"Normal" people worry me! - If you want to think "outside the square" you really need to get out of your box! A kleptomaniacal plethora of gear: Custom-cooled (my designs) C11&14, Orion Optics (UK) VX16 16" F4 newt waiting for obs, ED127 triplet, NEQ6Pro, HEQ5Pro, ancient AstroOptics EQ mount super-customised with microsteppers, goto etc, ASI120MM, ASI120MC, Flea3 (retired - accepting offers!) Toucam 840k, modded Canon 50d + F4L etc,etc & lots of other homebrew equipment.....
Skywatcher Auto Flextube 250 Dobsonian, DFK 21AU618.AS QHY5L-ll mono & colour http://www.flickr.com/photos/42079393@N05/
Quote:ZuoZhao what was the UT time of capturing ?
Quote:Congratulations ZZ - it looks like you've captured the dark spot and confirmed imo if your time shown is Beijing time (UT +8 hours) because then your coordinates would be very similar to those in my images 3 days earlier here: http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5940555/page...I won't rehash earlier comments except to note that your "enthusiastic" processing does create a somewhat unusual appearance for this long-lived dark spot.....I appreciate that you've said you don't understand Saturn etc coordinates but you really should think about working out some of the simple means of plotting/confirming details. All you need is the "ephemerides" section in "Tools" of WinJupos which you must have already for your derotations and a simple explanation of how the coordinates are used: CM3 has taken over mostly but a simple explanation of all 3 "Systems" can be found here on the left hand side of the 2nd page... http://britastro.org/journal/pdf/122-3abel.pdf