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The Venus transit of 2012

Scientific collaboration in the 21st century

In 2004, a campaign of coordinated measurements was established, delivering impressive images that have been studied and recently published scientific paper (P. Tanga et al., Icarus 218, 2012, 207-219).

Auréole
The aureola effect: evolutionof the bright limb of Venus. Credits: Rondi

 

For 2012, Thomas Widemann of the Observatory of Paris / Meudon (Paris, France) and Paolo Tanga of the Observatory of the Côte d'Azur (Nice, France) developed a coronagraph especially to observe the transit of Venus:


The instrument has been tested and nine copies were built. These copies will be divided amongst teams all over the Earth. This network of instruments for observing the transit forms the Venus Twilight Experiment (Venus TEx).

Venus TEx: 9 identical coronagraphs will observe the transit
# Observatory Site Observer(s) Filters
1 Mees Solar Obs. Haleakala, HI, USA

J. Pasachoff, B. Babcock

B (450 nm)
2 Mobile station Hokkaido, Japan T. Widemann, T. Fukuhara V (535 nm)
3 Moondara Obs. Mount Isa, QLD, Australia L. Fulham, F. Braga-Ribas I (760 nm)
4 Tien Shan Obs. Kazakhstan F. Colas, F. Vachier B
5 Lowell Obs. AZ, USA W. Sheehan V
6 Lowell Obs. AZ, USA P. Tanga V
7 Taiohae Nuku Hiva, Marquesas Is. C. Veillet R (607 nm)
8 Mobile station Svalbard Is., Norway A. Mahieux and VEx team I
9 Udaipur Obs. India A. Ambastha, P. Machado R

As T. Widemann explains, two phenomena in particular can be studied during the transit of Venus:


The objective of simultaneous measurements is to study the aureole effect, visible at the first and third contact points of the transit.

 

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