Sunday, January 14, 2018

sorted ARA 753

Reviewed double star ARA 753 imaged in August 2017. Tried to sort this 10 Dec '17. I compared data from SkyTools 3 Professional and the Washington Double Star database.

PA sep year A B RA dec notes
ST3 173 5.5 1919 10.94 13.1 18 31 29.3 -19 05 12 does not
match photo
WDS 176 5.8 2010 10.62 11.1 18 31 30.97 -19 03 43.3 does not
match photo

The bright pair to the north-west of the S star of U Sgr which ST3P refers to as GSC 06274-1098.

PA sep year A B RA dec notes
ST3 178 6 - 10.1 10.1 18 31 31.0 -19 03 43 north
star
ST3 - - - 10.1 10.1 18 31 31.0 -19 03 49 south
star
WDS 176 5.8 2010 10.62 11.1 18 31 30.97 -19 03 43.3 matches
photo

So, I think I have figured this out. It looks like ARA 753 is the bright double north-west of S and it looks like ST3P is wrong. And therefore I think I have in fact split this particular double.

SkyTools calls ARA 753 the pair to the west of S. But the position angle and magnitudes don't match.

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