Taken from my back patio a few nights ago. Jupiter, Ganymede and Io (plus Ganymede's and Io's shadow transits).
(captured at ~2020-08-15 05:06.9 UT over the course of 9 minutes [3 minutes each for Red, Green, Blue channel]).
Ganymede is easily seen to the right of Jupiter. Shadows of Io and Ganymede are easily seen on Jupiter from left to right, respectively. Io itself is
technically visible in the image, just below Ganymede's shadow on the same band edge as its own shadow, but is blending into the background clouds so seamlessly it's practically invisible. Io is performing one heck of a camouflage effect. It can't hide from its own shadow though.
Acquisition details:
Equipment:
Telescope: Meade 10" LX200-ACF mounted on an equatorial wedge
Camera: ZWO ASI290MM
TeleVue 2x Powermate (essentially a Barlow lens) to bring optical system to f/20, focal length 5000 mm.
ZWO Atmospheric Dispersion Corrector (ADC)
ZWO EFW Electronic Filter Wheel
Astronomik Deep-Sky RGB filter set
Adjustments of Atmospheric Dispersion Corrector (ADC) was done visually using an eyepiece immediately before swapping the eyepiece with the filter wheel + camera. (Atmospheric dispersion effects are a lot easier to detect in color, rather than when using a monochrome camera.)
Midpoint timestamp of acquisition: ~2020-08-15 05:06.9 UT, in order of Red, Green, then Blue, 3 min each.
(Total amount of raw data: ~90 GB. That's not a typo. Ninety gigabytes. Almost a tenth of a terabyte. Around 30 GB per channel)
Software and processing:
Autostakkert!
Registax
WinJUPOS
Gimp
(All software packages are free, btw.)
Each channel (Red, Green, Blue) were stacked separately using Autostakkert!
Each channel image was then processed separately using Registax's wavelet sharpening.
Channel images were then de-rotated and combined using WinJUPOS.
Gimp was used for color, contrast and brightness adjustments, and final cropping. Also Gimp was also used for bit of color alignment retouching involving the moons and their shadows (see below).
Jupiter rotates quite quickly, making a full rotation in only about 10 hours. As a rule of thumb, any image or image sequence (of Jupiter) longer than ~3 minutes will show signs of rotation (blurring, etc). My image sequence is 9 minutes total, so I need to account for this. WinJUPOS software can "derotate" images of Jupiter by several minutes, so I used that to derotate the Red and Blue channels to match up with the Green.
WinJUPOS worked quite well for Jupiter itself, but unfortunately, Io, Ganymede and their shadows do not move at the same speed as Jupiter's rotation. So the end result left a little color fringing around the moons' shadows and Ganymede.
So I used Gimp's warping tools to gently "nudge" the reds and blues into the greens in the areas of the moons' shadows and Ganymede (I didn't touch Io itself, since that wasn't even discernible in the individual channels either). I concede that this "nudgining" isn't a particularly graceful solution, but, well, what else am I going to do.
Overall though, I'd call the image mostly a success.
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