Double Star Session3

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Double Star Session3

Postby Aratus » Wed Sep 07, 2016 5:44 pm

I was able to photograph some fairly close double stars recently. Almach (gamma) in Andromeda is just about visible as 2 stars in a very small telescope. In something larger it shows a 2nd magnitude orange primary star with a blue 5th magnitude companion 10" away.

By contrast 'Eta' in nearby Cassiopia has the opposite arrangement, a blue 3rd magnitude primary with a pink looking 7th magnitude companion.

Another double of personal interest to me is known as 'phi' in Cassiopia. It is very faint 5th magnitude star which I noted back in 1972 in my 40mm telescope as a 'double star'. When I got a larger telescope I realised this 'double star' was actually the 'eyes' of a feature known as the 'Owl Cluster' or NGC 457. On this occasion I took a photo showing the entire cluster. Can you see an owl flying with wings outstretched with 2 glowing eyes? !
I use an 11" reflector (Celestron CPC 1100) and a 3" refractor, (Sky-Watcher ST80) mounted on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI 120MM, ZWO ASI1600MC and Canon 1300D for imaging.
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