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Thread: Doubles and Baader T2 (Zeiss) prism.

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    Default Doubles and Baader T2 (Zeiss) prism.



    3/15/19

    It is getting close to the Full Moon but the weather last weekend was nice enough to get back to observing with larger scopes. I spent the evening splitting doubles with ES 127mm APO on manual Bresser Exos-2 mount. This was also my first (proper) light of Baader T2 (Zeiss) prism. Before I only tried it briefly in 80mm ED, but the sky was pretty bad. Here is my setup.







    Orion
    Tau Ori – triple – 3.6, 11.0, 10.9, ab 33.3”, ad 35.4”, yellow, white, white – this one was harder than looks on paper. I failed it in a few previous attempts, even with 8” SCT. This time I have managed first to resolve dim but sharp silvery spec of D with SLV 15mm (63x, 2mm exit pupil), and eventually dimmer B with SLV 6mm (159x, 0.8 exit pupil).

    Last year I have noticed that SLVs were particularly good on pooling faint stars. Since then they became my favorite EPs for splitting doubles. It feels that Baader prism complements nicely their performance. It provides excellent light scatter control, sharpness and rich star colors.

    STF 688 – double – 7.5, 7.6, 10.5”. Tight, nice looking pair of yellow stars. TV Plossl 26mm (37x, 3.5 exit pupil).

    At this point I have noticed that seldom visited Lepus is sitting in a nice spot below Orion. I have done only a couple of splits in this constellation, so I jumped on the opportunity to log a few more.

    Lepus
    HJ 3705 – double – 7.5, 9.6, 22.3”, white pair. It took some effort to pull the secondary and it appeared dimmer than mag 9.6.
    SKF 2473 – double - 6.8, 9.1, 71.2”, golden, bluish. Wider pair, but nice colors. TV Plossl 26mm (37x).

    Next FOV was what splitting doubles is all about.

    Iota Lep – 4.5, 9.9, 12” – was pretty on its own - cool blue secondary sitting next to the bright lemon colored prime. But in the same FOV was RX Lep – variable red giant of rich copper color. What a beautiful sight!

    Kappa Lep – tough but beautiful double – 4.4, 6.8, 2.2”. White and cyan stars side by side. Touching split with SLV 6mm (159x).

    GAL 378 – double – 7.8, 9.2, 39.1”, orange, purple.

    What can I say; Lepus is filled with colorful stars. However, it was setting behind the roof and I needed another target.

    Leo
    Gamma Leo – 2.4, 3.6, 4.7”. This is A+ quality pair, which everyone must see. Two orbs of liquid gold, one smaller than other, side by side. SLV 9mm (106x). I saw it many times and will see many more.

    STF 1447 – 7.5, 8.9, 4.4”, white pair. This tight split looks nice and you don’t have to work hard to get it. SLV 9mm (106x).

    At that point I took a break from the scope and played with Nikon 8x40 binos for a while. Bright Moon dampened my effort to locate DSOs; still enjoyed 8 deg wide and sharp views.

    Around midnight I had a bit of juice left for another split or two.

    Virgo
    STF 1560 - double – 6.4, 9.4, 4.9”, yellow, blue. SLV 9mm (106x).
    STF 1575 – double – 7.4, 7.9, 30.4”, yellow, white. Tv Plossl 26mm (37x).

    Herr Struve certainly knew how to pick them; most of his doubles are nice looking.

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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    Listing doubles was the Struve family business. Congrats on the nice night!

    https://en.m.wikipedia.org/wiki/Struve_family
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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    A excellent evening Bigzmey! Congratulations.
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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    Quote Originally Posted by not_Fritz_Argelander View Post
    Listing doubles was the Struve family business. Congrats on the nice night!

    https://en.m.wikipedia.org/wiki/Struve_family
    Quote Originally Posted by Gabby76 View Post
    A excellent evening Bigzmey! Congratulations.
    Thanks nFA and Gabby! Yes, the Struves are really fascinating family.

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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    An excellent night with the 127, Andrey!

    I am needing a good doubles night. It has been a while.
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    Bryan

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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    Wonderful doubles session Andrey!

    After testing my 'fracs on Gamma Leonis (Algeiba) and Castor for the past few weeks and admiring the beauty of Airy disk pairs, I'm now ready to start a new astronomy sideline (apart from logging and sketching DSOs) - double star observing.

    I was fortunate enough to visit the Dorpat (Tartu) Observatory in Estonia back in 2012, where Friedrich Georg Wilhelm Struve did his double star observing with the 9" Great Dorpat Refractor in the early 19th century.
    Terry
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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    Hello Andrey,

    and thank you for the amazing inspiration!
    I'll put your doubles on my to-do list for the next observing session under the waning Moon,

    JG
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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    Nice sessions...and targets, Andrey! Agree with your comments on Lepus...spent an evening double hunting in that constellation back in Feb 2017

    Really nice setup!!

    Dave
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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    Great evening with the doubles Andrey! Quite a haul and also excellent that you could do it in the presence of the moon. Nice set-up there.
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    Default Re: Doubles and Baader T2 (Zeiss) prism.

    Quote Originally Posted by bladekeeper View Post
    An excellent night with the 127, Andrey!

    I am needing a good doubles night. It has been a while.
    Quote Originally Posted by j.gardavsky View Post
    Hello Andrey,

    and thank you for the amazing inspiration!
    I'll put your doubles on my to-do list for the next observing session under the waning Moon,

    JG
    Quote Originally Posted by helicon64 View Post
    Great evening with the doubles Andrey! Quite a haul and also excellent that you could do it in the presence of the moon. Nice set-up there.
    Thanks guys! I hope I am not boring you with my doubles because there are more to come.
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