Monday, July 05, 2021

tried xi Boo again (Halifax)

Imaged ξ (xi) Boötis or Σ1888 again, for the 3rd season. Tried a week or so ago but something broke. Tonight's result is fair.

This is a fast-mover, a binary with a period of 151 years.

binary xi Boo in luminance

Luminance only, 0.5 seconds subexposures, 12 stacked shots. FITS Liberator, GIMP. North is up; east is left. Centred on SAO 101256.

There appears to be a bad stack artefact (mmm, good idea for a bad name) but it'll do. Zoomed out, that's all you see; but if you embiggen the image, you'll see the true companion star to the north-west, around the 2 o'clock position.

Last imaged on 11 May 2020.

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