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Center of observations Observatory Rimavsk Sobota in central Slovakia on south boundaries of republic. Public observatories - 20 observatories ...

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Venus Transit 2004

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Venus Transit 2004in Slovak Republic

  • Roman PIFFL, Slovak Union of Amateur Astronomers

Brandýs nad Labem, May 7 - 9, 2004

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Wide colaboration

  • Professional institutions

    Astronomical Institute of Slovak Academy of Sciences

    Slovak Astronomy Society

    Astronomy Departure, Komenius University

  • Slovak Union of Amateur Astronomers (SZAA)

    14 regional organizations, 400 members

    Center of observations – Observatory Rimavská Sobota in central Slovakia on south boundaries of republic

  • Public observatories

    - 20 observatories

  • Basic and secondary schools

    - more than 50

  • Individual observers

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Public observatories in Slovakia

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First contact in Slovakia

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Fourth contact in Slovakia

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Duration of transit in Slovakia

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Peter Zimnikoval´sAid Before Transit

Our friend has very open mind and he prepared for us 2 aids.

  • 1. Venus mask

    This mask may be useful to determine times of 2nd and 3rd contact during the transit of Venus across the Sun.

  • 2. Transit simulator

    This software simulate transit of Venus across the solar disc on June 8, 2004. The software gives a basic images about progress of an astronomical phenomenon which nobody of us seen. Therefore may be useful as the training before observations. It shows problems with measurement of time of single contacts, too. But it is only poor imitation of the reality.

    Both you can find on

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Programme of SZAA

  • Construction of web-pages

  • 9 observational projects

  • Taking some data

  • First and fourth contact in focal plane of coronagraph + color CCD camera SoftHard Technology

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2. Second and third contact in 16-cm refractor with 2x teleconverter (f=4900 mm) + bw CCD camera SoftHard Technology

3. Details of transit of Venus in 16-cm refractor with 2x teleconverter + bw CCD camera SoftHard Technology

4. Transit of Venus: taking pictures of whole solar disk with Venus 300 mm teleobjective with 2x teleconverter (f=600 mm) + bw CCD camera SoftHard Technology

5. Video of Transit (90/1000 mm refractor + CCD TV-camera Oscar + DCF-time inserter + videorecorder)

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  • Popularisation

    6. On-line web-camera on pages

    7. Web-camera on azimutal mount

    8. Direct „classical“ photography in focus of Coude-refractor (8 cm diameter of Sun in focal plane)

    9. Grant for secondary school student – reconstruction of Maximillian Hell´s observation on June 3, 1769 in Vardo

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Our problems

  • How determine a correct time of contact, exactly don´t known:- where is solar limb?- how large is Venus disk on our pictures?

  • On 4900 mm focus is diameter of Venus theoretically 206 pixels. Uncertainity 1 pixel means in time uncertainity about 6 second...

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I don´t understand, how in 1882 and before would have taken some precise data ;)

Clear sky and good luck!

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