parece que el tal Julian Wessel ha confesado que la foto del tránsito de la IIS sobre Saturno es un fake. Es una composición de dos tomas de sesiones distintas:
http://asterisk.apod.com/viewtopic.php?f=9&t=35581&start=25#p253283
Me parece una desvergüenza porque en su web da a entender que realmente capturó el tránsito:
The setting was a short exposure time due to the small amount of time in which the event happens combined with a high gain to illuminate the two objects with an apparent magnitude of...
I got into this event by calculating the next transits of the ISS in front of a celestial body. Calsky.com is the perfect tool in preparing these transits. It shows you the "Transit Line", which indicates the place on the ground, where you have to place your equipment for perfect alignment of the two objects. In this case the transit line was only 40m wide, so I had to chose my observing location precisely.
Este otro mensaje en Asterisk es muy interesante:
http://asterisk.apod.com/viewtopic.php?f=9&t=35581&start=25#p253294