Thursday, September 28, 2017

aimed at Groombridge 34 (Halifax)

The Burke-Gaffney robotic observed imaged Groombridge 34 aka GX And for me. A multi-star system. From one of my "beautiful doubles" lists in SkyTools.

multi-star system Groombridge 34 in luminance

Luminance only, 60 seconds subexposures, 10 stacked shots. FITS Liberator, Paint.NET. North is up; east is left.

GRB 34 is a triple. The primary is magnitude 8.

The B star is to the north-east, somewhat close. In the SkyTools 3 Pro Object Information box, it says the second star is magnitude 10.6 and 34.7". In the chart, the star is rendered as very dim and shows as magnitude 18.7. Clearly that's incorrect. ST3P also says it is a binary system with a 2600 year period!

The C companion is to the west-south-west, well away. A bit dimmer at mag 11.5.

Why the bright star to the south is not consider part of this system is beyond me.

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Wikipedia link: Groombridge 34.

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