Friday, November 23, 2018

aimed at HD 20588 (Halifax)

Fantastic! I had selected this Camelopardalis target from Sissy Haas's book partly for the interesting colour descriptions... "Gloss white, peach white, bluish khaki." OK. She shows the labels OΣ 373 (for AB) and OΣΣ 33 (for AC). For fun I requested HD 20588 and BGO captured the data.

multi-star system STF 373 / STTA 33 in luminance

North is up; east is left. Luminance only, 1 second sub, a stack of a dozen shots. FITS Liberator, Paint.NET.

Now SkyTools 3 Professional refers to these stars as STF 373 and STTA 33. Who is right?

Clearly a quadruple system. Haas only notes 3 stars.

A is the brightest element in the centre of the image.

B is the tight companion to the east-south-east. The dimmest of all in the group.

C is the bright star further along, past B.

D is to the south of the partnership, less than A and C in luminance but brighter than B. ST3P shows this star is designated STU 1.

Looking forward to working this in colour...

There are other neat groupings of stars in the field.


Checked the Washington Double Star catalogue and found:
03221+6244STF 373AB
03221+6244STTA 33AC
03221+6244STU   1AD
So it's a little mistake in the book and ST3P is right.


Assembled in colour on 12 Dec '18.

HD 20588 in colour

RGB 3x12 each. FITS Liberator, Photoshop.

A is a soft pale orange. B is a touch darker orange. C and D are a dusty pale light blue.

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