Tuesday, November 3, 2020
Sharpless 124 (Sh2-124)
I found unprocessed material from my HD! Back in January 2016 I shot data for the Sharpless object 124 in Northern Cygnus. Something must happen at the time since I never processed the data.
Sh2-124 is an emission nebula in northern Cygnus at about 8.500 light years away. It doesn’t seem to be imaged very often, and I was not able to find much additional information about it.
Sharpless 124
Click for a large image
Image is in mapped colors from an emission of the ionized elements. Golden areas are from emission of sulfur and hydrogen, S-II and H-alpha, blueish areas are from ionized oxygen, O-III.Sh2-124 in H-alpha light
Click for a large image
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 @ f7 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, 15 x 1200s = 5h
O-III, 6 x 1200s binned 4x4 = 2h min.
S-II, 6 x 1200s binned 4x4 = 2h min.
Total 9h
Monday, November 2, 2020
A supernova remnant G65.3+5.7 SNR in visual spectrum
I have published this image in mapped colors yesterday. This time the color channels from narrowband channels H-alpha, O-III and S-II are combined so, that result is very close what human eye might see, if it could be sensitive enough.
G65.3+5.7 SNR in constellation Cygnus has about the same angular dimensions, than brighter and more famous remnant in Cygnus, the Veil Nebula. The angular dimensions are about 3x4 degrees. This is a very difficult target it has a large angular dimensions, very low surface brightness and the starfield is extremely dense in this part of the Milky Way.
NOTE, the "noise" in the photos is not a noise at all, it's glow from countless stars,
it can be seen in full size photo!
G65.3+5.7 SNR in visual colors
Please, click for a large image, it's worth it!
A closeup, lots of stars out there!
click for a large image
This is a closeup from the full resolution photo to show, how dense the star field really is!
H-alpha and O-III channels separated
O-III
click for a large image
click for a large image
Ha & S-II
click for a large image
A separated photos of the light from an ionized hydrogen and sulfur (H-alpha & S-II) and the light from an ionized oxygen (O-III). There is a big difference between elements. Note, the bright star just up from the center is almost invisible at O-III light. it's there but very dim at light of an ionized oxygen.
INFO
SNR G65.3+5.7 was discovered by Gull et al. (1977) during an OIII survey of the Milky Way. Some parts of this SNR were already catalogued by Stewart Sharpless in his SH2 catalog as SH2-91, SH2-94 and SH2-96, but they were not recognized as being part of a bigger structure at that time. The idea that they could be part of a larger SNR was postulated by Sidney van den Bergh in 1960, but it took until 1977 for this to be confirmed.
This is one of the larger SNR in the sky spanning a region of roughly 4.0×3.3 degrees. Mavromatakis et al. (2002) determined the age of the SNR to be 20.000-25.000 years and the distance about 2.600 – 3.200 light years. The shell has a diameter of roughly 230 lightyears! This SNR is a predominantly OIII shell with also some H-alpha signal.
Orientation in Cygnus
Technical details
Processing workflow
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
Tokina AT-x f2.8 camera lens
Mount
10-micron 1000
Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
5nm H-alpha 3nm S-II and 3nm O-III
Total exposure time
H-alpha, 12 x 1200 s, binned 1x1 = 4 h
O-III, 12 x 1200 s, binned 1x1 = 4 h
S-II, 6 x 1200 s, binned 2x2 = 2 h
Sunday, November 1, 2020
A supernova remnant in Cygnus, G65.3+5.7 SNR
This is a rarely imaged target, this is also one of the most difficult targets, I have ever shot. Due to a very dense star field, large angular dimension and a very diffused structure this is even more difficult target, than a Simeis 147 supernova remnant in Taurus. Total exposure time of 10h was needed to have this image. The imaging system is very fast since it's undersampled and that's good when I want capture a very large, dim and diffused targets like this one. My current imaging system, https://astroanarchy.blogspot.com/2020/01/the-frankenstein-monster-my-current.html
G65.3+5.7 SNR has about the same angular dimensions, than brighter and more famous remnant in Cygnus, the Veil Nebula. The angular dimensions are about 3x4 degrees. This is a very difficult target it has a very low surface brightness and the starfield is extremely dense in this part of the Milky Way.
NOTE, the "noise" in the photos is not a noise at all, it's glow from countless stars,
it can be seen best in full size photo!
it can be seen best in full size photo!
G65.3+5.7 SNR
Please, click for a large image, it's worth it!
There are very few images out of this dim and diffused supernova remnant around. Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen.
Note! An apparent size of the Moon in a same scale can be seen at lower left corner.
Note! An apparent size of the Moon in a same scale can be seen at lower left corner.
A closeup
click for a large image
This is a full resolution close up from the photo to show, how dense the star field really is!
O-III light alone
click for a large image
H-alpha and S-II light Only
click for a large image
Orientation in Cygnus
click for a large image
Technical details
Processing workflow
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
Tokina AT-x f2.8 camera lens
Mount
10-micron 1000
Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
5nm H-alpha 3nm S-II and 3nm O-III
Total exposure time
H-alpha, 12 x 1200 s, binned 1x1 = 4 h
O-III, 12 x 1200 s, binned 1x1 = 4 h
S-II, 6 x 1200 s, binned 2x2 = 2 h
Sunday, October 25, 2020
Exhibition, Oulu, Finland 28.10 - 15.11. 2020
EXHIBITION
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