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Double-Doubles off the Beaten Path

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#1 Cotts

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Posted 07 December 2019 - 08:06 PM

I have reached a bit of a milestone in my "Struving" project.  I have now hit the 1000 object mark....  I haven't split all of them, some were too close, some had a really faint component.  

 

I decided to go over my observing notes for this project (June 2005 until August 2019....) and pick out some notable things.

 

In this post I list a few "Double-Doubles" that I came across.  The copy-paste thing from my spreadsheet doesn't work so well here so I will explain the layout.  (Subsequent posts will be on Colored Pairs and "Other Oddities" over the next couple of weeks).

 

STF# , MagA, MagB, Sep." PA, Pair Sep.  (The last number is the approximate separation between the two pairs in arc minutes)

 

None of these pairs will rival the original Double-Double, Epsilon Lyrae, but they are worth a look.

 

The RA and DEC of these are left as an exercise for the reader..... 

 

I'll attach the Spreadsheet as an Excel file as well... 

 

 

STF  mags Sep. P.A. Pair Sep
54 9.8, 11.0 18.3” 189 5’
55 8.3, 8.9 2.3” 331 5’
   
735 8.9, 9.5 35.7” 350 11’
ENG 21 8.2, 9.3 44.8” 252 11’
   
1764 6.8, 8.6 15.9” 32 3’
1765 10.5, 10.7 37.9 161 3’
   
2057 10.5, 10.6 4.9” 268 3’
2058 10.4, 10.6 2.1” 352 3’
   
2435 10.6, 12.9 10.9” 19 3’
2436 8.6, 9.3 30.1” 315 3’
   
2455 7.4, 9.4 9.6” 28 25’
2457 7.5, 9.5 10.2” 201 25’
   
3057 6.7, 9.3 3.9 298 13’
3062 6.4, 7.3 1.6 3 13’

 

Attached File  Double:Double.xlsx   481.21KB   20 downloads

 

Have fun!

 

Dave


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#2 R Botero

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Posted 08 December 2019 - 03:18 AM

Thank you for sharing this Dave waytogo.gif I’m up in the 900s in my Struve “watch” but have not been as organised as you have bow.gif

Roberto


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#3 c2m2t

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Posted 03 February 2020 - 08:21 PM

Hi Dave!

Your list made me curious as to how many of these that have I imaged. A quick check of my image archive uncovers 5 of 7 pairs and for good measure I have added 3 more. I have yet to capture STF's 54 + 55 and STF's 3057 + 3062. I will add them here in 4 batches...I think that will work...if not I will add more more entries.

 

As per your list, here are STF 735 + ENG 21 and STF's 1764 + 1765. Check Stelle Doppie for some interesting notes about STF's 1764 + 1765.

 

Cheers, Chris.

Attached Thumbnails

  • STF 735+ENG 21-4949-ns-ID.jpg
  • STF 1764-1765-3444-ns-ID.jpg

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#4 c2m2t

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Posted 03 February 2020 - 08:30 PM

Installment 2

 

STF 2455 + STF 2457.

 

I am posting this one separately because of the nature of the beast. Dave...you must have been viewing this pair with a long focal eyepiece. I had to construct this image using two, full frame images...same as the other images I have added. Some how I manage to miss the yellowish star, SAO 86822, found about half way between the two doubles. The compound image supports your observation that at relatively low magnifications, this pair should resolve.

 

 

Attached Thumbnails

  • STF 2455+2457-ns-ID.jpg

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#5 c2m2t

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Posted 03 February 2020 - 08:36 PM

Installment 3

 

Systems STF's 2057 + 2058  and  STF's 2435 + 2436

 

The STF 2435AC pair is a bit of a surprise...not something that we come across too often for Struve systems.

In this case the "C" companion is mere ember at magnitude 12.90

Attached Thumbnails

  • STF 2058-2057-0756-ns-ID.jpg
  • Struve 2436 + STF 2435-ns-ID.jpg

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#6 c2m2t

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Posted 03 February 2020 - 08:45 PM

And last but not least...

 

Installment 4

 

Systems include:

 

1)  STF 2470 + STF 2474....Lyra's lesser known Double Double

 

2)  STF 761  +  STF 762....the prettiest "Arrowhead" in the night sky

 

3)  STF 745 + STF 747 + STF 752...a splashy triple triple !!!!

 

Enjoy !

 

Cheers, Chris.

Attached Thumbnails

  • STF 2470+2474-7506-ns-ID.jpg
  • Struve's 761+762-5031-ns-ID.jpg
  • STF's 745,747,752-4977-ns-ID.jpg

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