Jupiter - 2nd April

[iceman]

Hi guys

Captured this Jupiter yesterday morning in good conditions. Seeing was above average, but my alignment was way off and I had to keep adjusting to keep the planet in the FOV (literally, continously). I think the constant movement had an effect on the fine detail in the image which I feel could've been better.

The planet is now over 40arcseconds and getting bigger!

Nothing like Anthony's fine image but probably my best GRS this season.

Thanks for looking.

[Ric]

Hi Mike, those are great images and a lot of detail is present. The GRS certainly has some detail as well.

Top stuff

[matt]

Very nice, Mike.

They look a little dark on my screen, but perhaps that's just my lappie?

Like my Jupiter images of late, there are a few rings there at the limb.

I note your comment about having to keep adjusting the planet to keep it in the FOV. I'm doing a lot of that too. I wonder if that's contributing to the onion ring issue?

It reminds me I must spend some time on my polar alignment at the beginning of the night.

Cheers:thumbsup:

[bird]

Still a very nice image Mike, you never know when you'll get a hubble night like you had a couple of weeks ago...

Onion rings can be caused by a few things, but the basic reason is not enough shades of colour in the final image. You have to look at your capture and processing, and see where the loss is happening. Maybe try adjusting the gamma for a brighter image when you capture in case the gamma is causing th problem. You can always turn the gamma back down on the final image.

regards, Bird

[matt]

Bird

In our recent discussions you indicated gamma can be quite destructive to detail.

I'm sure it's a matter of degrees.

How much gamma is too much/ too little??

I'd be interested to hear how much gamma folks are using in their capture?:)

[iceman]

Thanks for the comments.

The onion rings are only appearing in the Luminance data, which i'm capturing at 30fps (1/30s) with a full histogram (gain at 85%). It appears immediately after wavelets processing in registax. It didn't/doesn't appear on the colour channels from the same session.

I'm really not sure what's causing them. While the seeing was good, the planet did change shape quite a bit and I wonder if it's caused by not enough data around the limb after stacking, due to the shape-shifting.

I already capture with a medium gamma setting (12) with the DMK.

[bird]

Ok, I guess that's another possibility, but even so you should get smooth transitions.

have you tried resampling the data in ninox before feeding it through registax? That might allow registax to get a more accurate alignment and smooth out the limb.

Yuu could try either -resample=3/2 or -resample=2 and see what happens. It will be slower for sure :-(

cheers, Bird

[bird]

Also maybe try less wavelets, including turning off the layer 1 completely, and then use ME deconvolution in astra image. It seems to do a good job of rejecting some kinds of sharp transitions (eg noise and sharp edges).

If you resample in ninox then keep the image at the larger size until you're finished in astra image before downsizing it.

cheers, Bird

[davidpretorius]

well done Ice, and top tips Bird

[matt]

Bird

All this talk of command line entries and ninox is making my head spin:lol:

I think I'm going to have to ask for a small amount of your time during our next get-together to show me how to perform this resampling.

Hope that's OK?

[bird]

Matt, probably better to arrange this on a non-imaging night so it doesn't take away from time at the scope :-)

have you downloaded ninox? The link is http://www.acquerra.com.au/astro/software/ppmcentre

regards, Bird

[ving]

i was doning the whole visual thing on jupiter the other night... you remember visual dont you? anyhow, yeah its getting big.
nice image mike. you probably need to spend more time on alignment to make things easier for you :)

[Dennis]

Another set of wonderful Jupiter images Mike - well done.

Cheers

Dennis

[matt]

Of course. Whatever suits:)

[RB]

Well done Mike, nice detail and presentation.

[acropolite]

Excellent detail Mike, I remember it wasn't all that long ago you were chasing Jupiter manually with your dob..

[iceman]

Thanks for all your comments.


heh, it felt like I was imaging with a dob again it was drifting so much.. however it was much easier to keep it in the FOV with a hand controller, than it was pushing the dob around.