Friday, August 11, 2017

started with 57 Aql (Halifax)

I wasn't expecting anything this evening; whereas, the last night I was. The Burke-Gaffney Observatory began a long campaign for me. I had many double star targets in the queue.

BGO first imaged 57 Aquilae (centred on GSC 05725-1337). Also known as Struve 2594, this popular and colourful double-star is in the Sky & Telescope magazine summer list and the RASC Observer's Handbook.

double-star 57 Aql in luminance

Luminance only, 2 seconds subexposures, 20 stacked shots. FITS Liberator, Paint.NET. North is up; east is left.

I wanted to look again to check the colours. My log notes (from 30 Aug '07) show, "The brighter one is a pale lilac; the fainter star is pale yellow." The RASC list says yellow and green. Huh. Will need to do colour processing to complete my study...

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