Friday, June 01, 2018

imaged HD 177783 only (Halifax)

I had hoped to image the multi-star system HD 177648, one of the attractive suggestions from Coldfield list. I programmed the BGO robot with the target which it accepted.

But then I noticed there was another system nearby. For the second time, I tried employing the OFFSET option with the imaging request.

I shifted too far! It pushed my main target out of the view. Oops. You can just barely see it the bright wide AB pair at the bottom-right corner of the photograph!

I was only left with HD 177783 in the field. This is a triple in Vulpecula. Below and right of centre.

multi-star system HD 177783 in luminance

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

The B star, somewhat dimmer, is almost due east of the primary. A titch to the north. Very close. Almost touching. The C element is further along, about 7 or 8 times the distance, canted a bit to the south.

This system is also known as BU 359.

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