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Old 27-01-2018, 09:37 AM
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The Mekon (John Briggs)
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Join Date: Jul 2007
Location: Bowral NSW
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The finest triple double in the sky?

For discerning observers only!

I mentioned this group when discussing the main star in NGC 6193 in the observation report section. It is quite close to NGC 6193 in Ara.

Just north of the 6193 complex, is a small triangle of stars spanning around 0.4 degrees of sky. This group consists of the following double stars

HD 150040 mag 8.5/9.5 @ 2.6"
HD 150083 mag 7.4/9.4 @ 1.7"
HD 149901 mag 8.0/8.1 @ 1.4"

You will need a magnification of around 200x to resolve this group combined with a field of at least 0.4 degree, so a Nagler or Ethos type eyepiece is essential. I have found the best views were through my 132mm CFF at 184x in a 5mm Nagler yielding a .44 degree field. All the stars were distinctly split.

I first noted this group with my AP 130EDT using a 4.8 Nagler (212x). It was a real jiggle to get the three double stars in the field, a little less magnification is to be preferred along with good seeing and excellent optics.

If there is a better triple double, I would really like to know about it.
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