Quote:What a beautiful season this has been for Jupiter. I've never seen it like this!
150mm MCT f/13, 31% CO
"People say I'm in denial. I disagree."
Orion xx14g Dob CPC 1100 w/Skywatcher 80ED piggybacked Coronado PST TMB 92L refractor AT Voyager mount Nexstar 6/8 mount Denk Big Easy binoviewers Oodles of eyepieces and other optical gadgets Past scopes Meade 8" reflector and 8" SCT
Quote: a yellowish pearl.
Mark Oak Park Observatory (aka my backyard) Bortle 7 Orion 90mm AstroView; EQ-2; 1.25" 25mm, 10mm Plossl Celestron Eyepiece Kit; 1.25" Barlow x2, 32mm, 17mm, 13mm, 8mm, 6mm Plossl; filters UO Super Abbe Orthos; 1.25" 7.7mm, 16.8mm Meade 60mm StarFinder; modified alt/az video camera tripod (it works!); .965" 25mm, 12.5mm, 9mm, 4mm; Moon filter. Meade 60mm Jupiter; Antares .965" 25mm, 12.5mm 10mm Super Plossl Bushnell 7x35 binos Simmons 10x50 binos Beach Chair
Quote:This effect would probably be apparent whether Io was in transit or not...maybe...possibly...?
Quote:This is an engaging speculation. I really want to pursue it.Pete
I want to do more then just look.
Quote:In a 6", Io at 1.7" is just a bit smaller than the Airy disc diameter (1.82") but also nearly twice the diameter of the (series of) spurious disc(s) at Io's magnitude with the CO considered. The combined diffraction rings would sum into a slightly elongated first ring much like a brighter, very close double of equal magnitude (72 Pegasi at 0.5" arc, for example.) It might be that the dimmer poles contribute less to the diffraction ring observed.The idea Io simply "appeared" elongated, even though it is not, is perfectly sensible.