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Jupiter + couple of moons spectra!


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HI guys

After a long break getting some new gear and changing the obs pc to Linux managed a few shots of Jupiter, Ganymead and Europa last night.

Not had chance to do any in depth processing or calibrating yet as it was just to see if stuff is working how it should but was surprised to see emission lines on both moons spectra but an absorption line the same place on the Jupiter one?? Should all be similar shining with the same sunlight I would have thought? Most probs some discrepancy in my processing more like ;-) Will try and calibrate them later to see the wavelength.

post-15973-0-23629200-1422390493_thumb.p

cheers

Steve

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Hi Steve,

Welcome back to spectro!

I am not aware of any reason why you would get that peak in the moons. Perhaps you have made a discovery. :icon_bounce:

The main spectral features, like telluric and balmer lines line up (using the Alpy?).  Would take a better guess if I could look at the FITS images, say for hot/cosmetic pixels

NB I think Jupiter is possibly a little saturated, judging by the shape of the continuum.

cheers

John

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Hi John

Yes you are right about the Jupiter one ! I had quite a bit going on at the time, trying to get me head around many different Linux apps and the Ekos/Indi Linux stuff can be a little buggy too.No excuses though, should be back with it once I get the hang of it all :evil:  Quite a different learning curve using Linux.

best

Steve

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Hi Steve,

The most intense emission line looks to be approximately at the sodium doublet wavelength and it is possible to detect sodium emission from Io and the surrounding regions eg

http://www.astrosurf.com/buil/io_sodium/obs.htm

http://www.astrosurf.com/buil/forum/poster_io.png

http://www.cloudynights.com/topic/481832-spectroscopy-of-sodium-cloud-surrounding-satellite-io/

In this case though I think I would first check that the sky background subtraction has worked ok and that it is not light pollution contamination 

Cheers

Robin

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