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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12091
Loc: Cumberland, R I , USA42N71.4W
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This is another excellent challenge double. Many should be able to see the 9.6 arcsec uneven pair (Y Del = 4.5-5.5/9.6") with a 15x, but not every night. And also with this one, good focus is critical. I've occasionally seen what looked like a split with 15x70s. 16x makes it just a bit easier. At 20x you should be able to see it all the time. But there is a bonus.
Just southwest of Y Del, the nose of the Dolphin, is another fainter and much closer pair. Struve 2725 is 7.6-8.4/5.8". It is best seen with 25x or more. It's a challenge for 25x.
IIRC, the orientation of these two pairs is similar to the Double-double.
Anyone with a BT, even low powers from 25-30x show this pair nicely separated along with the brighter and more conspicuous Y Del.
My observation
Gamma (12) Delphinus and Struve 2725
Gamma Del, at 4.5-5.5/9.6” the point star of Delphinus, is a double I look at almost every time I’m out. It is an easy double for a 20x80, but will be difficult for a 15x70. Gamma has been cleanly split with a 16x70 Fujinon. I had hoped to see it elongated with the 10x60 but it did not show itself. In the 20x80 it was clearly separated. A little below y Del is a much tighter double, Stf2725, at 7.6-8.4/5.8”, a challenge even for a 25x binocular. I noticed it elongated in a 20x80. It's beautifully split in the BT100 using 20mm TVplossls at 31x.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
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GlennLeDrew
sage
Reged: 06/18/08
Posts: 283
Loc: Ottawa, Ontario, Canada
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I've easily split gamma Del in my 26X100s, but never thought to even try Struve 2725. It sounds like a nice pair of doubles. I'll definitely give it a go!
Speaking of "double doubles", I'm pretty sure you must have enjoyed xi Sco at some time. It's one of my all-time favorites for large binos.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Mediocre minds discuss people. Good minds discuss events. Great minds discuss ideas.
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rookie
super member
Reged: 01/14/06
Posts: 166
Loc: St Petersburg, FL
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Thanks for the new targets. I'll check them both out, just need clearer skies and a day off from work so I can be up late enough to see Delphinus.
I've looked at Xi Sco before because it was a recommended double star target in Sky & Tel in the past but I'd forgotten about it this year. 
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Shirley
Celestron CPC 800XLT
Garrett 0ptical BT80~45degree
Celestron Ultima 9x63 & Regal LX 10x42
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ronharper
scholastic sledgehammer
Reged: 02/14/06
Posts: 872
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I dark-lined Gamma Del last summer a few times with my 16x70, but never saw the two neat dots I'd like. Stopped down to 40-50mm, it is too easy, it's cheating.
I'll try again later this summer, as soon as the western mountain smoke/cloud/rain season passes.
Glenn thanks for the reminder on Xi Sco. I don't even know if I've looked at it or not. I I'll have to head for a Greek alphabet reference to relate this to the appropriate squiggle.
Ron
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rookie
super member
Reged: 01/14/06
Posts: 166
Loc: St Petersburg, FL
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This is a nice
Greek alphabet
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Shirley
Celestron CPC 800XLT
Garrett 0ptical BT80~45degree
Celestron Ultima 9x63 & Regal LX 10x42
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ronharper
scholastic sledgehammer
Reged: 02/14/06
Posts: 872
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Thanks, Shirley. The double squiggle with the extra wiggle, I hate that one. So, Xi is star in Scorpius right up-tail from the snake eyes. I don't think I have ever seen this one. It's a complex multiple star, but there's an equal 12" pair in there that a 16x ought to split. Can't wait to try it with bino and scope.
Ron
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