Monday, December 3, 2018
The Giant Cosmic Squid Nebula, Ou4, new compositions
I have published my photo of the Giant Squid Nebula. Au4, earlier at November 28. I made a new composition out of the same material, it's little more dynamic now, I think.
I started this imaging project at this autumn season and after a several months I got it ready!
This is a dimmest target I have shot so far! Total exposure time for the light from an ionized oxygen (O-III) alone was around 35h. Most of the data was shot at binned down to 4x4! For some details I shot about ten hours of 2x2 binned data. H-a is brighter but not bright either. There is about ten hours of H-alpha light exposed. There is very little light from an ionized sulfur, I shot bin 4x4 data about three hours for S-II. Total exposure time used is around 48h
The Celestron Edge 11" telescope with a 0.7 focal reducer has a perfect field of view for this object. This combo delivers a very high quality image from edge to edge. The Apogee U16 can be very challenging to have a good orthogonality and collimation due to very large CCD-shell.
Here is some optical analysis to see, https://astroanarchy.blogspot.com/2014/10/a-start-of-new-project-tulip-nebula.html
Ou4, the Giant Squid (Giant indeed, it's 50 light years across)
Please, click for a large image
Ou4 in light of an ionized oxygen alone, O-III
Please, click for a large image
Wider field of views, Ou4 inside the Sharpless 129
Please, click for a large image
An older photo of Sharpless 129 is combined with a new data. Image is in natural color palette.
This photo of Sharpless 129 was taken with Tokina AT-X 300mm f2.8 camera optics, QHY9 astrocam and the Baader narrowband filter set, H-alpha, S-II and O-III.
This photo of Sharpless 129 was taken with Tokina AT-X 300mm f2.8 camera optics, QHY9 astrocam and the Baader narrowband filter set, H-alpha, S-II and O-III.
Even wider field of view shows the IC 1396
Note, there is a white circle at lower right corner showing an apparent size of the full moon at same scale. (Moon has an angular diameter of 0,5 degrees.) Ou4 and companions are very large objects!
This is a four panel mosaic image of constellation kepheus, taken with Canon EF 200mm f1.8 camera optics, QHY9 astronomical camera and the Baader narrowband filter set, H-alpha, S-II and O-III.
Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen.
H-alpha, 30 x 1200 s, binned 2x2 = 10 h
O-III, 105 x 1200 s, binned 4x4 = 35 h.
S-II, 9 x 1200 s. binned 4x4 = 3 h
Total exposure time, 48h
This is a four panel mosaic image of constellation kepheus, taken with Canon EF 200mm f1.8 camera optics, QHY9 astronomical camera and the Baader narrowband filter set, H-alpha, S-II and O-III.
Ou4, the Giant Squid in mapped colors
Please, click for a large image
INFO
The giant Squid Nebula cataloged as Ou4. Nebula was discovered in 2011 by French astro-imager Nicolas Outters, the Squid Nebula's alluring bipolar shape is distinguished here by the telltale blue-green emission from doubly ionized oxygen atoms. The true distance and nature of the Squid Nebula have been difficult to determine. Still, a recent investigation suggests Ou4 really does lie within Sh2-129 some 2,300 light-years away. Consistent with that scenario, Ou4 would represent a spectacular outflow driven by HR8119, a triple system of hot, massive stars seen near the center of the nebula. The truly giant Squid Nebula would physically be nearly 50 light-years across.
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
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, 30 x 1200 s, binned 2x2 = 10 h
O-III, 105 x 1200 s, binned 4x4 = 35 h.
S-II, 9 x 1200 s. binned 4x4 = 3 h
Total exposure time, 48h
A single 20 min. calibrated and stretched 4x4 binned O-III exposure
Please, click for a large image
4x4 binned O-III frame is divided with a bias corrected master flat and subtracted with a master dark. Even after a heavy stretching, very little can be seen in this single 20 min. 4x4 binned light frame.
Saturday, December 1, 2018
16 panel mosaic image of North America & Pelican nebula in visual colors
I have publish this photo earlier as a mapped color version, it can be seen HERE
While shooting lights for my Giant Cosmic Squid project, I had to wait few hours every night to the Ou4 to be well placed in the sky. I spent those hours to shoot some frames for North America and Pelican Nebula area. I have shot many details from this area , while making my poster about Treasures of the Swan I noticed that there are many overlapping photos. I shot few missing parts and finally I was able to build a mosaic image from that material.
