PDA

View Full Version : Frenchman captures images of surface of Venus



Chip
2004-Aug-15, 08:22 AM
From his backyard! The night side of Venus is warm enough to give off infrared light which amateur enthusiast Christophe Pellier was able to capture via a series of careful steps using a 14 inch Schmidt Cassegrain.

Knowing that the dark side of Venus glows at 1 micron in infrared, Monsieur Pellier employed a variation on an exposure technique involving a 1 micron infrared filter with multiple stacked exposures. This particular technique of multiple images taken over many nights from Earth, has not been achieved before by amateur observers. UV cloudtop images are also outlined on his website (http://astrosurf.com/pellier/venus2004soir/).

The infrared imaging technique seems particularly applicable to Venus as the planet’s dark side glows in infrared which penetrates the thick cloud layers. Here are his infrared images (http://www.lpl.arizona.edu/~rhill/alpo/venustuff/recobs.html).

Christophe Pellier’s webcam pictures of other planets (http://astrosurf.com/pellier/capteurnb) are very good too. (These pages are in French.)

This is one of those cases where professional astronomers are also interested in his work as it is the only example so far of observations over time of the changing surface of Venus.

Félicitations pour votre excellent accomplissement, M. Pellier!

AK
2004-Aug-15, 09:49 AM
Sacre bleu!

:)

Diamond
2004-Aug-15, 03:00 PM
Christophe Pellier’s webcam pictures of other planets (http://astrosurf.com/pellier/capteurnb) are very good too. (These pages are in French.)

This is one of those cases where professional astronomers are also interested in his work as it is the only example so far of observations over time of the changing surface of Venus.

Félicitations pour votre excellent accomplissement, M. Pellier!

Je comprends le francais trés bien!

Basically he's photographing the planets in black and white through red, green and blue filters and then recombining to produce a colour picture, exactly the way its done by the space probes.

Chip
2004-Aug-15, 08:08 PM
Basically he's photographing the planets in black and white through red, green and blue filters and then recombining to produce a colour picture, exactly the way its done by the space probes.

Except directly from la terre, without the expense of a rocket launch. :wink:

The infrared pictures allow a deliberate over-exposure of the sunlit side and draw out subtle details on the dark side.