Galilean satellites in 2021, ALPO-Japan Latest
Mutual eclipse and mutual occultation between Galilean satellites 2021/08/09(UT)
About every 6 years, the Earth crosses the same orbital plane in which Jupiter's satellites orbit the planet. When this happens,
like this year, it is possible for a few weeks to observe reciprocal occultations and eclipses between the moons of Jupiter.
The night of August 8th was a truly unique opportunity to image two of these PHEMUs (as they are often called,
from the French word "Phenomene Mutuel"), as a double event clearly visible for Asian observers took place:
an occultation between Ganymede and Europa was followed by an eclipse between the two.
Ganymede passed in front of Europa and just more than an hour later it cast its shadow on the smaller moon.
As the night turned out quite clear, I collected hundreds of 30" videos which I then processed to obtain sharp images of these satellites every half minute,
images which I then combined to create two short videos that condense both these incredible events in a few seconds.
The occultation video comprises 110 x 〓30" videos stacked and sharpened, the eclipse one 100 x 30".
I let you imagine the amount of work to create these videos!
I also created a panel with the most significant shots used in the videos. Just a reminder to everyone,
the apparent size of these moons are really very small, Ganymede was 1.8" and Europa only 1" the night of imaging,
the latter equivalent to observing a dollar cent from a distance of two miles and a half..
On occultation I used a luminance filter. On eclipse being the planet lower I used a red filter.
Any use,diffusion or unauthorized publication is prohibited.
再利用・転用・改ざん禁止
[Marco Lorenzi : [Singapore,Singapore]
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