> From ericng@cuhk.edu.hk Wed Oct 22 22:38 MDT 2003
Subject: 20031021 Jupiter - I am really confused ...
Date: Thu, 23 Oct 2003 12:37:21 +0800


Dear friends,

I have just processed the Juptier image captured in this morning after 
read the message by Frank concerning about the dark spot feature.  Sorry 
that the exact UT time is not avaliable now as I forgot to get back my 
observing log book. The should be around 22:10UT.

I checked the SKY software and there was double transit occurred at that 
time. According to the software, the bright spot at the preceding side 
was Io and the Ganymede should be near central meridian above NEB ... 
However, I could not differentiate whether the "dark spot" near the CM 
on my image was Ganymede itself or the dark feature in NEB mentioned by 
Frank. I am really confused ... The dark condensation on STemp region at 
following side could be seen on this image too.

http://www.ort.cuhk.edu.hk/ericng/jup-2003102222xxUT-eric.jpg

May the expereinced observers and experts kindly commented on it?

Seeing was really bad as transparency was low as usual and the cloud 
formed on eastern sky near sunrise this morning, I could only capture it
through the cloud gap ...

Thanks for your help

Eric Ng
P.S. I shall post the exact time to here once I check my log book.