16-panels are now combined seamlessly to a very high resolution image. Each frame is shot three times, one exposure set for the light emitted by an ionized hydrogen (H-alpha), second set for the light emitted by an ionized sulfur (S-II) and third set for the ionized oxygen. (O-III) Total exposure time used for this image combo is just under 200h! The original resolution is around 16.000 x 16.000 pixels. Frames for this mosaic image are taken between 2014-2018 and I have published many of them them as an individual compositions.
The Grande Mosaic of the North America and Pelican Nebula
Please, click the image to see a large version, it's worth it! (2000x2000 pixels)
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. All photos are shot with a Celestron EDGE 11" reflecting telescope, Apogee Alta U16,a cooled astrocam and the Astrodon narrowband filter set. Photos are shot between the years 2014 and 2018, total exposure time is around 200h.
Details from the image above
Please, click the image to see a large version
Nebula in light from an ionized hydrogen lone (H-alpha)
Please, click the image to see a large version
Orientation
Please, click the image to see a large version
Friday, November 30, 2018
Dark dust in Cygnus
Mosaic images needs usually a lots of work and time to be ready. Nothing can beats the resolution of a good mosaic image of the large cosmic object. Since it can take even years to have a finalized photo, I'm trying to shoot subframes of the mosaic image as an individual artworks. many of my mosaic images have been published first as a series of subimages, acting as an individual artworks
Here is one of those subimages, dark dust clouds of Cygnus. It's a part of large Cygnus nebula complex. More accurately, a part of dust ridge dividing North America and Pelican Nebulae.
Please, click for a large photo
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.
Position in the large 16 panel mosaic image of NA and Pelican Nebula
Please, click for a large photo
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
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
Total exposure time for the whole 16 panel mosaic image is around 200 hours.
The Giant Cosmic Squid in Mapped colors
I started this imaging project at this autumn season and after a several months I got it ready!
I have published a natural color version few days ago, the result can be seen HERE.
This is a dimmest target I have shot so far! (At end of the post, there is a single 20 min subframe od O-II light.) Total exposure time for the light from an ionized oxygen (O-III) alone was around 35h. Most of the data was shot at binned down to 4x4! For some details I shot about ten hours of 2x2 binned data. H-a is brighter but not bright either. There is about ten hours of H-alpha light exposed. There is very little light from an ionized sulfur, I shot bin 4x4 data about three hours for S-II. Total exposure time used is around 48h
The Celestron Edge 11" telescope with a 0.7 focal reducer has a perfect field of view for this object. This combo delivers a very high quality image from edge to edge. The Apogee U16 can be very challenging to have a good orthogonality and collimation due to very large CCD-shell.
Here is some optical analysis to see, https://astroanarchy.blogspot.com/2014/10/a-start-of-new-project-tulip-nebula.html
Ou4, the Giant Squid (Giant indeed, it's 50 light years across)
Please, click for a large image
Ou4 in light of an ionized oxygen only
Please, click for a large image
Wider field of views, Ou4 inside the Sharpless 129
Please, click for a large image
The location in the sky as a relation to the IC 1396
INFO
The giant Squid Nebula cataloged as Ou4. Nebula was discovered in 2011 by French astro-imager Nicolas Outters, the Squid Nebula's alluring bipolar shape is distinguished here by the telltale blue-green emission from doubly ionized oxygen atoms. The true distance and nature of the Squid Nebula have been difficult to determine. Still, a recent investigation suggests Ou4 really does lie within Sh2-129 some 2,300 light-years away. Consistent with that scenario, Ou4 would represent a spectacular outflow driven by HR8119, a triple system of hot, massive stars seen near the center of the nebula. The truly giant Squid Nebula would physically be nearly 50 light-years across.
A single 20 min. calibrated and stretched 4x4 binned O-III exposure
Please, click for a large image
Image is divided with a bias corrected flat frame and subtracted with master dark. Even after a heavy nonlinear stretching, very little can be seen in this single 20 min. 4x4 binned light frame.
Animation
Please, click for a large image
This animated GIF shows the Giant Squid Nebula with all three channels, H-alpha, S-II and O-III versus just the light from an ionized oxygen, O-III
Animation
Please, click for a large image
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