posted Sep '21 doubles list

Prepared my double star "bulletin." It is a short list of suggested targets. I shared this on the RASC Toronto Centre forum. I post here for all.

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School's back in, sorta. Summer's over, sorta. One thing for sure: the Moon is back, big and bright. And that means you need to shift to planets, variables, and double stars.

Here's a short selection of doubles and multi-star systems from my life list, ones I find impressive and interesting.

star	also known as	alternate catalogue(s)
β Cap	ΣA52, Dabih, 9 Cap	SAO 163481, HIP 100345
ε Equ	Σ2737, 1 Equ	SAO 126428, HIP 103569
HD 177904 Aql	Σ2449	SAO 124265, HIP 93822
HD 203320	S 786 Cyg	SAO 33323, HIP 105298
V402 Lac	HJ 1735	SAO 51698, HIP 109354

Have a go. See if you can split them and detect colour. I hope you'll share your discoveries.

Blake Nancarrow

astronomy at computer-ease dot com

Notable double star designations:

Σ = F. Struve, STF

ΣA = Struve Appendix I, STFA, Σ1, ΣI

β = Burnham, BU

HJ = John Herschel