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Nu and Xi Scorpii and 68 Her.

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#1 John Fitzgerald

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Posted 09 July 2020 - 06:49 PM

I looked at both these showpieces in Scorpius last evening with my 6 inch f/8 triplet.  Used the new 6mm Delos for 203x.   Both the close pairs showed as thin waisted peanut shapes due to seeing.

 

Nu Sco m 4.35, 5.31, sep 1.3" at PA 2. Second pair m 6.6, 7.23 , sep 2.4" at PA 56. The pairs are about 41" apart at PA 337.

 

Xi Sco .m 4.87, 5.16, sep 1.1" at PA 10.  Third star, m 7.3, sep 7.5" at PA 43 as measured from the A component.

 

Also:

68 Her, aka STT 328. m 4.8, 10.3, sep 4.5" at PA 59.  Before looking up the PA, I estimated 60 deg.  This double was somewhat difficult.  203x


Edited by John Fitzgerald, 09 July 2020 - 09:16 PM.

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#2 chrysalis

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Posted 09 July 2020 - 07:37 PM

Xi Sco is one of my favorites, a pretty "double double". 

 

Xi Scorpii DSC02989.JPG


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#3 chrysalis

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Posted 10 July 2020 - 02:55 AM

I think that's a picture of Nu Sco?

No, that's Xi Sco.



#4 John Fitzgerald

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Posted 10 July 2020 - 08:12 AM

Ok, so it's a quad also. WDS catalog only shows three stars.  I see two pairs in your picture of Xi Sco.

Sorry for my questioning. 


Edited by John Fitzgerald, 10 July 2020 - 08:19 AM.

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#5 chrysalis

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Posted 10 July 2020 - 10:10 AM

Ok, so it's a quad also. WDS catalog only shows three stars.  I see two pairs in your picture of Xi Sco.

Sorry for my questioning. 

No worries :) !!



#6 gfeulner

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Posted 10 July 2020 - 11:43 AM

Xi Sco is one of my favorites, a pretty "double double". 

 

attachicon.gifXi Scorpii DSC02989.JPG

Not to start a debate but I think John is right. You can clearly see 4 stars in the photo. It sure looks like Nu Sco. Xi is a triple. My scope shows the same image.

 Gerry



#7 John Fitzgerald

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Posted 10 July 2020 - 12:36 PM

Not to start a debate but I think John is right. You can clearly see 4 stars in the photo. It sure looks like Nu Sco. Xi is a triple. My scope shows the same image.

 Gerry

No, I was wrong.  It's Xi.  The scale on that photo is such that the more distant pair, STF 1999, shows in the photo.  The brighter pair shows only A and C in the photo.  The magnification factor of the photo is too low to show the close A-B pair.



#8 gfeulner

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Posted 10 July 2020 - 12:51 PM

Okay, now I understand.

Gerry



#9 mauigazer

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Posted 12 July 2020 - 03:46 PM

Here's a sketch I made of these two systems back in 2017 after reading John Nanson's segment in his blog Star Splitters here. I'm linking it to my Photo Gallery of sketches that has a full report.

S. McG.

 

 

STF 1998, Grafias, and STF 1999 in Scorpius

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#10 John Fitzgerald

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Posted 13 July 2020 - 10:34 AM

I revisited Nu and Xi Sco last night.  STF 1999 is a pair with a wider third star near Xi.   Together  with Xi, there are six stars showing in my 6mm Delos eyepiece at 203x.




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