Had a great session last night -- the first night in nearly two weeks! My prediction that I'd get about half of the nights was very far off. Sofar, since my Jupiter work started on 12 Feb 2014, I've had 14 observing sessions. So that means that my "observing efficiency" is at 17.5% (14 / 80).
The surprise this evening was the seeing. Towards the end of the session, I turned the scope to Saturn to start collecting 300 images of prelim data (I'm still assessing whether I can get "good enough" signal to noise to make the effort worthwhile) when just a little breeze blew through. The breeze was enough to notice but it was brief and, I thought, uneventful.
However, this little breeze brought with it some nasty air! The seeing went from really good to really bad in a matter of a couple minutes. Check these images out of Saturn:
|Figure 1: Saturn in good seeing and in bad seeing, minutes apart|
Having high-resolution astronomical imaging in my background, I'm curious about these things and would like to understand them better. I don't recall ever witnessing the seeing deteriorate so quickly. I'd like to know what exactly causes this and how long it lasts.
I can't make a post to this blog without a nice picture of the Jupiter system from last night:
|Figure 2: The Jupiter system 03:09 UTC 03 May 2014|
Also some nice Jupiter moon events for May:
5/8 E eclipse R 04:06I eclipse R 05:52
5/11 I/E close 04:00
5/17 I/G/C close 04:00
5/18 I/E/C close 05:00
5/24 G eclipse R 03:31
I eclipse R 04:10
05/26 C eclipse D 04:39