Jupiter and Ganymede near Opposition - Oct. 31, 2023 (Dale Hollenbaugh)

Contains: Solar system body or event

Jupiter and Ganymede near Opposition - Oct. 31, 2023

Acquisition type: Lucky imaging

Jupiter and Ganymede near Opposition - Oct. 31, 2023

Acquisition type: Lucky imaging

Jupiter and its largest moon Ganymede - one night before closest approach to Earth for 2023 and two nights before opposition. Oct. 31, 2023 @ 2:54AM (06:54 UTC).

This is my best photo of Jupiter to date and the first time that I have gotten any surface detail on Ganymede.

This is my second time imaging Jupiter this season and the second session using the Obsession 20" F/5 Dobsonian reflector, which I still find very challenging to use. In an effort to try to gain a bit of focus in-travel, I moved the primary mirror forward as far as I could using the collimation screws. I ended up collimating the scope three times during the night as it as it would drift as I repositioned to different targets. And I think I got the ADC horizon setting incorrect again, as my correction was significantly off. I definitely improved over my previous session, I think mainly due to collimation. According to Astropheric, transparency was above average and seeing was below average, but there were moments of decent seeing and this image was the best of the night. The dropped below freezing overnight and got down to -3C (26F). For planetary imaging, aperture rules and jumping from my C11HD to the Obsession 20" has improved things, but it much harder to use.

Obsession 20" F/5
D=508mm, L=2,556mm
Televue Powermate 4X
Effective focal length = 10,224mm @ f/20
Gain 275
Exposure 20ms
Best 5% stacked

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Jupiter and Ganymede near Opposition - Oct. 31, 2023

Jupiter and Ganymede near Opposition - Oct. 31, 2023

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