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Old 13-03-2018, 06:07 AM
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andyc (Andy)
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Jupiter (Ganymede & Io in transit), Mars, Saturn in good seeing, 11th March

Some nice results from a session at the weekend. Good seeing for the double transit of Ganymede & Io, and although I was a bit disappointed with my G & B channels, the R was very crisp. And satisfyingly sharp Mars with clouds on Elysium Mons, and my first Saturn of the season has the polar vortex & hexagon in IR.

Jupiter gallery
Mars gallery
Saturn gallery
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Old 13-03-2018, 07:59 AM
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Tinderboxsky (Steve)
I can see clearly now ...

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Very, very good Andy. Ideal seeing makes such a difference. Looking forward to the three Oppositions.
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Old 13-03-2018, 08:50 AM
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h0ughy (David)
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Talk about triple treat, fantastic results
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Old 13-03-2018, 11:58 AM
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Nice set there Andy, well done
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Old 13-03-2018, 08:47 PM
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Ah very nice, indeed !

I watched the transit of Ganymede's shadow for a while but hit the sack by the time you took those.

You're really tempting me to hook up a camera to my scope as it seems I have a fair chance of good seeing at the local park...
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Old 13-03-2018, 09:24 PM
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blinky (Leigh)
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Great images! Nice definition on the moons and with the rings of saturn. How high was saturn when you imaged it?
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Old 15-03-2018, 11:25 AM
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andyc (Andy)
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Thanks everyone!

Leigh, Saturn was about 57deg up, imaging close to 6am in Sydney. High enough I'm not considering the ADC for it.
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Old 16-03-2018, 12:19 PM
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ADC? I thought you don't need one when doing RGB because your only getting light from one color at a time?.
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Old 16-03-2018, 02:29 PM
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Good images and the moons look great.
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Old 16-03-2018, 04:55 PM
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andyc (Andy)
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Quote:
Originally Posted by blinky View Post
ADC? I thought you don't need one when doing RGB because your only getting light from one color at a time?.
Because the spectral bands of your R, G & B filters are not narrow, dispersion still operates on the ~100nm band of each mono filter. As dispersion affects blue more than red, if the blue channel is particularly bad and the planet is < ~60deg high, it may well be worth it. This article gives a lot of good info and data, with an example of the effect on mono imaging of Jupiter. For blue, the effect is 1" at 40deg, quite a bit larger than the resolution of either of our scopes. Another good chart is here and some miscellaneous discussion here. My take-away from it is that I'll probably not bother very much, especially this season when the planets are very high, but it's worth keeping in mind to try.
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Old 17-03-2018, 01:32 PM
bigjoe (JOSEPH)
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Thanks for sharing these Andy ..have seen clouds visually over Elysium in a 7" mak.at 600X, and sighted an albedo feature as an apparition, where Olympus Mons should be...last Mars opposition..

Cheers bigjoe.
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