Some nice summer doubles from July 6, 2021 log

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John Fitzgerald United States of America
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Some nice summer doubles from July 6, 2021 log

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Post by John Fitzgerald »


While at my dark site observing mostly faint things with my 12" f/5 Dob at 175x, I came across three interesting unequal doubles last night, July 6, 2021.


5 Serpentis. I happened to notice this while finding the globular cluster M5, which appears close by in the sky. Magnitudes 5.1, 10.1, sep 11.1" at PA 36 deg. This is a physical double about 83 light years distant, with a projected separation of about 282 AU.

Beta Scorpii AC m 2.6, 4.5, sep 13.4" at PA 20 degrees. This is a pretty double, although purely optical, per the WDS catalog.

Delta Herculis, m 3.1, 8.3, sep 13.7" at PA 293. The primary lies about 75 light years away. After closing for many years since discovery, this double is now separating, and is not believed to be physical.

I frequently happen upon double stars by chance, while sweeping, or star hopping for faint objects. I like to identify them and log them, if particularly interesting.
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Unitron48 United States of America
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Re: Some nice summer doubles from July 6, 2021 log

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Post by Unitron48 »


Nice catches, John. Lots of beautiful doubles out there!!

Dave
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Re: Some nice summer doubles from July 6, 2021 log

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Post by kt4hx »


Well done John. I have seen 5 Serpentis many times, but always as secondary to M5. They make a nice "double" for the naked eye to discern in darker skies.
Alan

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Re: Some nice summer doubles from July 6, 2021 log

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Post by John Baars »


Three nice doubles. Thanks for your great report!
I frequently happen upon double stars by chance, while sweeping, or star hopping for faint objects. I like to identify them and log them, if particularly interesting.
I come across them too sometimes but most of the time but I am too eager to hop further. Nice you have got the patience to identify them. Keep up the good works!
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
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Re: Some nice summer doubles from July 6, 2021 log

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Post by mikemarotta »


John Fitzgerald wrote: Wed Jul 07, 2021 6:10 pm ... I frequently happen upon double stars by chance, while sweeping, or star hopping for faint objects. I like to identify them and log them, if particularly interesting.
Yes, it is interesting how they stand out. I was amazed when I stumbled on my own first (eta Pisc) while lining up Mars in Pisces last December.
01 Dec eta pisc (jump).jpeg
Like you, I stopped to note in my log and then went back later.
01 Dec eta pisc.jpeg
I went back the next night for a better observation.
eta pisc 02 Dec 2020.jpeg
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Michael E. Marotta
Astro-Tech 115 mm APO Refractor Explore Scientific 102 mm f/6.47 Refractor Explore Scientific 102 mm f/9.8 Refractor Bresser 8-inch Newtonian Reflector Plössls from 40 to 6 mm Nagler Series-1 7mm. nonMeade 14 mm. Mounts: Celestron AVX, Explore Twilight I Alt-Az, Explore EXOS German Equatorial
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