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Two challenging unequal STF doubles in Cor Bor

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#1 John Fitzgerald

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Posted 31 July 2019 - 01:16 PM

Last night I observed these two nice, somewhat challenging doubles with my 6" apo at 243x:

 

STF 2011 mags 7.9, 10.2 sep 2.7"

STF 2022 mags 6.5, 10  sep 2.2"


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#2 rugby

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Posted 31 July 2019 - 11:21 PM

John: Can you tell me what scope and eyepieces you are using for the pairs in Cor Bor. They will not be easy targets in my 120.



#3 John Fitzgerald

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Posted 01 August 2019 - 09:36 AM

ES 152 apo triplet f/8 F=1216mm. Pentax 5mm XW for 243x.

#4 rugby

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Posted 01 August 2019 - 11:49 PM

Struve 2022 in Cor Bor eluded both a 120 refractor and a 8 sct this evening . I used 260x with both scopes. My skies were good, collimation was reasonable but nothing seen.  In comparison Struve 2011 was mildly difficult  under the same conditions. The refractor gave the superior view. 2022 has a larger mag difference and I am viewing from a city so that might be the reason for my lack of success. 

North and in the same field of view as 2011 I found a wider and fainter pair. North and preceding was a very faint and tight duo part of a coarse triple that stood out with averted vision.



#5 John Fitzgerald

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Posted 02 August 2019 - 08:19 AM

Fron where I am viewing I can see the Milky Way in Cygnus. That might be the difference.

#6 rugby

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Posted 04 August 2019 - 10:06 AM

I had to try STF 2022 once again. This time I brought out the Nagler zoom, 3-6mmm , giving me a range from 150 to 300.

300x did the trick. I could see a tiny companion.

Bouyed by this success I moved on to STF 2084 (Zeta Herculis). Maybe it was the quality of the night because this time I saw two stars almost touching. The companion appeared greyish and slightly oval as if being drawn out along the direction of the first ring. I didnt expect how easy the split could be at 300x. My 8 sct view was a mess with poor collimation and no companion.




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