Jupiter double transit and eclipse, 8 August 2021

[Tulloch (Andrew)]

There was 100% cloud cover when I set up last night and didn't clear up until after 10:00 when the clouds suddenly cleared off. Jetstream speeds were still in the dark red (>45 m/s) but there was a promise of a double moon transit across Jupiter. After taking a number of videos where the results were poor, the seeing suddenly improved for around 30 minutes and I was able to capture Europa and Ganymede transiting the planet, while Io disappeared into Jupiter's shadow.

Attached is an animation showing a minute by minute display of the moons, where it is possible to see differential movement of Ganymede with the planet, Io disappearing behind Jupiter's shadow and Europa slowing catching up to Ganymede.

Don't forget about the upcoming double moon occultation between Europa and Ganymede while transiting Jupiter on Sunday the 15th - this is an all-nighter for sure! Hopefully the weather somewhere across Australia will allow someone to capture this rare event. More details here.
https://www.iceinspace.com.au/forum/...d.php?t=192542

[Anth10 (Anthony M)]

Andrew,
Great show here- like the passage of the moons and the shadows cast on the surface. Makes for a curtain raiser for the event not far away.
Interesting gif really puts you at the scene.
Well done really like your work and we will all have our eyes peeled on the 15th.

Jupiter is like the Harlem globe trotters putting on all the tricks!

A

[Saturnine (Jeff)]

Excellent work, not giving up when the seeing was crap payed off. Great to see what I missed out on because of clouds and rain up here.

So looking forward to Sunday night , Monday morning

[Retrograde (Pete)]

Excellent Andrew!

Really liked the gif.

[Eris (Gerard)]

Great stuff Andrew. Really impressive!

[cometcatcher (Kevin)]

That's awesome! Of course it was cloudy here and looks like the 15th will be cloudy also.

[multiweb (Marc)]

Awesome capture.

Originally Posted by Tulloch

Don't forget about the upcoming double moon occultation between Europa and Ganymede while transiting Jupiter on Sunday the 15th - this is an all-nighter for sure! Hopefully the weather somewhere across Australia will allow someone to capture this rare event. More details here.
https://www.iceinspace.com.au/forum/...d.php?t=192542

Looks like it will be clear here. Fingers crossed. Do you think we'll be able to see anything against the planet background? Might have to barlow a fair bit. IR or straight LUM?

[Tulloch (Andrew)]

Originally Posted by multiweb

Awesome capture.

Looks like it will be clear here. Fingers crossed. Do you think we'll be able to see anything against the planet background? Might have to barlow a fair bit. IR or straight LUM?

Thanks - it should look exactly the same as the animation above, as the moons are the same. Europa will be bright, Ganymede dark, and the shadows will look black. The bright Europa will pass between Ganymede and Jupiter, it would look better the other way around but it is what it is.

I used a 9.25" SCT at around f/21 for these captures (so about a 5m focal length). I will also be capturing in colour...

[multiweb (Marc)]

Originally Posted by Tulloch

Thanks - it should look exactly the same as the animation above, as the moons are the same. Europa will be bright, Ganymede dark, and the shadows will look black. The bright Europa will pass between Ganymede and Jupiter, it would look better the other way around but it is what it is.

I used a 9.25" SCT at around f/21 for these captures (so about a 5m focal length). I will also be capturing in colour...

Cool. Thanks. I'll set up Saturday and rehearse. It's been a year since I did any planetary last.