4 X 1200 O-III + flats and bias
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Guiding,
LX200 GPS 12" + PHD-guiding and Lodestar
Sunday, October 26, 2008
Sh2-171
S-II, H-alpha and O-III as a Hubble palette
H-alpha, O-III, synthesized Blue as a "Natural" color
H-alpha
-
Sh2-171 is an emission nebula in Cepheus.
I have shot few objects from the Sharpless catalog before, I find them interesting and
not too common as an imaging targets.
Here is three versions, first is a narrowband color version in Hubble palette,
second is a "natural" color version with synthesized green from H-alpha and O-III.
Third, black and white, is a hydrogen alpha channel only.
-
Imaging data:
Camera,
QHY8
-
Filters,
Baader 7nm H-alpha, Baader 8,5nm O-III and Baader 8nm S-II
-
Optics,
Tokina AT-X 300mm @ f2.8
-
Exposures,
9X 1200s H-alpha, 3 X 1200 O-III and 3X1200s S-II + flats and bias
-
Guiding,
LX200 GPS 12" + PHD-guiding and Lodestar
Saturday, October 25, 2008
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