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Izar at last

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#1 azure1961p

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Posted 10 August 2019 - 10:47 AM

With the C90, I tried for this a week ago and the collimation had shifted so the diffraction rings were askew and as a result the companion was lost in the mix. Last nite I corrected the collimation spot on and here's Izar proper through the aligned system. The 8" newt by comparison naturally shows a smaller airy for both stars and greater color in both with the companion like a blue spark of light .  Later on I got a beautiful Epsilon Lyrae but that's a drawing for another time. They were cleanly split with magnitudes showing their slight differences. Delicate views.

 

Pete

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Edited by azure1961p, 11 August 2019 - 09:02 AM.

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#2 Roragi

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Posted 10 August 2019 - 11:57 AM

Pete,

 

An interesting double star, a great job in the performance.

 

Roberto.



#3 niteskystargazer

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Posted 10 August 2019 - 02:22 PM

Pete,

 

Nice sketch of Izar at last smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#4 flt158

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Posted 10 August 2019 - 05:19 PM

Very good sketch, Pete.

Your colours are spot on. 

 

One of my very favourite binaries. 

I only observed 9 nights ago.

My sky was quite good considering I live in a Bortle 9 zone. 

Split Izar at a mere 112X through my William Optics 158 mm apochromatic refractor. 

Looked very good at 140X and 167X too. 

Pickering must have been around 7. 

 

Clear skies from Aubrey. 



#5 azure1961p

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Posted 11 August 2019 - 09:06 AM

Aubrey,

 

I didn't see how low I could go but just ramped it up for the look see.  It's interesting that the observation the other week where the collimation had a clear bias in the in focus stars, the chaos of it masked this component amount shards of diffraction rings dancing about. Once the bullseye became apparent so to then the Ashen grey companion emerged.  Really really really reminded me of how Lambda Cygni looks through my 8" and 312x.  Again that Ashen blue companion , albeit brighter!

 

Cheers,

 

Pete


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#6 flt158

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Posted 11 August 2019 - 09:51 AM

Thank you, Pete, for reminding me about Lambda Cygni. 

It might be 3 years since I successfully split it at 320X in my Williams Optics 158 mm apochromatic refractor. 

It must be time to give it another go.

 

Right now the northern part of Aquila is begging for my attention. 

There are a host of doubles and triples awaiting me there in and around NGC 6709 open cluster. 

I'll keep everyone posted when I do enter that Eagle constellation on the double star forum. 

All I need is one clear night. 

 

Kindest regards from Aubrey.  



#7 frank5817

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Posted 11 August 2019 - 08:49 PM

Pete,

 

I have never tried to split that pair with a 90mm scope. You got a nice clean split with darkness between the pair after tweaking the scope. I'll need to give that a try on a good night.

 

Frank :)


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#8 cloudbuster

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Posted 12 August 2019 - 03:34 AM

Nice split of this famous double star. I like the way you show it in your sketch.

Regards, Martijn




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