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3 Carbon Stars in Lyra

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#1 The Ardent

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Posted 10 May 2021 - 11:11 PM

Saturday midnight / Sunday morning I was waiting for Nova Cas (V1405 Cas) to rise above the trees. I took a few pics of carbon stars in Lyra. No star is alone, each carbon has nearby doubles in the field. 

 

North is approximate. The sky was partly cloudy and fully overcast an hour later. 

 

 

pics taken 

9 May 2021 00:30 - 0100  EDT

85mm F=450mm refractor 

Canon M3 camera

crops of wide image ~3 degrees wide

 

 

T Lyr

15 seconds ISO 800 

 

http://stars.astro.i...u/sow/tlyr.html

 

 

BU 420

https://www.stelledo...?iddoppia=75276

 

 

Ali 377
https://www.stelledo...?iddoppia=75261

 

 

HK Lyr

13s ISO 1000

 

SLE 364

https://www.stelledo...?iddoppia=76473

 

Espin 2483
https://www.stelledo...?iddoppia=76801

 

Zeta Lyrae
https://www.stelledo...?iddoppia=76788

 

Espin 2482
https://www.stelledo...?iddoppia=76758

 

Espin 2484
https://www.stelledo...?iddoppia=76961

Attached Thumbnails

  • 1 T Lyrae.jpg
  • 2 BU 420.jpg
  • 3 Ali 377.jpg
  • 4 HK Lyr sle 364.jpg
  • 5 ESpin 2483.jpg
  • 6 Zeta Lyr es 2482.jpg
  • 7  Espin 2484.jpg

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#2 The Ardent

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Posted 10 May 2021 - 11:14 PM

U Lyrae / Espin 2489

 

13s ISO 1600

https://www.stelledo...?iddoppia=80236

 

Ali 620
https://www.stelledo...?iddoppia=80151

 

 

NGC 6791

https://en.wikipedia.org/wiki/NGC_6791

 

Ali 621
https://www.stelledo...?iddoppia=80269

 

Espin 2490
"11 fold system" none are physical
https://www.stelledo...?iddoppia=80310

 

HR 7345
https://www.stelledo...iddoppia=149747

 

Espin 2113
https://www.stelledo...?iddoppia=80164

Attached Thumbnails

  • 8 U Lyr Ali 620.jpg
  • 9 NGC 6791 Ali 620 Es 2490.jpg
  • 10 HR 7345 es 2113.jpg

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#3 c2m2t

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Posted 11 May 2021 - 10:10 AM

Hi Ray!

Those are great images. My next camera purchase will me a mirror-less variety. I have noticed a vibration on my present double scope setup that I believe is do to the mirror flop...in spite of locking up the mirror prior to exposure. I guess I need to delay the exposure another few seconds to allow the vibration to dampen down.

 

Cheers, Chris.


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#4 flt158

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Posted 11 May 2021 - 05:00 PM

Superb images, Ray. 

 

Thank you very much for each one of these. 

 

What a great idea to seek out a carbon star and see what doubles are nearby!

As far as I know there are about 7 carbon stars in Lyra which are available to us. 

 

I very much remember that guy Russ recommending ES 2482 to us 2 years ago as he had observed it. 

And so I sought it out and my William Optics 158 mm F/7 apochromatic refractor separated it at 225X. 

Such sweet memories!

 

By the way, I have succeeded in finding that thread you are looking for. 

Please check your private message. 

 

Very best regards from Aubrey. 


Edited by flt158, 11 May 2021 - 05:06 PM.

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#5 Tyson M

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Posted 12 May 2021 - 04:29 PM

Nice images Ray!


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#6 fred1871

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Posted 13 May 2021 - 01:39 AM

Hi Ray!

Those are great images. My next camera purchase will me a mirror-less variety. I have noticed a vibration on my present double scope setup that I believe is do to the mirror flop...in spite of locking up the mirror prior to exposure. I guess I need to delay the exposure another few seconds to allow the vibration to dampen down.

 

Cheers, Chris.

Chris, the vibration could be from the shutter, rather than mirror shock. I've seen reviews of several mirrorless cameras in recent times where shutter shock produced vibration, most obvious at particular shutter speeds. It was eliminated using the camera's  electronic shutter instead of the mechanical one.

