Monday, February 05, 2018

imaged 16 Aur and HD 34413 (Halifax)

The BGO robot moved to an interesting target for me, aiming at SAO 57856, in Auriga. A double of doubles. Multi-star system HD 34413 (aka ES 59) is to the north-east while bright double 16 Aurigae (aka STT 103) is south-west. Poor image quality sadly is turning most of the stars big ovals.

16 Aur and HD 34413 in luminance

Luminance only, 4 seconds subexposures, 10 stacked shots. FITS Liberator, Paint.NET. North is up; east is left.

Remarkably, despite the poor data, the HD 34413 A, B, C, and E stars are resolved. The primary is slightly brighter than B. B is almost due north. C is very faint and to the north-west of B, slight less than the AB separation. E is visible to the south-south-east of A. It almost looks like a double! Hmm.

I cannot split 16 Aur... The significant Δm, the tight sep., and the bad seeing are conspiring. This pair is noted in the RASC Observer's Handbook.


Where's HD 34413 D? SkyTools does not show it. The WDS reports the following: ES 2611 DE, as of 2001, is at PA 358 and sep. 4.1. Well that puts is very near to E, to the north! Ah ha! That's the mystery double!

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