Saturn, trying to see more than just 2 belts.
Posted 16 March 2009 - 05:47 PM
seeing more than just the two equatorial belts smeared out has always been a challenge for me, and i wanted to grab the opportunity of the closed rings and steady seeing to try to see more.
in short: i failed. i didn't see more belts. but staring at them showed some subtle details i think i missed out on last time(s).
it's very difficult to reproduce the fine differences in shades, so a little explanation will be handy as the sketch fails to show you what i saw.
(south is up in the sketch, i believe)
- overall, the southern hemisphere was noticeably darkest, and the one belt i could discern there was smaller than the one in the northern hemisphere, but darker.
- whereas the north belt has a more smeared-out appearance at both edges, i think the south one has a distinct sharp edge towards the equator, gradually fading out towards the pole.
- the south pole region has abouth the same darkness than the south belt, and it too seems to fade gradually into that belt.
- the regions around the ring are brightest. about the same to each side.
-then very gradually a broad belt begins to darken which fades again when it starts to reach the north polar region.
- it may have been my eyes playing tricks on me, but the north polar region actually looked very bright, about the same as the region around the ring.
16/03/09 around 22:30 local time
8" dob @ 250x using 4mm UO Ortho
orange, green and blue filters used. orange didn't help, blue not very handy either, green provided better contrast. i will try this again next time.
the two moons at left are Iapetus (left) and Dione (right). not included in the sketch, but visible were Titan and Rhea.
Posted 16 March 2009 - 08:25 PM
Posted 16 March 2009 - 10:24 PM
I felt you did a really delightful job in capturing Saturn. I enjoyed your opening of the rings and the detail you provided.
Posted 16 March 2009 - 11:44 PM
Beautiful Saturn with moons sketch. I also enjoyed reading your observing narrative.
Posted 16 March 2009 - 11:48 PM
Posted 17 March 2009 - 01:57 PM
An excellent observation and report on Saturn. You have recorded the globe and rings very nicely. Thank you for sharing it with us all.
Posted 18 March 2009 - 07:45 AM
Lovely sketch. You might look for a dual nature to the northern belt next time out -- I see the top and bottom of it as very slightly darker than the center.
I also see some lumpiness in the southern belt, but I'm not sure if that's real or not.
Posted 18 March 2009 - 01:08 PM
next time, i'll try to see some structure in the northern belt using a little less power!
Posted 18 March 2009 - 01:59 PM
Posted 18 March 2009 - 03:05 PM
i don't know this makes sense, but i've noticed the effect too anyway
a bit like 'resetting' your eyes?