Venus Transit 2004 France
description
Transcript of Venus Transit 2004 France
Venus Transit 2004France
Thierry Midavainethimidav@club-internet .fr
Club Eclipse AFAVT2004 7-9 may 2004 / Prague
Head lines
French Association NetworkTechnical preparationWeather issuesTime keepingObservation and recordingDissemination
French National Associations
AFANetworking of 170 local astronomical associations as Nuit
des Etoiles event“Ciel et Espace” june issue with several papersConcoursRencontres du Ciel et de l’Espace 2004
SAFEdition of a dedicated issue of « L’ASTRONOMIE »
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 ...
Club Eclipse
16 members from Paris areaActivities around experimental projectsMissions in Observatories 60cm class
telescopesTransient events
Phemu Occultation by asteroids and satellites
Detectors and acquisition process
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
Weather issues: Moving or not Theyr, GFS
Time keeping at 1 sec accuracy
Quartz ClockAtomic 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
NTP/GPS Comparison(Guillaume Dubos)
écartTC-DC77
0.00066
0.000665
0.00067
0.000675
0.00068
0.000685
0.00069
0.000695
0.0007
numéro d'image
eca
rt e
n f
ract
ion
de
jo
ur
écartTC-DC77
Drift between the 15Hz frame rate of a Web cam and 1Pulse /sec from DCF77
Acoustic timing
Synchronisation test video/sound track
Antenne
Web-cam PC
Microphone
HP
1kHz
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
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