Jupiter from this morning

[iceman]

Another attempt at Jupiter this morning.. sadly conditions were no better than yesterday. Transparency was better, but seeing was terrible and by the time Jupiter rose high enough to start getting stable, clouds forced me to give it away for the day.

Not much to identify in the way of features at this poor resolution, but the SEB seems to have settled down and is now looking quite normal - though the NEB is still quite a bit darker.

12" newt on EQ6, DMK21AU04 @ 15fps.

Thanks for looking.

[edwardsdj]

Great that you've captured the great planet Mike :)

Hope conditions improve for you soon.

[ving]

its an improvement fromthe last one me thinks... :)
:thumbsup:

[Matty P]

Good effort Mike. :thumbsup: An improvement from your last one. :)

I'm sure the conditions will improve soon.

[davidpretorius]

features........it s a planet!!!:rofl:

:rofl:joop joop joop

[Alchemy]

going to grill you for information, probably do this for a while so get used to it:D

Was this frame rate for all the colours, are we talking LRGB, how many frames for each color and what time length from first frame to last frame (interested in rotation issues). thats it for now:)

[iceman]

No worries Alchemy, keep asking questions.

I used 15fps for all the colour channels, though the gain varied between channels. The green channel is the brightest, red is a little dimmer, and blue is the dimmest by a fair margin. So I adjust the gain between channels to keep the histogram at around the same point for each channel.
Sometimes that means reducing the framerate for blue (eg: 30fps for red and green, 15fps for blue), but with Jupiter still fairly low and nowhere near as bright as it will get, at 30fps the histogram was only half full in green channel.

I captured for 40s each colour channel, giving me 600 frames in total. I stacked about 170 from each colour channel. It takes about 10 seconds between colour channels to change filter, change settings and double-check focus.

So there is some rotation between the first frame of the red channel, and the last frame of the blue channel - no doubt about it. But within each channel (40s) there is no rotation. What that means is that you need to align on the features within the planet when recombining into RGB, rather than aligning on the limb. You'll get a slight (1-3 pixels) red edge on one side and blue edge on the other side.

Hope that helps.

[Alchemy]

Thanks for your reply, i know you often post early morning so ive been watching to see your answer (methinks you slept in this morning)

the items you posted are of a great help, i will copy and paste to a sheet, and add other bits as nessecary so i can have a quick referencefor my first few tries.

thanks

[Alchemy]

just rereviewed your reply, did you use a luminence channel ? or is this more restricted to deep sky viewing.

[iceman]

Oh sorry forgot to answer that bit - I didn't use Luminance, just RGB. For planetary, most times the Luminance channel is blurrier than the others - the spread of wavelengths just doesn't give a sharp image.

I've only been successful using it on Jupiter once or twice last year.

I didn't sleep in, but I had to catch a later train.. was outside imaging Jupiter this morning in good seeing! results later ;)