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Stt 371 Triple star in Lyra

7 months 18 hours ago #107253 by flt158
Stt 371 Triple star in Lyra was created by flt158
Hello, double star afficionados.
I assembled my William Optics 158 mm apochromatic refractor on Wednesday night 21st August 2018.
Lyra was near the zenith. It is extraordinary that this small constellation has so many doubles, triples and multiples stars existing within its boundaries.
So I set out to find more new ones. (Guide 9.1 DVD was used).
Using www.stelledoppie.it I came across a new triple called Stt 371 near the southern end of Lyra.
Components A and C have magnitudes of 7.0 and 9.8. Their separation is 47.4". The PA is 271 degrees.
Only 40X is required to see both stars.
I did have doubts in splitting A and B, but I gave it a go anyway.
The night was very humid; but the wind had died down considerably by 10 pm.
In went my Meade 6.7 mm eyepiece which gives 167X. I saw there was something happening.
My next eyepiece is a splendid Nagler 5 mm. That's 225X and I could see 2 stars hugging one another.
So next came my William Optics 4 mm which gives 280X and immediately there was black space in between A and B.
My wife joined me, and as they say: "she saw and believed"
Stt 371 is the tightest double star I have ever split.
The separation is 0.9 arc seconds. The magnitudes are 7 and 7.6. the PA is 159 degrees.
Of course it is helpful that the 2 stars only have 0.6 magnitude difference.
Please come back to me with your comments; and please do inform the rest of us if you have observed it at any time in the past.
Thank you very much.

Clear skies to all from Aubrey.
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7 months 4 hours ago #107254 by Fermidox
Replied by Fermidox on topic Stt 371 Triple star in Lyra
Congrats Aubrey. I think the closest double star in the Otto Struve catalogue might be STT 21, otherwise known as HIP 4911 on the Andromeda/Cassiopeia border. Separation is given as 0.2 arcseconds, so you'll need quite an eyepiece/clear sky combo for that one!
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7 months 2 hours ago - 6 months 3 weeks ago #107255 by flt158
Replied by flt158 on topic Stt 371 Triple star in Lyra
Thank you, Fermi.
I reckon I will leave HIP 4911 and STT 21 for the 16" Dobsonians! :laugh:
In the meantime I will work on the slightly easier tight doubles.
But then again, I am just checking it on www.stelledoppie.it and I see its separation is 1.16".
So maybe it is not too bad at all.
The magnitude difference is quite a bit challenging.
A is 6.8, B is 8.1.

Thank you for your kind congratulations.

Aubrey.
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6 months 3 weeks ago #107256 by Fermidox
Replied by Fermidox on topic Stt 371 Triple star in Lyra
I was looking at an older reference for that separation Aubrey, so it may well have widened in the meantime. Anything around the 1 arcsecond mark is still quite challenging in our normal conditions I would say.

Finbarr.
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