Sunday, December 08, 2019

captured Struve 1664 (Halifax)

One more, before dawn!

Double star HD 109875, SAO 157411, Σ1664 in Virgo. On my "view again" list, had seen the C star.

double star Struve 1664 in luminance

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

C, no problem, even though dim. It's to the north-west of the primary. About 2x the AB split.

B is south-west, fairly bright, the closest.

D is west of C, south a touch, dimmer still. Less than the AB split.

E is east-south-east, brighter than B. About 4x the AB split.

Why is that other star not included? [ed: It is. According to the WDS, this is 12383-1131STF1664EF, first discovered in 1890. In fact, it is noted in SkyTools, in the Object Information box. It's just not labelled in the chart, some sort of catalogue error.]

First viewed from the backyard with an ETX 90 on 3 Jun '19.

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