04-11-2007 17P

Bug

Bug & Eric & Bill
300 f2.8 + DFK21AF04
392x10sec

PTS

Bill, Eric & Bug,
How long was your photo session?  Did you notice rotation of the inner coma?

PTS

ps My notebook is still at Hokoon, left there to continue capturing at 1 frame/10 sec.
I'll check the result this evening.

ericng

The frames were grabbed continously so 10 sec x 392 which is 3920 sec (Approximately 1 hour 5 mins.)

The pixel scale of our images is approx. 3"pixels with 300mm lens and DFK camera (5.6um pixel), I beleive it is not enough to show such tiny rotating effect within an hour.

How many frames did you captured with the Ho Koon scope. I Your image sampling is almost 10 times of ours so should be able to provide better spatial resolution of the image.  

Best Regards,

Eric

PTS

Eric,
We started at about 11:15 pm, and I left at about 12:45, leaving Cheung Sze leung and kenneth Hui to take care of the ccd, etc. (We have a Physics Nobel laureate from France visiting my department for 2 weeks, so I dared not stay too late)
I have been too busy today, and have not yet contacted them.  I'll go to Hokoon tomorrow evening and then I can check.
if they go all the way to 4 or 5 am, there should be about 2000 frames and I may see some rotation, even if only slightly.
Why I ask this question is I saw a posting with images from several days placed side to side.  Assuming they put the correct orientation for all the images, I noticed a gradual rotation of the asymmetrical inner coma.

PTS

Bug

見到尾的17P
300mm f2.8 lens + canon 350D & 300mm f2.8 lens + DFK21AF04
350D: 30x30sec, bin 3x3

[ 本帖最後由 Bug 於 2007-11-5 21:43 編輯 ]

BillYeung

Hi Bug, Eric and all,

This is a perfect proof of Bug's processing skill and Shui Hau site's potential :-)

Bill

[ 本帖最後由 BillYeung 於 2007-11-5 22:30 編輯 ]