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Saturday, December 8, 2018

The Giant Cosmic Squid, Ou4, scale in the sky and a zoom in series

Sometimes it's hard to understand the actual scale and locations of cosmical objects from a photograph. I tend to shoot same objects with a very different focal lengths usually from 200mm up to 3000mm. Form that image material I'm able to build "zoom in series" of the cosmical objects. By that way it's easier to understand the actual scale and location in the sky.

Zooming in to the Ou4, the Squid Nebula in Cepheus
Please, click for a large image




More info and images about Ou4, the Squid nebula

INFO CAN BE SEEN HERE
https://astroanarchy.blogspot.com/2018/12/the-giant-cosmic-squid-nebula-au4-new.html







Wednesday, December 5, 2018

Grande mosaic of Cygnus in visual colors, 18-panels, 150 hours and 22 x 14 degrees of sky


Yesterday I published a mapped color version of this nebula complex, here is the version in visual spectrum.

I have originally published this image back at December 9, 2011 After that I have shot many details out of this are of sky with much longer focal length instrument. Mainly with Celestron Edge 11" reflecting telescope. I have now updated this photo with a new image material and I thought, that it's a good time to republish this updated image again.

The Great mosaic image of constellation Cygnus has 18 individual panels stitched together seamlessly. Each panel has shot three times for a color image. First I shot the light from an ionized hydrogen (H-alpha), then light from an ionized sulfur (S-II) and last the light from an ionized oxygen (O-III). The final image has a resolution of 15.000 x 10.000 pixels. I shot all frames with the Canon EF 200mm f1.8 camera optics at full open, QHY9 astrocam and Baader narrowband filter set.

There are no noise reduction, star reduction or sharpening used for this mosaic. It's very well in focus due to temp compensating focuser I made for this lens. (At f1.8 the critical focus zone is about 7 metric microns.)

Grande mosaic of Cygnus in natural colors
Please, click for a large image, it's worth it! (3600 x 2300 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. 



A full 1:1 scale details from the mosaic image above
Please, click for a large image, it's worth it! (2000 x 2000 pixels)

A full 1:1 scale detail from the upper left corner of the mosaic image, lots of stars up there!



A full 1:1 scale detail from the middle right of the Cygnus mosaic image.


Wonders of Swan

I have made a collection out of the photos I have shot from this area of the sky. I have used 517 hours of exposure time to capture details from Cygnus between 2009 and 2018. I used this material to update my mosaic image of the Cygnus constellation. Full listing and detailed information can be found from here: https://astroanarchy.blogspot.com/2018/11/treasures-of-swan.html


Orientation in the sky
Click for a large image








Tuesday, December 4, 2018

Grande mosaic of Cygnus, 18-panels, over 150 hours and 22 x 14 degrees of sky



I have originally published this image back at December 9, 2011 After that I have shot many details out of this are of sky with much longer focal length instrument. Mainly with Celestron Edge 11" reflecting telescope. I have now updated this photo with a new image material and I thought, that it's a good time to republish this updated image again.

The Great mosaic image of constellation Cygnus has 18 individual panels stitched together seamlessly. Each panel has shot three times for a color image. First I shot the light from an ionized hydrogen (H-alpha), then light from an ionized sulfur (S-II) and last the light from an ionized oxygen (O-III). The final image has a resolution of 15.000 x 10.000 pixels. I shot all frames with the Canon EF 200mm f1.8 camera optics at full open, QHY9 astrocam and Baader narrowband filter set.
There are no noise reduction, star reduction or sharpening used for this mosaic. It's very well in focus due to temp compensating focuser I made for this lens. (At f1.8 the critical focus zone is about 7 metric microns.)

Grande mosaic of Cygnus
Please, click for a large image, it's worth it! (3600 x 2300 pixels)


Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen.


Original 1:1 size detail from the mosaic image above
Please, click for a large image, it's worth it! (2700 x 1700 pixels)




Orientation in the sky
Click for a large image



Wonders of Swan

I have made a collection out of the photos I have shot from this area of the sky. I have used 517 hours of exposure time  to capture details from Cygnus between 2009 and 2018. I used this material to update my mosaic image of the Cygnus constellation. Full listing and detailed information can be found from here: https://astroanarchy.blogspot.com/2018/11/treasures-of-swan.html

Klick for a very large image 5500 x 3300 pixels




Chinese Dragon Nebula 
Click for a large image

The very large, 18-panels, mosaic of the Cygnus was my main work at Autumn season 2011.
I named it to the Chinese Dragon Nebula due to reason seen in the image above.
Image spans 22 degrees horizontally. (22 degrees = 44 full Moons side by side in the sky)








Monday, December 3, 2018

The Giant Cosmic Squid Nebula, Au4, 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. 


Ou4, the Giant Squid (Giant indeed, it's 50 light years across)
Please, click for a large image


Natural color scheme from the emission of an ionized elements, H-a, S-II and O-III. This is a very large nebula, this image spans vertically about 1.5 degrees = three full Moons side by side in a sky.



Ou4 in light of an ionized oxygen alone, O-III
Please, click for a large image


This photo shows only the O-III channel. The Squid Nebula is visible only at light of an ionized oxygen, O-III



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.


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.



Ou4, the Giant Squid in mapped colors
Please, click for a large image

Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen.



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

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.