Thursday, July 22, 2021

posted Jul '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.


When the Moon phase is around full, you might think you can only clean dirty eyepieces. In fact, you can do lots of astronomy. Double stars, for example, punch through bright skies. Assuming you can find stars to star hop or align, you can have a ton of fun.

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

staralso known asalternate catalogue(s)
ζ CrB7 CrB, Σ1965SAO 64834, HIP 76669
PPM 20621BRD 3 in DracroTYC 04212-0419 1
100 HerΣ2280SAO 85753, HIP 88818
61 OphΣ2202SAO 122690, HIP 86831
β ScoGraffias, Acrab, H 3 7SAO 159682, HIP 78820

For PPM 20621 I couldn't find SAO or HIP catalogue references so use the J2000 RA/Dec coordinates 17°52.8 and +67°00.

Blake Nancarrow 
astronomy at computer-ease dot com

Notable double star designations:
Σ = F. Struve, STF

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