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Venus Transit 2004 France

Venus Transit 2004 France. Thierry Midavaine thimidav@club-internet .fr Club Eclipse AFA VT2004 7-9 may 2004 / Prague. Head lines. French Association Network Technical preparation Weather issues Time keeping Observation and recording Dissemination. French National Associations.

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Venus Transit 2004 France

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  1. Venus Transit 2004France Thierry Midavaine thimidav@club-internet .fr Club Eclipse AFA VT2004 7-9 may 2004 / Prague

  2. Head lines • French Association Network • Technical preparation • Weather issues • Time keeping • Observation and recording • Dissemination

  3. French National Associations • AFA • Networking of 170 local astronomical associations as Nuit des Etoiles event • “Ciel et Espace” june issue with several papers • Concours • Rencontres du Ciel et de l’Espace 2004 • SAF • Edition of a dedicated issue of « L’ASTRONOMIE »

  4. Other National Associations • Planète Science • Dedicated to support young and student groups • CLEA (Comité de Liaison Enseignant Astronome) • Web site • Network of french teachers and college class from Spitzberg to La Réunion island. • AUDE ...

  5. Club Eclipse • 16 members from Paris area • Activities around experimental projects • Missions in Observatories 60cm class telescopes • Transient events • Phemu • Occultation by asteroids and satellites • Detectors and acquisition process

  6. Technical Preparation • Systeme features • Location: Long Lat Alt in WGS84 frame, Time keeping • Optic:Filter transmission, Pupil diameter, focal length • Size and pitch of the detector • Spectral bandwidth • frame rate • frame recording format • Exploitation process

  7. Weather issues: Moving or not Theyr, GFS

  8. Time keeping at 1 sec accuracy • Quartz Clock • Atomic Clock through a communication link • Allouis emitter (French railway network) • LW radio France Inter • Speaking Clock through phone link • Internet:NTP Tardis, Dimension 4 • DCF 77 • GPS • Internal clock from PC

  9. NTP/GPS Comparison(Guillaume Dubos)

  10. Drift between the 15Hz frame rate of a Web cam and 1Pulse /sec from DCF77

  11. Acoustic timing

  12. Synchronisation test video/sound track Antenne Web-cam PC Microphone HP 1kHz

  13. Questions about the Venus Transit? • Is there is a real black drop effect? Or on the contrary a white or colored ring effect due to Venus atmosphere? • Does the contact occures simultaneously in every color, H, and Infrared due to sun atmosphere refraction

  14. Dissemination after the event • Rencontres du Ciel et de l ’Espace Paris 12, 13, 14, nov 2004 • Call for paper for a Venus Transit session

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