The methane filter (CH4) is a filter whose very narrow transmission is centered around one of the CH4 absorption band in the near infrared at 890 nm. That filter is very interesting because in contrary to all others, it does not reveal information relative to color differences (the albedo) but…
I have participated last week-end in London to the amateur session of the European Planetary Science Congress (EPSC) 2013. A great moment for amateur astronomy but not only!
In 2012 we saw the amateurs broke a new border by imaging for the first time non ambiguous details on Uranus. In 2013, this is maybe the turn of Neptune ! But what can we see on Neptune ? Neptune is planet rather similar to Uranus: its very cold color…
There are many processing software for planetary imaging, and many are excellents. But to finalise the processing, and whatever software I have used, I always go back to Registax 6 ! Here is why…