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Winter and Summer Milky-way in H-alpha

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#1 mandarpotdar

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Posted 12 March 2019 - 04:42 AM

This weekend I captured the Orion arm and the core + Cygnus arm of Milky-way using H-alpha narrowband filter to show all the H-II regions (https://en.wikipedia...iki/H_II_region) here.

 

combined_s.jpg

(Higher resolution: https://drive.google...xAHGgH2jBFQZJp)

 

I think this will be helpful to folks who want to photograph these objects. The relative brightness of all objects can be compared in these images as everything is at same exposure.
Need to annotate the images for it to be more useful.

 

Full resolution tiff images are here:

summer1.tiff (https://drive.google...85jWWQ7veh8h7j1) (81MB)

winter.tiff (https://drive.google...iGSkQvgu8ViT4Po) (95MB).

 

Captured using ZWO ASI 1600-mono-cooled camera, ZWO H-alpha filter and using the humble Canon 18-55mm kit lens @18mm and wide open.
Mount: Orion Sirius EQ-G, unguided.

 

6 frame panorama for winter, 4 frame panorama for summer.
Each “frame” is a stack of 7 to 18 images, each of 3min exposure.

Calibration and stacking in DSS, stitching done in Microsoft ICE.

 

C&C welcome.

 

Regards,

Mandar

 


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#2 descott12

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Posted 12 March 2019 - 08:06 AM

That is amazing! Nice work. Really awesome!



#3 Araguaia

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Posted 12 March 2019 - 08:21 AM

Beautiful!   A guide for observing with low power.



#4 Araguaia

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Posted 12 March 2019 - 08:22 AM

Where near Mumbai do you have such skies?



#5 mandarpotdar

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Posted 12 March 2019 - 10:25 AM

This is from near Velhe, near Pune.
Precisely:
Go Agri Organic Farm
136 Kolambi, SH65, Varoti Kh., Maharashtra 412212
099220 19222
https://maps.app.goo.gl/UQfzJ

#6 Jeff2011

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Posted 12 March 2019 - 10:34 AM

Can't say I have seen a wide angle image in Ha before.  Nicely done.   I just recently picked up a 10-18 Canon lens for a trip to South Dakota. Your image gives me an idea for a future project.



#7 BenKolt

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Posted 12 March 2019 - 11:04 AM

That's a neat, unique image.  Well done.  It took me a few moments to orient myself, but once I did I could see lots of neat things across the wide views.


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#8 lucam

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Posted 12 March 2019 - 11:08 AM

That's so cool! Thank you for putting it together and sharing it.



#9 descott12

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Posted 12 March 2019 - 11:08 AM

This is amazing....I am still not sure what I am looking at in the top view? Is that what you are calling the Orion Arm?



#10 mandarpotdar

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Posted 12 March 2019 - 11:35 AM

Thanks for the comments.

@descott12: Yes, that's the Orion arm.

 

Now that I searched, we should talk in terms of this: https://en.wikipedia...Way#Spiral_arms



#11 mandarpotdar

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Posted 12 March 2019 - 11:41 AM

The motivation for this project was when I newly acquired the mono-cooled camera and narrowband filters, I started looking for objects which emit in H-alpha. Many of these areas do not have popular names (like Messier objects) and the brightness info is even less available.

For eg, it is not easy to get that Cone Nebula is very much fainter than Rosetta. The only way was to look at images on astrobin and check what exposure is used, and deduce from that.

This image will give a ready comparison for brightness and size. Of course, as I said earlier, I need to annotate them too.

 

Note that both these images were captured in a single night.


Edited by mandarpotdar, 12 March 2019 - 11:42 AM.


#12 mandarpotdar

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Posted 12 March 2019 - 11:46 AM

@descott12

In the top image, at right you have Cassiopeia. See the Heart and Soul nebulae and double cluster next to it.

As you move left, there is Auriga, Orion, Canis Major, Puppies and Carina. At very left end, you see the majestic Eta Carina nebula. Just compare its size with the great Orion nebula smile.gif .


Edited by mandarpotdar, 12 March 2019 - 11:47 AM.


#13 descott12

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Posted 12 March 2019 - 11:48 AM

Thanks for the comments.

@descott12: Yes, that's the Orion arm.

 

Now that I searched, we should talk in terms of this: https://en.wikipedia...Way#Spiral_arms

Now I see it. You can even make out the horsehead! Amazing!!! Thanks for posting this. I have never been interested in AP until now...and this was a relatively short exposure.



#14 2ghouls

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Posted 12 March 2019 - 11:48 AM

WOW! I don't think I've ever seen a winter milky way shot that extends from Heart/Soul to Carina! Great job!! I love seeing the extent of the Gum Nebula, and the relative sizes of both "northern hemisphere objects" and "southern hemisphere objects" in one shot. Makes me wish I was closer to the equator. 

 

Cheers, Nico



#15 mandarpotdar

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Posted 12 March 2019 - 11:51 AM

Now I see it. You can even make out the horsehead! Amazing!!! Thanks for posting this. I have never been interested in AP until now...and this was a relatively short exposure.

This is a highly scaled down version. Try looking at the tiff images linked in original post wink.gif .



#16 descott12

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Posted 12 March 2019 - 11:53 AM

This is a highly scaled down version. Try looking at the tiff images linked in original post wink.gif .

I downloaded both of them. Fantastic!



#17 Araguaia

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Posted 12 March 2019 - 12:40 PM

 Makes me wish I was closer to the equator. 

 

 

 

We have the only true equatorial mounts!



#18 calypsob

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Posted 12 March 2019 - 12:49 PM

Thats a great presentation Mandar, Id love to see a higher resolution version on gigapan or flickr.



#19 bmhjr

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Posted 12 March 2019 - 02:15 PM

Great job on putting this together. It is a really nice image and reference.

 

Bill



#20 elmiko

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Posted 12 March 2019 - 06:18 PM

Great job Mandar. You obviously dedicated a lot of time on this work. Bravo!

Mike



#21 mandarpotdar

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Posted 12 March 2019 - 11:15 PM

Great job Mandar. You obviously dedicated a lot of time on this work. Bravo!

Mike

Thanks Mike. Both these images are captured in a single night. It is much easier than it seems.

~Mandar



#22 AKHalea

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Posted 13 March 2019 - 05:17 PM

Mandar : Very innovative and new way to look at the Milky Way. Barnard's Loop and Meissa nebula in Orion show up very nicely as big objects. Also, this northern observer got to see where the Carina nebula is in the Milky Way. Thanks for posting these wonderful images .... Anil 




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