Tuesday, February 6, 2018
Sharpless 157, project continues
The weather conditions up here 65N has been worst in ten years astro photographyvise
Wednesday, January 17, 2018
Sharpless 157 (Sh2-157) in visual colors
We have had only two clear nights, January 7. and 8., at this month. I shot exposures for this target at both nights.
I have publish a mapped color version out of Sharpless 157 at January 14. This new version shows the target in visual spectrum. Ionized hydrogen (H-alpha) and sulfur (S-II) are emitting red light, ionized oxygen (O-III) emits bluish light. This is a kind of difficult target due to large intensity variations and low surface brightness.
Sharpless 157 (Sh2-157)
Please, click for a large image
Image is in Natural color palette from the emission of ionized elements, R=Hydrogen + Sulphur, G=Oxygen and B=Oxygen + 10% Hydrogen to compensate the missing H-beta emission. A mapped color version can be seen HERE.
A closeup
Please, click for a large image
INFO
Sharpless 157
An older wide field photo of the area
Please, click for a large image
H-alpha, 12 x 1200 s, binned 2x2 = 4 h
O-III, 10 x 1200 s, binned 4x4 = 3 h 20 min.
S-II, 9 x 1200 s. binned 4x4 = 3 h
Total 10 h 20 min
A single uncropped, calibrated and stretched 20 min. exposures, for H-alpha, S-II and O-III emissions, as they come out from the camera.
H-alpha
S-II
O-III
Please, click for a large image
A closeup
Please, click for a large image
INFO
Sharpless 157
The night sky between the constellations Cassiopeia and Cepheus is rich with nebulae and star clusters. The nebulae visible in this image include Sharpless 157 and Lynd’s Bright Nebula 537. The star clusters include Markarian 50 and NGC 7510.
Sharpless 157 is sometimes referred to as the Lobster Claw Nebula for obvious reasons. The bright spot at upper left quarter of this photo is Lynd’s Bright Nebula (LBN) 537. Also designated at Sh 2 – 157a, it is a ring nebula around the Wolf-Rayet star WR 157.
At the lower right quarter of the image lays open star cluster NGC 7510.
An older wide field photo of the area
Please, click for a large image
The area of a new photo is marked as a white rectangle. The Bubble nebula can be seen as a bluish pearl, just half a degree North West from the Sharpless 157.
This photo is shot at 2007 with a QHY 8 astrocamera and the Baader narrowband filter set, H-a, S-II and O-III
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 50% 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 x 2 and SXV-AOL
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
5nm H-alpha 3nm S-II and 3nm O-III
Exposure times
H-alpha, 12 x 1200 s, binned 2x2 = 4 h
O-III, 10 x 1200 s, binned 4x4 = 3 h 20 min.
S-II, 9 x 1200 s. binned 4x4 = 3 h
Total 10 h 20 min
A single uncropped, calibrated and stretched 20 min. exposures, for H-alpha, S-II and O-III emissions, as they come out from the camera.
H-alpha
S-II
O-III
Sunday, January 14, 2018
Sharpless 157 between Cassiopeia and Cepheus
We have had only two clear nights, January 7. and 8., at this month. I shot exposures for this target at both nights. This is a kind of difficult target due to large intensity variations and low surface brightness.
Sharpless 157 (Sh2-157)
Please, click for a large image
A closeup
Please, click for a large image
INFO
Sharpless 157
The night sky between the constellations Cassiopeia and Cepheus is rich with nebulae and star clusters. The nebulae visible in this image include Sharpless 157 and Lynd’s Bright Nebula 537. The star clusters include Markarian 50 and NGC 7510.
Sharpless 157 is sometimes referred to as the Lobster Claw Nebula for obvious reasons. The bright spot at upper left quarter of this photo is Lynd’s Bright Nebula (LBN) 537. Also designated at Sh 2 – 157a, it is a ring nebula around the Wolf-Rayet star WR 157.
At the lower right quarter of the image lays open star cluster NGC 7510.
An older wide field photo of the area
Please, click for a large image
The area of a new photo is marked as a white rectangle. The Bubble nebula can be seen as a bluish pearl, just half a degree North West from the Sharpless 157.
This photo is shot at 2007 with a QHY 8 astrocamera and the Baader narrowband filter set, H-a, S-II and O-III
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 50% 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 x 2 and SXV-AOL
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
5nm H-alpha 3nm S-II and 3nm O-III
Exposure times
H-alpha, 12 x 1200 s, binned 2x2 = 4 h
O-III, 10 x 1200 s, binned 4x4 = 3 h 20 min.
S-II, 9 x 1200 s. binned 4x4 = 3 h
Total 10 h 20 min
A single uncropped, calibrated and stretched 20 min. exposures, for H-alpha, S-II and O-III emissions, as they come out from the camera.
H-alpha
S-II
O-III
Saturday, January 13, 2018
IC1396, a detail image
We have had two clear nights in this month. Here is my "quickie" shot of IC1396 from night at January 07.
Just three hours of exposures with Apogee Alta U16 and Atrodon H-alpha filter 5nm. Colors are from my older wide field photo.
Just three hours of exposures with Apogee Alta U16 and Atrodon H-alpha filter 5nm. Colors are from my older wide field photo.
A detail of IC1396
please, click for a large image
Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen. The photo covers about one square degree of sky. (The full Moon covers about 0,5 degrees of sky.)
A wider view
please, click for a large image
Area of the new photo is marked as a white rectangle to this older wide field photo of IC1396. Image is from year 2010 and it's taken with Canon EF 200 mm f1.8 camera optics, Baader narrowband filters and QHY9 astronomical camera.
Even wider view
please, click for a large image
Area of the new photo is marked as a white rectangle to this older wide field photo of IC1396. This mosaic image of ten panels is back from year 2014 and it's taken with Canon EF 200 mm f1.8 camera optics, Baader narrowband filters and QHY9 astronomical camera. More info about this photo can be seen HERE
Couple of older shots from IC1396 details
Elephant's Trunk Nebula
Another detail of IC1396
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