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Supernova Remnant G65.3+5.7 with a Vintage SMC Pentax-M 135/3.5 lens

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#1 Pete_xl

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Posted 05 August 2022 - 04:06 PM

Hi folks,

 

I've been hanging around this 4.5° wide structure in Cygnus all summer. With its faint narrowband emissions and the mass of stars it's a challenge, but nevertheless it was doable even on bright nights. After it came to nothing with the mosaic with the small refractor and I then imaged Sh2-91/94/96 with the large refractor (130/910 mm at f/5.75), it appealed to me to try to get the whole structure on the sensor. The first attempt was made with a historic Carl Zeiss 180/2.8, but the coma on the stars put me off and I then tried it with an SMC Pentax-M 135/3.5 from the 70s of the last century. Even with that, the stars looked terrible, though I stopped down to f/5.6. However, stacking straightened it a bit, so I dare to post the result here.

 

SNR G65.3+5.7 in the constellation Swan is huge ( 9 x bigger than the Moon!) and nicely structured. The brighter parts were thought to be indepensent single structures until Gull et al. discovered  the true nature of the object in 1977.

 

I won't be shooting RGB stars because I think the narrow band stars look better with this lens and the very high stellar density of the region. Instead, I will still try to catch the northeast corner of the SNR with the large refractor. There seems to be very nice filigree OIII structures there. However, as far as I know, the corner does not have a name.

 

Enough written, here is the image:

 

52265167019_8d6c62c153_h.jpg

 

Full resolution and annotations are here: https://astrob.in/ay0our/0/

 

  1659726381648.png

 

I hope you like it - comments and criticism welcome as always!

 

Cheerd

Pete

 

Data:

Hemisphere: Northern · Constellation: Cygnus (Cyg)

Contains: IC 1302 · IC 1303 · LBN 144 · LBN 147 · LBN 148 · LBN 150 · LDN 794 · LDN 795 · LDN 799 · LDN 800 · LDN 803 · LDN 806 · LDN 807 · LDN 808 · LDN 810 · LDN 811 · LDN 812 · LDN 813 · LDN 815 · LDN 816 · LDN 817 · LDN 819 · LDN 821 · LDN 828 · NGC 6813 · PK061+03.1 · PK066+02.2 · PK071+04.1 · Sh2-91 · Sh2-92 · Sh2-94 · Sh2-96

Equipment:
Imaging Telescopes Or Lenses Pentax SMC Super Takumar 135mm f/3.5
Imaging Cameras ZWO ASI2600MM Pro
Mounts Sky-Watcher EQ8-R
Filters Astronomik H-alpha CCD 6nm · Chroma OIII 3nm Bandpass
Software Adobe Photoshop · Aries Productions Astro Pixel Processor (APP) · Stefan Berg Nighttime Imaging 'N' Astronomy (NINA)
Acquisition details
Dates:Aug. 2, 2022 · Aug. 3, 2022
Frames:
Astronomik H-alpha CCD 6nm: 25x600" (4h 10')
Chroma OIII 3nm Bandpass: 29x600" (4h 50')
Integration:9hAvg. Moon age:4.92 daysAvg. Moon phase:25.10%
RA center: 19h34m46s.48
DEC center: +31°32′13″.1
Pixel scale: 5.726 arcsec/pixel
Orientation: 1.756 degrees
Field radius: 6.018 degrees
Resolution: 4215x6280
File size: 29.7 MB
Data source: Backyard


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#2 Older Padawan

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Posted 05 August 2022 - 04:12 PM

Fantastic Image. Thanks for sharing.bow.gif


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#3 R Botero

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Posted 06 August 2022 - 01:29 AM

Great image Pete! The FOV is huge. 😎

Roberto
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#4 Fegato

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Posted 06 August 2022 - 02:06 AM

wonderful!


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#5 Mert

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Posted 06 August 2022 - 04:39 AM

That's a massive field of view, with great structures and great color.

Those OIII structures are amazing.


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#6 airscottdenning

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Posted 06 August 2022 - 07:26 AM

Wonderful image! A familiar part of the sky with a completely different perspective!


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#7 Jim Thommes

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Posted 06 August 2022 - 06:53 PM

Beautiful picture Pete! The field is very well composed in this wide context. I did a *very* small portion of this structure - Sh2-91 portion - the brighter area  at the southern end a while back. It is an OK field, but this full structure image is spectacular.

 

I do have a NB setup now that will give me 6.7x5.1 degree field at 5.2"/pix image scale. I think it will fit and it sorta matches your image scale. I have some other projects occupying my time right now - so I think I will go for it next year.


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#8 j.gardavsky

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Posted 07 August 2022 - 08:30 AM

Hello Peter,

 

this is a fantastic wide field, showing also the very large LBN 162 to the E, and the mighty Sh2-92 to the SE !

Exactly what I wanted to see.

 

Thank you so much,

Jiri


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#9 Pete_xl

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Posted 08 August 2022 - 10:44 AM

Beautiful picture Pete! The field is very well composed in this wide context. I did a *very* small portion of this structure - Sh2-91 portion - the brighter area  at the southern end a while back. It is an OK field, but this full structure image is spectacular.

 

I do have a NB setup now that will give me 6.7x5.1 degree field at 5.2"/pix image scale. I think it will fit and it sorta matches your image scale. I have some other projects occupying my time right now - so I think I will go for it next year.

Hi Jim and thank you very much - glad you like the image! Taking the old 135/3.5 was only the second best plan I had for this summer project after I gave up in the tilt-fight with my 80/480 mm with reducer. But it was worth trying it because the filaments in this mighty structures are so beautiful.

Your 6.7° x 5.1° fov should be perfectly fine for a landscape frame I think. Just be careful not to cut off the weak Oiii in the northwest wink.gif .

 

CS Pete



#10 Pete_xl

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Posted 08 August 2022 - 10:47 AM

Hello Peter,

 

this is a fantastic wide field, showing also the very large LBN 162 to the E, and the mighty Sh2-92 to the SE !

Exactly what I wanted to see.

 

Thank you so much,

Jiri

Hi Jiri, 

 

thank you very much! The last deep view I took from SNR G+65.3+5.7 (the NE part) is also in the box. I plan take the  the RGB data tonight.

 

Pete


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#11 j.gardavsky

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Posted 08 August 2022 - 02:44 PM

Hi Jiri, 

 

thank you very much! The last deep view I took from SNR G+65.3+5.7 (the NE part) is also in the box. I plan take the  the RGB data tonight.

 

Pete

Hello Peter,

 

this would be very interesting, and aslo if you can capture the molecular clouds further to the NE, I have seen years ago.

 

Thank you, and with my best regards,

Jiri




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