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Splitting Delta Cygni with small scopes

double star observing observing report
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#26 Jon Isaacs

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Posted 25 September 2019 - 04:29 AM

A little story:

 

I like ST-80s, they're simple, inexpensive and versatile and I think they make good beginners scopes, they're about one half binocular and one half telescope.  They're not very good planetary-double star scopes but they're passable and show the moon reasonably well.  I buy them used and give them away.. 

 

The best one I've ever had is an older Celestron version that came on an EQ mount.  I've owned a couple of them but this one was different, it has a metal objective cell that threads to the tube and a metal dew shield.  I fitted it with a 2 inch focuser and my recollection is that I was able to split delta Cygni with it.  I had loaned it out about a year ago and I just received it back in the mail on Monday.  In light of this thread, I was eager to see if I could split delta Cygni... 

 

I probably spent about an hour swapping eyepieces, seeing if I could eek out the split. I went as high as 230 x and there were times when I thought I might be seeing something but I never made the split.  

 

Over to the double-double, I could split the one but not the other.  Frustrated, I went inside and got my WO 80mm F/7 FD and pointed it at delta Cygni.. No split.  No Cassini division.  This was very unusual, these are normally easy.  I went inside and got the 120mm F/7.5 ED, it normally provides clean, crisp views and has an easy time of delta Cygni.. No split, barely see the Cassini.  

 

Bad seeing.  Delta Cygni in the ST-80 will have to wait.  

 

Jon


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#27 db2005

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Posted 29 September 2019 - 07:55 AM

I took up the challenge of splitting Pi Aquila (1.4 arc seconds separation) with my 3" APO a few nights ago. As expected, no split, but I did see distinct elongation and a peanut-like shape with occasional hints of darkening between the two components. Magnification was around 190x.

 

These challenge-stars are so much fun!


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