Saturday, December 07, 2019

curious about STF 681 (Halifax)

Ordered BGO to capture Σ681. Also known as HD 34533, SAO 40251, and HIP 24951, this Auriga double star is noted in Sissy Haas's book with interesting colours: banana yellow and ocean blue! OK, I gotta see this.

double-star STF 681 in luminance

Luminance only, 1 second subexposures, 12 stacked shots. FITS Liberator, Paint.NET. North is up; east is left.

I look forward to processing in colour.



STF 681 in colour

Photoshop CS2.

Well, yes, yellow and blue. Banana yellow? Dunno about that... Ocean blue? Um, yeah, it'd be great if you could resubmit that colour report. And don't forget the new cover sheet.


There is a point of light above or north of the main star. It's visible in the black and white but I didn't think much about it. It's there in the colour, somehow more obvious. In the colour image, it's a dim red star! Hmmm. Checked the WDS.

STF 681AB    1831 2017   42 181 183  23.4  23.3  6.61  9.21
FYM 198AC    1999 2015    4 346 346  16.5  16.6  4.6   9.5

Oh ho. There's a star to the north, at 346 degrees. Discovered in 1999.

Curiously, it says magnitude 9.5. I'd argue that.

Anyhoo, I tagged the C companion.

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