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Thread: Trying to view Jupiter with a 10” scope.

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    Default Trying to view Jupiter with a 10” scope.



    I last few time I set the scope up, trying to look at Jupiter, or Saturn, all I get is a bright white star on both. I can make out the rings on Saturn, but it’s still just a bright white light.is it just the time of the year?

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    Default Re: Trying to view Jupiter with a 10” scope.

    It may be a combination of things, what eyepieces are you using, what are the sky conditions like, is the Moon up, is your collimation good, etc
    We can most likely help you figure it out.
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    Default Re: Trying to view Jupiter with a 10” scope.

    Their position in the sky is not optimal, they are low and looking through that much atmosphere affects the view. Good collimation of the scope is critical. A variable polarizing filter will help with the glare and likely improve your view.
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    Default Re: Trying to view Jupiter with a 10” scope.


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    Default Re: Trying to view Jupiter with a 10” scope.

    Thank for the reply’s, the Sky is very clear, no moon, I’ve tried a bunch of lenses, but haven tried a filter, I do have a bunch of them, will try one the next clear night. Thank you.

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    Default Re: Trying to view Jupiter with a 10” scope.

    Quote Originally Posted by nortonz View Post
    Thank for the reply’s, the Sky is very clear, no moon, I’ve tried a bunch of lenses, but haven tried a filter, I do have a bunch of them, will try one the next clear night. Thank you.
    This is your telescope... https://astromart.com/images/classif...5/432116-2.jpg

    A 10" mirror gathers a lot of light from an object, especially a bright object. In the observing of the planets, 1.25" eyepieces are generally used, even with a 1200mm focal-length. In theory, your telescope can, if well-collimated, reach 500x(10 x 50x), but given our atmosphere(think soup), 300x and below is more practical. The planets become interesting at around 150x, but with the 10" apertture let's bump that up to 200x at least...

    1200mm ÷ 200x = a 6mm eyepiece, or a 12mm combined with a 2x-barlow; at the minimum of 150x, an 8mm eyepiece. Therefore, to dim down the light to see the planet's details and subtle colours, you will need a 1.25" variable-polariser; for examples...

    https://agenaastro.com/bst-1-25-vari...ng-filter.html
    https://agenaastro.com/bst-1-25-tele...ce-holder.html
    https://agenaastro.com/celestron-var...-25-94107.html
    https://agenaastro.com/optolong-1-25...ng-filter.html
    https://agenaastro.com/lumicon-varia...lter-1-25.html

    The variable-polariser acts as an indoor-lighting dimmer, but for the telescope instead...

    https://i.imgur.com/it4lX3X.jpg

    https://i.imgur.com/8FJhRRM.jpg

    The star-like appearance is caused by the spider-vanes of the telescope's secondary-mirror assembly there at the front of the tube...

    https://i.imgur.com/8w2YIRL.jpg

    The variable-polariser will reduce and even eliminate that effect.

    Jupiter was, or still is, at opposition, at its brightest, and all the more reason to dim it down. You will then see the planet's details and colouring. It worked for me on Mars as well, last year, and during that planet's opposition...

    https://i.imgur.com/NyNhESo.jpg
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    Default Re: Trying to view Jupiter with a 10” scope.

    Wow that answers a lot. I’m new at this, even though I’ve had this scope for 10 years. This is the first time I have been able to use it. We just moved on to 2 Acres. So I have a lot of room to set it up. Even built a roll around cart so I don’t have to take it apart, and put it together every time I want to use it. I bought a case full of lenses, and filters from Celestron when I bought the scope. So the next clear night I will try one of the filters. Thank for all your useful info. I appreciate it a a lot.
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    Default Re: Trying to view Jupiter with a 10” scope.

    Jupiter was, or still is, at opposition, at its brightest, and all the more reason to dim it down. You will then see the planet's details and colouring.

    Thanks for the tip. Jupiter's colors for me have been muted this summer from my backyard, which I attributed to suburban light pollution. I ordered the Celestron variable polarizer this weekend and it arrived today. The next time I get some clear skies, I will try it out.
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    Default Re: Trying to view Jupiter with a 10” scope.

    Here's an afocal shot I took on 10/19/2015, by hand-holding a small point-and-shoot camera up to the lens of the eyepiece, and of Jupiter through my 6" f/5 Newtonian...

    https://i.imgur.com/VMBhAAf.jpg

    There it is, blinding-white, washed-out, and the spider-vanes shining through. I then went into the house and got my variable-polariser. Once I had dimmed the planet down, I suddenly saw glory: festoons and whorls within Jupiter's equatorial bands, and the planet's subtle colouring. Utterly gone were the effects of the spider-vanes. The image of Jupiter, to my eye, appeared like a NASA broadcast on a vintage CRT colour television. But that excellent seeing lasted only for a few seconds, and back it went to being blurred a bit. You have to be patient whilst observing, else you will miss those fleeting glimpses as I had seen that night. Why, you could turn your head away from the eyepiece for just a moment, and you will have missed what you did not see.

    I can only hope to see that sight again someday.
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    Default Re: Trying to view Jupiter with a 10” scope.


 

 
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