Wednesday, June 20, 2018

photographed SAO 186216 (Halifax)

The Burke-Gaffney Observatory imaged HD 164863 aka SAO 186216. This is a multi-star system in the constellation Sgr. In the middle of open cluster Messier 21 (M21). Viewed the star system in July 2015. I had not split the G, E, and the C stars.

multi-star system HD 164863 in luminance

Luminance only, 1 second subexposures, 20 stacked shots. FITS Liberator, GIMP. North is up; east is left.

A is the brightest star, of course.

B and C, merged, are to the north-west. They are too close together for BGO to resolve.

D is the somewhat bright star north of A.

E is an extraordinarily dim star north-east of A, inline with a number of bright stars aligned to the east-north-east. Barely visible in the photo! That seems very strange.

F is east-south-east of A, opposite BC, twice the distance.

G is the dim just close to F, just north. Actually, north-north-west. Never spotted before.

H and I are the equal stars, dim, to the west of BC.

Good to get a couple more...

Double star V4202 is visible to the south-west, far away, near the edge of the image. A bright primary and dim secondary to the north-east. A non-related star to the east makes for an attractive little triangle.

The wide pair LYS 32 is due south, also near the edge. Nearly equal stars, oriented south to north.

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