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I've never studied double stars before so I wasn't sure of this one, but I'm getting more convinced it is the mate of Sirius.
Look at this second image and you will see more stars.
The one at 5 o'clock to Sirius is GSC 5949:2774 and is 5'27" away.
The image scale is 3.29 arc secs per pixel, a cropped image taken with a
QHY8 using a ZS 80 II ED 'scope.
I hope this will help confirming.
Vince G
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