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Thread: Sunday afternoon Sun observation at observatory Rijswijk

  1. #1
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    Default Sunday afternoon Sun observation at observatory Rijswijk



    Every year a special afternoon is organized for observing the Sun. Last Sunday it was "Sunday".
    It was half clouded, so with some patience the public was able to see the Sun. The stopped down 14", the Astrophysics Starfire with full 130mm aperture, the 40mm Lunt for H - Alfa observations were pointed at the Sun. A homebuild spectograph showed the spectrum and the Fraunhofer lines.
    Belowdeck the public was informed about several aspects of the Sun. When they came up, they could observe the Sun in three different ways: Normal light, H-Alfa and the spectrum.

    The 130mm Starfire showed a tiny little sunspot in visible light. It was quite a challenge for the public to locate this ever so small spot. Most of them failed, many of them noticed some granulation though. Experienced observers saw a small double spot, with an even smaller companion and an unstable area around it. Amazing that the experienced eyes see so much more.

    Less challenging and far more spectacular was the spectrum of the Sun with its Fraunhofer lines in it. The public could actually live see the lines which they were told about belowdecks. The H-alfa image ( live too) showed a little solar flare at the edge. ( in the morning only) and the well known hydrogen structures.

    People were enthusiastic about these "three ways to see the Sun". Some 30 people visited us.

    The "Spectograph" was a graceful example of simpliciy. The owner had made a very narrow elongated opening in a closed cartonbox tube, three narrow diafragms in the tube and a narrow Ronchi lightgrating at the end. Even then it was necessary to direct the instrument at the clouds because of the Sun beeing too bright. No optics needed. In a way we were happy to have some clouds. Total costs 10 dollars. I heard people shouting of excitement, "Wow"!! I was pretty amazed too.

    In the picture the spectograph can be seen on the left (with the red cloth for sunlight-blocking), the Starfire in the middle, the grumpy old man on the right is me. The Lunt is above, just outside the pic.

    [IMG]Sun observation afternoon 2019 by John Baars, on Flickr[/IMG]
    Last edited by John Baars; 07-09-2019 at 09:53 AM. Reason: typo
    Telescopes in Schiedam : SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    Hello John,

    very very interesting.
    Could you please expand more on the DIY solar spectrograph. It might be of interest for many folks here.
    Thank you for sharing,

    JG
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    Such a cool event.
    Makes me renew my determination to get my solar filter one of these days...
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    A fine report John and thank you for sharing it
    Solar viewing has always been a favorite.
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    An awesome day, John! Thanks for sharing the experience with us.
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    Fun event, thanks for sharing!
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    Hello all,
    Thanks for your reactions.
    I will ask the owner for a more comprehensive description of his DIY Spectrograph and make a new thread of it here on the Forums.
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    Hi John. Thanks for the superb report from the crew at the observatory at Rijswijk with the the 130mm Astrophysics Starfire telescope. This is a "dream scope" for many of us. Thanks for your wonderful report John, and I hope to see some solar images soon.
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    Quote Originally Posted by Makuser View Post
    Hi John. Thanks for the superb report from the crew at the observatory at Rijswijk with the the 130mm Astrophysics Starfire telescope. This is a "dream scope" for many of us. Thanks for your wonderful report John, and I hope to see some solar images soon.
    The Starfire is a "dream scope" indeed. Images of Jupiter for instance are superb compared to my 120mm f/7.5 ED APO 0.96 Strehl Skywatcher. The last one is rather good, but still one has no difficulty to see differences between the two.

    Being an observatory with a small budget, we were glad to buy one secondhand. It was one in a million chances!
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    Default Re: Sunday afternoon Sun observation at observatory Rijswijk

    I was teaching a training course there many years ago. I've spent most of my time training in Maastrict and Hilversum, though. An optician once ran out of his shop when I was using Baader filters and binoculars to view sunspots. He'd never heard of them before.
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