Tuesday, October 03, 2017

revisited 32 Cyg (Halifax)

I programmed the BGO robot to image 32 Cygni (and friends) centring on TYC 3563 02372 1. Bright 32 Cyg aka S 743 is a double-star.

It was recorded in my SkyTools 3 Pro "multiples" life list but not officially logged. Neither was it noted on my online life list. It was marked in ST3P to view again. When I reviewed all the observing sessions it was included in, I did not find any specific observing status flags. I was not sure how it got on the SkyTools list. It suggested I had viewed it before. This could be the first.

double-star 32 Cygni in luminance

Luminance only, 3 seconds subexposures, 20 stacked shots. FITS Liberator, Paint.NET. North is up; east is left.

32 Cyg A is the very bright star on the east (left) side of the image. Nearly due south is a medium bright star. This is 32 Cyg B. Widely separated.

Lodriguss includes this object in his naked eye double star list.

Due west of 32 is what appears to be a dim pair, canted south-west through north-east. This is ES 799. It is actually a quadruple system! The upper left element is actually A and B merged separated by 2.3 seconds of arc. The bottom right star is C. While ST3P refers to D, it does not show it on the chart. The software says it is 3.7" away from C at position angle 74.


I think part of the confusion may be that 32 Cyg is also known as ο (omicron) 2 and it is near 31 and 30. The ο designation has been used over the years for two or three of these stars creating some ambiguity. The Flamsteed designation is more clear than the Bayer.

30 and 31 are not shown in the photograph.

30, 31, and 32, in the Swan's right wing, together make an interesting naked eye and binocular target.


Produced colour image on 15 May '18.


Wikipedia link: 32 Cygni.

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