A Jovial time in Brisbane

[Camelopardalis (Dunk)]

Folks,

We've had a couple of nights of half decent seeing this week before the weather reverts back to summer humidity and storms again

This is the first effort, having sifted through much of the data and having a messy stab at derotating...note the splodgy Ganymede in the top-left I have some extra frames from before the transit started that I'll try and put up later.

Taken with my C11 EdgeHD / NEQ6 / ASI224MC from my square metre of scope space here in Brisbane.

As always, suggestions/recommendations for improvements welcomed - derotating is a tricky business

Edit: added a second image from one of a short image sequences...no derotation but a little heavy handed wavelet application Ganymede is a easier to discern as it's not smudged like in the derotated image, but the details are less clear and it looks...mmm...can't put my finger on it

Edit2: added an image from slightly earlier before showing Ganymede on approach to transit and Callisto just sneaking behind. Not de-rotated, just stacked and waveletted.

Cheers,
Dunk

[oernulfs (Ørnulf)]

I know little or nothing about derotation, but I know that so far I have not been able to reveal so many details as you have in your image (I have a C9,25). Nice work

[Camelopardalis (Dunk)]

Thanks Ørnulf! You should give it a try and see if brings out any extra details

[AstroJason (Jason)]

Nice one mate, some great details there. Is this the first time you have used your new ASI224MC?

[RobC (Rob)]

A lot of detail there. How necessary is it to de rotate ?

Cheers

Rob

[Camelopardalis (Dunk)]

Originally Posted by AstroJason

Nice one mate, some great details there. Is this the first time you have used your new ASI224MC?

Thanks Jason! Yeah it's the first time the 224 had been used in anger

Originally Posted by RobC

A lot of detail there. How necessary is it to de rotate ?

With Jupiter you can eek out more detail if you derotate because it rotates so quickly that the details can suffer motion blur if you stack frames from a single capture sequence lasting more than a couple of minutes.

[sharptrack2 (Kevin)]

What is meant by de-rotating? Are you referring to the planet rotation or camera rotation?

I've decided I want to do solar system observing/photography and this has me a little confused.

[Camelopardalis (Dunk)]

Derotating...check out WinJUPOS...it works some magic on your data to try and reverse the motion blur I described above.

Btw, this is the planet's rotation not the camera...the stacking software doesn't care about a little field rotation, in case you're using an alt-az mount.

[sharptrack2 (Kevin)]

Thank you Dunk,

Not quite ready to photograph yet but learned a long time ago to ask questions when they come up. Appreciate your reply.

Great images BTW!

[andyc (Andy)]

Nice shot Dunk! Love the bit of detail on Ganymede in the 2nd shot

[Somnium (Aidan)]

getting some good detail there Dunk

[Camelopardalis (Dunk)]

Originally Posted by sharptrack2

Thank you Dunk,

Not quite ready to photograph yet but learned a long time ago to ask questions when they come up. Appreciate your reply.

Great images BTW!

Thanks Kevin! Never fear asking questions

Originally Posted by andyc

Nice shot Dunk! Love the bit of detail on Ganymede in the 2nd shot

Thanks Andy! I was surprised about the Ganymede markings myself - pretty chuffed! I have some more sequences before Ganymede got so close, and with Callisto just playing peek-a-boo as it was occulted. I'll have to take a closer look and post 'em

Originally Posted by Somnium

getting some good detail there Dunk

Thanks Aidan! We are at the mercy of the seeing