Solar & Planetary LtE Now for CMO/ISMO #63 (CMO #437)
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¤····Subject: SOLAR IMAGES 19-21-25-2015
Hi Guys , rather a lot of images but the file sizes are not too big. Sit back and have a full screen slide show.
You might like to read this web page http://astrogeo.oxfordjournals.org/content/45/4/4.14.full related to “sun2015Jul21_dbvt-Progress-ar2387”, which shows convection cells in the umbra and light bridge as described in the text.
The shocked looking prom is a composite of two prom images an one for the surface. The extensions were very faint, but a lot of the best ones are.
Both AR 2389 and 2390 appear to be made up totally of solar pores, i.e. spots with no penumbra. I see 2390 went on to grow penumbra, whereas 2389 currently seems to be fading away.
Dave TYLER (Bucks, the
Ham call G4PIE
¤····Subject: Saturn, July 25
Hi all, some
reasonable seeing last night for a while on Saturn, I think all the interesting
stuff is on the other hemisphere...
Anthony WESLEY (
¤····Subject: Uranus & satellites 2015.07.2015
I finish this rather rich astronomy week for me (3 observations sessions from the middle of the night to dawn ,with each time good seeing), with my first Uranus this year, made with the new cam. Got lucky on that one, I spent more than half an hour trying to aim the scope to Uranus - not easy when the sky does not let you see stars fainter than mag 4/4.5 and when you have a Dobson and Telrad without any coordinate circles. I could do a single 15min run, with the same focal length as the one I use for Saturn (!), and only 120ms exposures ....
Despite the clear sky before sunrise, I think the result is really good, we can see clearly a white band near the North pole. This sensor allows me really to make significant progress in planetary faint light infrared imaging (CH4, Uranus, Neptune).
Marc DELCROIX (