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Two challenge doubles in Sagitta

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#1 John Fitzgerald

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Posted 25 September 2019 - 10:33 PM

I observed these tonight and confirmed them without knowing the PA, and my estimated PA was very close.

 

STF 2482 m1=9.0 m2=10.2 Sep=1.8", PA 341 deg.  Used 173x and 243x on a 6" f/8 triplet.

 

STF 2488 m1=9.1 m2=10.0 Sep=1.8", PA 352 deg.   Used 243x.

 

STF 2482 was more difficult than 2488 in my estimation.


Edited by John Fitzgerald, 26 September 2019 - 08:47 AM.

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#2 flt158

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Posted 26 September 2019 - 08:42 AM

That is most extraordinary, John. 

 

2 doubles very near one another with almost identical magnitudes, separations, and PA's in Sagitta. 

 

Thank you for your report!

 

Clear skies from Aubrey. 



#3 John Fitzgerald

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Posted 26 September 2019 - 12:07 PM

I plan to revisit these two pairs when the seeing is better, and see if they are any easier to discern.


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#4 rugby

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Posted 26 September 2019 - 11:06 PM

My experience with these fine pairs is very similar to the post above. I used two scopes: a 120 mm ed refractor and a 10-inch f5.4 reflector. Normally, I find the pair in a 24 mm ES  68 degree eyepiece then confirm using a 6.8mm 82 degree.  With both pairs I suspected the companion with low power but it took a much higher magnification for a direct vision split. In the larger scope both pairs were easy targets. I am wondering if anyone took the time to see Struve 2484 while in the area?


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#5 John Fitzgerald

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Posted 27 September 2019 - 08:14 AM

Yes, I logged STF 2484 also. At magnitudes 7.9 and 9.5 and 2.1 sec sep, it was easily seen at 173x.
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