Thursday, January 17, 2019

imaged neglected ES 619 (Halifax)

I asked BGO (with the Windows app) to image neglected double star ES 619 in the Andromeda constellation. It didn't like the HD 14471 reference so I aimed to GSC 03294 01815. Given the empty queue, it captured the target within minutes. ES 619 is the brightest object, just right of centre.

neglected double-star ES 619 in luminance

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

The Washington Double Star database notes the following:

02215+4625ES  619      1894 1970    3 240 246   5.1   5.9  7.9  10.6  K5        -028+009          +45  600   D  022129.8 +462455.

So no observations since 1970. Position angle then was 246 degrees with a separation of 5.9 arc-seconds. The primary magnitude is listed at 7.9 while the secondary is 10.6.

Stella Doppie lists observations in 2008, 2014, and 2015. The latest suggests the PA is 245° and SEP is 5.7".

Mine is not a great image. There are problems in the stack. Probably the sky conditions were a factor. I'm inclined to redo it but in the meantime a deep dive does show a dim companion to the west.

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