Friday, July 20, 2018

your monthly double stars

Issued my double star "bulletin" for July. It is a short list of suggested double and multi-star targets. I shared this on the RASC Toronto Centre forums. And I post here for all.


Happy Moon Landing Day. Speaking of our nearest celestial neighbour… even though Luna is getting brighter and brighter in the evening, you can still do astronomy. Double stars punch through moon-lit skies!

After delivering my double stars presentation in February, I thought a periodic post with fun multi-star systems would be interesting. Here’s a short selection of doubles from my life list, ones I find very impressive. Good for July. I did not include terribly tight targets.

staralso known asalternate catalogue 
HR 6043 in CrBSTT 305HIP 79350
T DraES 20HIP 87820
γ (gamma) DraEtamin, Eltanin, or Burnham 633SAO 30653
α (alpha) HerRasalgethi or STF 2140HIP 84345
HD 159481 in OphΣ (Struve) 2185SAO 122529

I encourage you to add these to your observing list. Doubles are easy, challenging, interesting, colourful, dynamic–always fun!

Let me know how you did! Happy to take questions.

Blake Nancarrow
astronomy at computer-ease dot com

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