Jupiter and Io

[MarkS]

Jupiter tonight using eyepiece projection on the Celestron C11 with the SPC900 webcam
400 frames at 0.2 sec stacked in Registax then deconvolution applied.

[Fay]

You never disappoint, Mark, really nice.

Fay

[Ian]

it is indeed, especially given Jupiter's altitude at the moment.

However, I'd say you've overcooked it a little on the deconvolution. Try applying a little less so that ringing disappears.

It's also good to see a moon in the same shot, you didn't cheat, by the look of it

[RobertM]

Nice one Mark, it's a difficult to catch any shots of Jupiter at the moment and even more difficult to process something from the blur - an awful lot of atmospheric disturbance can happen in 0.2s ! 

[Mike]

Nice one Mark. As Ian says it is overcooked andf looks like 3 out of register images of Jupiter on top of each other. But well done for getting the moon in the same shot (presuming you didn't cheat).

[MarkS]

Admittedly it is a bit overcooked - I was trying to extract as much detail as I could.

As for Io, there was no cheating!  I was pretty pleased to get it showing so well in the final image - before deconvolution it was just a faint blur.

[Ian]

go on, post a raw stack

[MarkS]

Sure!  I'll do it tonight (after OAS).

[Daniel]

Love the colour your showing on Io, is that 2 sets of exposures for moon and jaupiter or all in the same shot?

[MarkS]

Daniel, Io and Jupiter are in the same shot - it's not a composite image.

Ian, as promised, raw stacked image of 400 frames at 0.2sec is here:

[Ian]

it's certainly a bit murky. Could you stick up a link to the raw BMP? I've just had a play and I can show some fantastic jpg artifacts

[MarkS]

I'll post the 16bit tiff tomorrow then you can play with the full depth of data.

[MarkS]

The 16bit raw stack is here (1.8 Mbyte):

http://gallery.orpington-astronomy.org.uk/albums/userpics/10046/jup23jul400raw.tif

Good luck!

[Carole]

Daniel, Io and Jupiter are in the same shot - it's not a composite image.

I can't find Daniel in this image!!

[MarkS]

I had to deconvolve the Jupiter raw stack with a Gaussian having standard deviation of 10 pixels or 1.3 arcsec, since an arcsec is around 7.5 pixels in this image.

So, roughly speaking, a star at similar altitude (15deg) would have an FWHM of around 20 pixels  (2.6 arcsec).  Indeed, using the Io as a proxy for a star, the FWHM of Io is definitely round about 20 pixels.