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Tuesday, March 31, 2015

IC 1795 in the Heart Nebula




I spent hours in two nights by shooting this busy area in IC 1805, the Heart nebula, at 13. and 15. March.

IC 1795
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.


A closeup
Click for a large image





INFO

IC 1795 is also known as a Fish Head Nebula. It's a  star forming region in the northern constellation Cassiopeia at distance of about 6000 light years. My image shows about a square degree of sky, the actual size of the imaged area is around 130 light years. IC 1795 is a part of the large nebula complex known as IC 1805, the Heart Nebula.


Image in visual spectrum
Click for a large image

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.


Image in emission of an ionized hydrogen only (H-alpha)



A two frame mosaic
Click for a large image

This photo of IC 1805 was partly overlapping with my previous image from the same area.
I made a small two frame mosaic out of them. I have shot more frames after this imaging project and now I'm able to make a high resolution mosaic of the whole IC 1805 area. I'll publish that later.

This two frame mosaic is in mapped colors. I have material for the whole IC 1805 area but I'll publish it later. Blog post about the Melotte 15 at the left part of the mosaic above can be seen HERE.


Orientation in IC 1805, the Heart Nebula
Click for a large image

The area of IC 1795 is marked as a white rectangle. 


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, 3 x 1200s = 1h min.
S-II, 3 x 1200s = 1h min.
Total 7h

A single un cropped, calibrated and stretched 20 min. H-alpha frame as it comes from the camera
Click for a large image







Optikfestival in Skara, Sweden


I had a pleasure to be invited as one of the speakers in "Optikfestival Skara", Sweden. The happening was organized by a Astrosweden, a largest optics retailer in Sweden. They are specialized to Astronomy, nature photography, hunting and microscopy. I was really impressed by the passion and knowledge they have about the the optics! 

The owner, Christer  Kjellner, has a personal interest to the subject and the sales team are experienced users of the products they are selling. That's not too common now a days! No matter if you are just entering in the subject or professional user they will find a solution for you, I'm sure.

I can highly recommend Astrosweden, if you'll have any needs for Astronomy, nature photographing, hunting scopes or microscopy.

Ask for an offer or just have a look to the webshop: http://www.astrosweden.se/



Interior of the shop, they have a large stock of products on site.

Duel of the nature photographers






Tuesday, March 24, 2015

The blue dot and rings in Sh2-232



This is a followup to my previous blog post. When I was processing the data, I noticed a small nebula in center of the large complex of Sharpless 232. It seems to be the only O-III emission source in this large emission nebula. My O-III exposure was relatively short though, only 2h. The origin of this small ionization zone puzzles me. I made a small animation from integrated emission channels. No other processing, than calibration and simple un linear stretching has been done to the images.

EDIT

One mystery solved with a help from another astroguy. "Saloja" from a Finnish astro group used the Megastar database and found out, that this blue dot is a known planetary nebula, PN G173.5+03.2.  Thank you Saloja!


Narrowband image of Sh2-232 in mapped colors

Note the blue dot at middle of the photo, it's not a star but a small area of nebula emitting the O-III light.

An animation of emission channels

This animated GIF shows all three emission channels imaged for this photo, O-III, S-II and H-alpha. 
The small nebula is visible in both, H-a and O-III, S-II doesn't show it. It could be nice to understand the mechanism behind this small object. 
Is it part of the large nebula and what is the energy source for the ionization? It might even be a planetary nebula, part of the large Sh2-232 complex or a separate object front or behind it. 
Has anyone else noticed this object? Let me know, if you have some info about it.



Another interesting feature of  Sh2-232
A ring like formation

I have animated to this starless version of Sh2-232 photo, what I'm seeing in lower part of the nebula. There is a ring like formation and I'm seeing some hints of the concentric structure too.






Monday, March 23, 2015

Sharpless 232 (Sh2-232) and companions in Auriga



This was one of the most difficult targets I have shot lately, very diffused and dim. Now when the season is about to end, up here 65N, we have had clear skies one after another and I have collected exposures to unveil this target. Total exposure time is now about 24h hours. Image is a two frame mosaic.

There seems to be some interesting looking structures in this emission nebula. One of them can be seen at bottom right, just under the larger nebula. It looks like some kind of circular formation with several dim concentric layers. An other one is a very small area emitting light from an ionized oxygen (O-III) at center of the Sh2-232 at right.

Sharpless objects 232, 231, 233 and 235
Image is a two frame mosaic, 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. There is a very little an ionized oxygen, O-III, in there.

An experimental starless version

This starless image shows better the details of the actual nebula complex. (The blue dot is not a star)


A single frame closeup of Sharpless 232

Note the blue dot at middle of the photo, it's not a star but a small area of nebula emitting the O-III light.


A closeup of the blue dot at the middle

There is a small area of an ionized Oxygen (O-III) it can be seen as a blue dot at the center.

An animation

This animated GIF shows all three emission channels imaged for this photo, O-III, S-II and H-alpha. 
The small nebula is visible in both, H-a and O-III, S-II doesn't show it. It could be nice to understand the mechanism behind this small object. Is it part of the large nebula and what is the energy source for the ionization? Has anyone else noticed this object? Let me know, if you have some info about it.
EDIT

One mystery solved with a help from another astroguy. "Saloja" from a Finnish astro group used the Megastar database and found out, that this blue dot is a known planetary nebula, PN G173.5+03.2. Thank you Saloja!
INFO

Sharpless 232 (Sh2-232) large and very faint member of coplex of diffused nebulae in Auriga. One frame photo covers about a square degrees of sky. Panorama spans about 1,5 degrees horizontally. There are generally very little information about this group of nebulae.


Photo in visual colors
Click for a large image

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum and it has a very red appearance due to domination of hydrogen emission, H-alpha.


The Sh2-232 in visual colors



Orientation in wide field mosaic of the Auriga

The are of interest is marked as a white rectangle. More info about this wide field photo can be found HERE


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

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2

Astrodon filter, 5nm H-alpha
Astrodon filter, 3nm O-III
Astrodon filter, 3nm S-II

Exposure times
H-alpha, 60 x 1200s = 20h
O-III, 6 x 1200s = 2h min.
S-II, 6x1200s = 2h min.
Total 24h

A single un cropped, calibrated and stretched 20 min. H-alpha frame as it comes from the camera




Another interesting feature of  Sh2-232
A ring like formation

I have animated to this starless version of Sh2-232 photo, what I'm seeing in lower part of the nebula. There is a ring like formation and I'm seeing some hints of the concentric structure too.