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A nice quadruple


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Recently I found out about a very nice 4 star system, known as STTA 176.

Find a pair of 6 mag stars 2 degrees south of Theta Serpentis (which is located in the northern part of Serpens Cauda). Half a degree to the southwest you will find a 7th mag star. This is STTA 176.

It consists of two 7.50 magnitude stars, A and B, separated by 94'' and two 11.00 magnitude stars (C and D), also separated by about 94''. The pairs are located 150'' from one another. I couldn't notice any color, though it is possible to see a bit of green.

There is a dim pair of 12th mag stars northwest of A/B and west of C/D. The separation is about 30'', so it's quite wide, but you may have a tough time seeing it in a small scope because of how dim it is. In a medium sized instrument though the pair makes a nice grouping with STTA 176.

This really is a nice star system! I really liked it's complexity and how easy it is to split if you have the needed dark skies. Check it out!

Coordinates

RA : 18 h  54 m     Dec : 1°  54 '

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A                          B                         C                     D                 Components                                                     Separation                    

-------------------------------------------------------------------------                                                                                                                                  

7.5                       7.5                      11.0                11.0             Magnitudes                                           A/B = 94''            A/C = 150''

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White/Green         White/Green       White              White          Colors                                                   C/D = 94''            B/D = 150''

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What scope were you using and what magnification, out of interest?

 I used my 10 inch Skywatcher dobsonian. I only put on my 48 magnification eyepiece - I usually try a few different ones so I can compare the views, but this time, for some reason, I forgot. My skies were dark enough for the components to be seen clearly (I would say limiting mag is 5)

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A fine sight last night. Caught at x50 in the 6" frac. Then a close up field at x150 to show the differing magnitudes and Pa's.

Similar to the lovely Σ2328 in Lyra at x50 showing two pairs at an angle .

Last night and up to 2.30 gave some of the darkest, clearest skies for months, hope you got out there !

Nick.

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I observed this earlier this week whilst enjoying the dark skies of Marnhull in Dorset.

It was a very pleasant view  :)

I was using my ST120 and using my baader zoom had a x25-x75 range so didn't push it.

Very good sketch :)

Cheers

Ian

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