 

 



#7 c2m2t

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Posted 13 May 2021 - 08:53 AM

Hi Fred!

Thanks for that knowledge. I will have some more informed opinions after last nights imaging session...I gave a full 8 to 10 seconds after mirror lift before starting the exposure. Just need to find some time to study them in detail. This, finally....nice weather has me choring outside.

 

Cheers, Chris.


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#8 ssmith

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Posted 13 May 2021 - 09:51 AM

Hi Chris -

 

I agree with Fred that it is likely the mechanical shutter causing the problem.  

 

If your camera doesn’t have an electronic shutter some camera models will let you disable the first stage (or put in a delay before activating the second-stage) of a two-stage mechanical shutter which can help reduce the vibration.


Edited by ssmith, 13 May 2021 - 11:00 AM.


#9 The Ardent

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Posted 13 May 2021 - 02:55 PM

Chris 

When I purchased the Canon M3 in 2017 I had no idea what a mirrorless camera was . My only complaint is I can’t get it connected to a laptop for whatever reason, but that’s another topic. 

 

The whole idea was to capture stars I had already observed. It turned into finding really obscure designations. Five years ago I probably could name only the popular discoverer names, like Struve , Burnham, Herschel etc, . 
 

I’m not big into imaging, but doubles seem to work for me. 
 

Look at the KEH site for used mirrorless cameras. There are some older inexpensive ones with smaller sensors. I don’t think you need a large sensor for doubles. Make sure telescope adapter is available for whatever brand you like. 

Hi Ray!

Those are great images. My next camera purchase will me a mirror-less variety. I have noticed a vibration on my present double scope setup that I believe is do to the mirror flop...in spite of locking up the mirror prior to exposure. I guess I need to delay the exposure another few seconds to allow the vibration to dampen down.

 

Cheers, Chris.

 



#10 c2m2t

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Posted 14 May 2021 - 09:18 AM

Good Morning Gentleman!

I won't say that the evidence is totally conclusive, but if I was a betting man, I would say that mirror flop is the culprit. After 2 nights of imaging about 60 to 70 Flamsteed stars a-focally and providing a 5 to 8 second pause before tripping the shutter, the vibration artifact has not resurfaced. Even more basic, if I was to close my eyes and just respond to the two sounds that the mirror and the shutter make, I would place both hands on the side of the mirror sound. The sound generated by the shutter is about 25% of that produced by the mirror. This is a Canon T2i camera with  a relatively low shutter activation count. Given this, I will continue to provide the 5 to 8 second delay between mirror lift and shutter release. I would venture a guess that the mass of the mirror is greater than the shutter mechanism. My old film based dslr's have a very similar sound...but the mirror reflex was even noisier.

 

Ray...I read over the specifications for your Canon M3 and it can be connected to a computer like most Canons can...they have a proprietary software for controlling the shutter and ISO and likely other things. I myself have never used it..but have several CD's with the software. You can control yours with a smart phone as well...I believe I read that Canon has an app to do that...likely similar to the computer control software. I have a small 7 inch LCD screen that  I use to preview my images. It is hard wired to the camera. It works well. I got a bit smarter after that first season of imaging double stars...most of the night spent on my knees in the pod trying to crane my neck to view the tiny screen on the Canon 350D that I use for my double star imaging camera.

 

In any case, I enjoy your images. I find imaging not only gives me a record of what I have observed but allows me to experience other things that the eyepiece has difficulty revealing...especially if your local seeing, like mine, is generally crappy!! frown.gif grin.gif

 

Cheers, Chris.



#11 JimP

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Posted 15 May 2021 - 04:22 PM

Red dwarf vs Carbon star. What is the difference?

 

JimP


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#12 The Ardent

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Posted 15 May 2021 - 04:58 PM

The answer is more complicated than simple broad category labels.

https://en.m.wikiped...iki/Carbon_star


Red dwarf vs Carbon star. What is the difference?

JimP


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#13 Bonco2

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Posted 16 May 2021 - 03:25 PM

I used to do high power photo's with a SLR. to minimize vibration I'd place a black cardboard card in front of the telescope. open the shutter count to 10 or so seconds then remove the card. Once you exposed enough, place the card in front again and close the shutter... Primitive but it works. Got pictures of Pluto that way.

Bill


Edited by Bonco2, 16 May 2021 - 03:26 PM.

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