On the evening of March 8th I captured some videos of planet Jupiter and its four Galilean Satellites. At first I took a video without any filters, so that when the satellites are clearly seen, the planet image is overexposed, « burnt », without planetary details. This is normal with any unfiltered video or photograph of the planet and satellites, because the difference of the brightness level is really huge! To get Jupiter correctly exposed, one would need to under-expose the satellites, which would then be « invisible ».
Then I captured a video with a Methane-Band filter. The result was a clear image of the planet, with its bands and belts photometrically « visible », and all satellites at the same field of view. This filter is designed to allow only the pass of light of frequencies close to 891 nm in the Near-Infrared spectrum. At this band, the light emitted by Jupiter (and all other gas giant planets) is substantially reduced due to a great amount of absorption caused by the presence of Methane molecules in the upper atmosphere. This behavior of light in the clouds of Jupiter was first presented to the astronomical community by Erich Karkosha in a great paper that was published in Nature Journal in 1994. « Spectrophotometry of the jovian planets and Titan at 300- to 1000-nm wavelength: The methane spectrum« http://adsabs.harvard.edu/abs/1994Icar..111..174K
The following graph from this paper illustrates the high absorption in the 890 nanometre wavelength. Back in 2009, I had used this filter in a rare observation of the occultation of star 45 Capricorni by planet Jupiter from Athens, Greece. Since the star did not just immediately disappear, but it emerged gradually behind the upper atmosphere, an international campaign was organized and many amateur and professional astronomers took part. Light curves of this occultation were produced and analyzed by astronomer Apostolos Christou, and the final result was a paper published in Astronomy & Astrophysics Journal « The Occultation of HIP 107302 by Jupiter »