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  #1  
Old 20-09-2017, 04:03 PM
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The Mekon (John B)
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NGC 6193 double star obs

Last night I turned my new CFF 132mm to NGC 6193 in Ara.

The brightest star in this cluster/nebulosity is H 4876 and 21 years ago I noted this a close double with a 9th mag companion. I was using my Astro-Physics F8 130EDT at the time and the conditions must have been pretty good for me to observe this companion as the separation is around 1.5" and there is a 3 mag difference between primary and secondary. Despite a number of attempts to split this system again, I had failed to do so and was wondering if I had fudged the observation 21 years ago.
Last night I set the CFF to NGC 6193 and with a magnification of 183x clearly split the major star in this group, doubling up with a barlow to check and it was even better! This star has two other companions one about 10" west and another 13" SE. The hard part is observing the close companion to the North.

Would appreciate any other reports

John
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  #2  
Old 21-09-2017, 01:23 PM
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Tinderboxsky (Steve)
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Interesting tale with a satisfying outcome.
I do not have a record for this in my log, so Iíll add it to my target list. I will have to be patient waiting for the right night!
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  #3  
Old 21-09-2017, 06:15 PM
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The Mekon (John B)
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Thanks Steve, I am disappointed there is not more action in the observing section of IIS. Too many equipment junkies!

On a following note, nearby to NGC 6193 is what I consider perhaps the best triple double in the sky - it is not easy to view, but not hard to find. This is a topic for another thread though.
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  #4  
Old 22-09-2017, 10:48 AM
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Tinderboxsky (Steve)
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Yes, it is disappointing there is not more observing activity posted. I guess I am guilty of this too as I only post a very small fraction of my observations. I am a keen and active visual observer interested in a broad cross section of targets and observable events. I have a particular interest in observable transient events but only manage to see just under 50% of the events I am interested in - the events are time specific and the clouds are blissfully unaware of my needs. then, time gets away from me and I wonder who would be interested any way. Interest in the night sky these days is dominated by astro imaging and as you say there are alway plenty of equipment junkies in the back ground.

By the way, your reference to H 4876 has me slightly confused. I browsed Sky Safari last night to find the double star and itís position within NGC 6193 to give me a feel for the target and the surrounding star field. Sky Safari lists the brightest star in NGC 6193 as HR6187 and does not give H 4876 as an alternative catalogue number. Visual magnitudes are listed at 5.57 and 8.39 with a separation of 1.7Ē at 9.0 degree. So It would have to be the same double star. I have not had a chance to reference other charts.

Do post about your nearby favourite triple when you have a free moment!
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  #5  
Old 24-09-2017, 04:36 PM
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The Mekon (John B)
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Thanks for checking on this Steve.

You are correct in that the star in NGC 6193 is also listed as HR 6187. Not sure but this may be one designation for the whole system.
My reference to H 4876 comes originally from Burnhams which I used on the original observation 21 years ago. In fact I now use
http://stelledoppie.goaction.it/index2.php?section=1 to check out doubles and looked it up under this number (4876) and it came up with the 6193 system, particularly labelling AD and AE components under this designation. I did not see the D component with the 132mm, but can see it easily with the 18", but then again this scope does not show the close B component!

All up this is a delightful system to study, with three stars around 10" or less separation from the primary, + the close component at 1.7"

John
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