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Observation of the close satellite Dubhe (0.82 ") α UMa A + B

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#1 Konstantin 1980

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Posted 05 December 2021 - 06:46 AM

This morning the clouds are gone (Tambov, Russia), closer to morning the atmosphere has become quite calm. I decided to observe both visually and photographically close binaries. I watched and filmed a lot.

One of the results was a successful photo of the star Dubhe and its companion. According to the data to date, the separation is today about 0.82 ", with a brightness difference of magnitude 3. The satellite is visible visually at 254 mm at a magnification of about 500 times, moments, however, due to the not sufficiently calm picture of diffraction rings, one has to wait . But be that as it may, the result is excellent. As a result, the satellite is clearly visible as a disk at 2 o'clock in the photo., which I actually represent. I shot on a telescope with a Dobson mount! automated equatorial platform (homemade)05_57_55_дубхе b.jpg


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#2 Konstantin 1980

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Posted 05 December 2021 - 11:36 AM

ДУБХЕ.jpg


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#3 Bigzmey

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Posted 07 December 2021 - 09:28 PM

Great capture Konstantin!



#4 Astrojensen

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Posted 08 December 2021 - 12:09 PM

Extremely impressive! Both visually and photographically. 

 

I tried spotting the companion last year in my 6" f/8 ED at 510x, but without success, despite very good seeing. 

 

 

Clear skies!

Thomas, Denmark


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#5 Cotts

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Posted 23 December 2021 - 06:52 PM

Well done.  I will certainly try this one visually with my new 20" Dob (when it finally arrives....)

 

Dave


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#6 Cotts

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Posted 24 December 2021 - 09:27 AM

This morning the clouds are gone (Tambov, Russia), closer to morning the atmosphere has become quite calm. I decided to observe both visually and photographically close binaries. I watched and filmed a lot.

One of the results was a successful photo of the star Dubhe and its companion. According to the data to date, the separation is today about 0.82 ", with a brightness difference of magnitude 3. The satellite is visible visually at 254 mm at a magnification of about 500 times, moments, however, due to the not sufficiently calm picture of diffraction rings, one has to wait . But be that as it may, the result is excellent. As a result, the satellite is clearly visible as a disk at 2 o'clock in the photo., which I actually represent. I shot on a telescope with a Dobson mount! automated equatorial platform (homemade)attachicon.gif05_57_55_дубхе b.jpg

May I ask what the photograph parameters were?  Type of camera and its pixel size, focal length, ISO...  also is this a stack of many frames from a video or a single frame.  What frame exposure did you use?

 

Thanks.  I hope one day to take pictures of close binaries as good as this one.

 

Dave
 



#7 R Botero

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Posted 25 December 2021 - 03:04 AM

Very impressive Konstantin waytogo.gif

 

Roberto



#8 Konstantin 1980

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Posted 29 December 2021 - 03:47 PM

May I ask what the photograph parameters were?  Type of camera and its pixel size, focal length, ISO...  also is this a stack of many frames from a video or a single frame.  What frame exposure did you use?

 

Thanks.  I hope one day to take pictures of close binaries as good as this one.

 

Dave
 

I got this image in the following way. I used a 254mm telescope (Newton) on a Dobson mount (on the equatorial Dobson platform). Astro camera Datison t7, the video contained 5 thousand frames, I used 1 thousand. I also used two Barlow lenses, 3 x and 2 x (at the same time)

 

the satellite cannot be identified in single frames, it is visible only after adding the frames


Edited by Konstantin 1980, 29 December 2021 - 03:49 PM.

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#9 Cotts

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Posted 29 December 2021 - 04:13 PM

That's a very long focal length.  Assuming your telescope is f/6 then the two barlows combine to make the focal length f/36!  9 144mm

 

Your image scale is very close to 0.01" per pixel....

 

I will have to try using a longer focal ratio with my Mewlon 210 f/11.5 (approx. 2400mm).  

 

Thanks,

 

Dave



#10 Konstantin 1980

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Posted 29 December 2021 - 04:40 PM

That's a very long focal length.  Assuming your telescope is f/6 then the two barlows combine to make the focal length f/36!  9 144mm

 

Your image scale is very close to 0.01" per pixel....

 

I will have to try using a longer focal ratio with my Mewlon 210 f/11.5 (approx. 2400mm).  

 

Thanks,

 

Dave

 

I am using a telescope with a focal length of 1200  ( Sky-Watcher Dob 10" (250/1200))   , it is difficult to say how much the final focal length will be, since there is a distance between the barlow lenses. But I can measure an Airy disk




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