Sunday, September 22, 2019

visited SEI 1371 (Halifax)

When I saw the BGO queue was empty I searched for an "old" double star in the WDS, the 18-24 listing. I found SEI 1371, aka SAO 70802, in Cygnus, a pair not updated from its single observation from 1895.

old double star SEI 1371 in luminance

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

WDS ID: 21015+3855
discoverer: SEI1371
observed: 1895
number of observations: 1
position angle: 147
separation: 11.2
magnitude 1: 9.6
magnitude 2: 11.6
class: A5
proper motion: +000-017
DM designation: +38 4316
precise coordinates: 210129.17+385455.4

Love that little faint line of 3 stars to the east...

The bad stacking makes it difficult to tell for certain but I do not see an obvious bright star at 11 arc-seconds to the south-east.

field of stars from SkyTools 3 Pro

Curiously, there's an obvious triad of stars to the south-west. The top star of this system does not show in SkyTools? Is that the missing star? That's far away...

There's also a star to the north. That's closer? Is that it?

Dove into Aladin. Nothing obvious.

Tycho 03168-1962 1 to the south has an obvious tight, faint companion to the west!

On another note, there's a gaggle of stars at the top-right, to the north-west. There is a pair noted in ST3 here with the primary as the east-most star. This is SEI 1365. Fascinating.


Imaged again on 7 Sep '20.

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