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HR 7140 / STT 525


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23:17 est u.s.a.  Using AR6 I caught a little speck of light sitting at the 4 o'clock position.  On this star that would be the B component . Seeing was Pickering 7 , transparency was a 7 . Not many nights like this fellas in western Pennsylvania . This was a very challenging double so I viewed it for an hour to make sure I was not seeing things. Who's up for it?

  AB: 5.99+9.28 mag, STT 525, ADS 11834, B=HIP 92833
PA 128° Sep 1.80" (2003) :grin:

     mike h

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How would we find this sort of thing if manually hopping with a dob/frac on an alt az mount? I cannot find this in the Cambridge DS book although I did find the STT catalogue on wiki. I suppose I could always look on Stellarium but I prefer a book in hand at the scope.

Cheers

Shane

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How would we find this sort of thing if manually hopping with a dob/frac on an alt az mount? I cannot find this in the Cambridge DS book although I did find the STT catalogue on wiki. I suppose I could always look on Stellarium but I prefer a book in hand at the scope.

Cheers

Shane

I think it is in Cambridge as Sh 282/Sigma 525, which is easy to find visually as it forms an equilateral triangle with Gamma and beta Lyrae.

From the data, it looks as though 200 - 250mm clear aperture will be needed to see the companion, if the equation is right, but I was going to have a go anyway with my blue filter.

Chris

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Give it a go Chris I swear I caught it come in and out a few times. Just a tiny tiny dot.  Maybe I was seeing things!!!!

                                                                                         mike h

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How would we find this sort of thing if manually hopping with a dob/frac on an alt az mount? I cannot find this in the Cambridge DS book although I did find the STT catalogue on wiki. I suppose I could always look on Stellarium but I prefer a book in hand at the scope.

Cheers

Shane

Shane, The first thing you will see is the A/C double. The C component sits just north . I used the C component as 12 o'clock . 

Component C of pair AC; primary star is HR 7140

 Sep 45.00" (2003) : obvious split currently

mike h

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Give it a go Chris I swear I caught it come in and out a few times. Just a tiny tiny dot.  Maybe I was seeing things!!!!

                                                                                         mike h

No I think you're right Mike. Another failure for the equation of separation limit/mag difference/aperture, and the table in the front of Sissy's book!

Tonight was stable enough to give me three nearly complete diffraction rings most of the time at x250 with the Mak. The near companion appeared as a dot just on the inside of the first ring at about 120 degrees PA. It's a nice triple!

Chris

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No I think you're right Mike. Another failure for the equation of separation limit/mag difference/aperture, and the table in the front of Sissy's book!

Tonight was stable enough to give me three nearly complete diffraction rings most of the time at x250 with the Mak. The near companion appeared as a dot just on the inside of the first ring at about 120 degrees PA. It's a nice triple!

Chris

I think that is why Haas is doing this project. The info on a few of these stars from the WDS just seems wrong.We should have not been able to see this maybe? I think Wilfried might like to hear about this as well. What do you guys think?

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The companion was certainly intermittent, but fleetingly distinct. The sky was very hazy with thin high cloud. Often this acts as a gentle filter. Often it's a blooming nuisance.

Yep, there's certain to be some anomalies around. Last year I made a note that ΟΣ6 ( Cepheus) looked far too wide at x300 for instance.

In addition, this is probably an easier way to get some input on the Sissy Haas project. Just drip feed one topical target at a time. It's a bit daunting to see a challenging list. Especially as here it's often just a short session in the gaps !

I was hoping for some tight challenges last night but the light pollution was so back that I could read without a red light.

Σ2356

Σ2358

Hu 936

β 137

ΟΣ525

Σ2430

Σ2448.......spotted !

Da 9

17 Lyrae

β975b

Ended up with a glowing M27,cute M56 and comet Jacques, hurrah !

Nick.

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I had a go with the webcam last night, although the seeing was not as good as previously. The Mag 9.1 tiny secondary star appears as a blip in the diffraction fuzz around the primary - I've stacked 4 frames to show this. The PA of the 9.1 companion is about 130 degrees.

I've rotated the image so that the mag 7.6 brighter companion is shown in its correct position (PA 349).

Chris

post-8142-0-44494400-1408354673.jpg

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Hey fellas , My friend Dr Wilfried Knapp of Austria had a go at this star system last night I guess that still would be the 29th i'm thinking . Using a 120mm refractor he caught a distinctive elongation. So we are pushing the envelope so to speak with our gear.

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How would we find this sort of thing if manually hopping with a dob/frac on an alt az mount? I cannot find this in the Cambridge DS book although I did find the STT catalogue on wiki. I suppose I could always look on Stellarium but I prefer a book in hand at the scope.

Cheers

Shane

Shane I was wondering if you have had any luck with this star system?

mike h

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