Sunday, December 27, 2020

tried to find SEI 10 (Halifax)

It was a bright Moon but predicted to be clear in Halifax. So I loaded in a "neglected" double star target for analysis. SEI 10 or more formally WDS 00589+3230SEI 10. I chose the nearby star GSC 02281-0256 to centre the field of view. The BGO Robotic Telescope replied when it completed the observation.

region around dubious double star SEI 10

Red filter, 3 seconds subexposure, 12 stacked shots. FITS Liberator, GIMP. North is up; left is east. 

The 1x12 luminance image showed some strange artefacts...

SEI 10 has but one observation from 1894. It is listed with a PA of 100° and a separation of 12.4". The purported magnitudes are 9.5 and 10.0. The precise coordinates is 005853.67+323038.6. The comments field showed "NX." Oh oh. "Dubious double." Specifically it said "Neither component seen on POSS plate" and there "may be flaws on AC Potsdam plate."

The GSC target star in the centre is very faint at mag 14.3.

The brightest star in the field, at the 8 o'clock position, a bit south and east of centre is HD 5704. It shines at magnitude 7.4.

Stars in the mag 10 range are to the north-east, widely separated, and to the south-east, vertically oriented. The wide pair at the bottom-left are 61 seconds-of-arc apart with a position angle of 185.

Intriguingly, there is a faint double below centre in the Burke-Gaffney Observatory image, not shown in SkyTools 3 Professional. The software chart only shows a single point at this location, for J005855.0+322642, a mag 14.1 ember. Even so, the vertical orientation suggests a PA around 180. I estimate the sep at 20".

So, at this stage, this is inconclusive. There are no obvious tight mag 9 or 10 stars in a left-to-right orientation...

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