The comet is dimmer but I'm still impressed by it. This is my only good shot from last night. I wish I could have done the view justice but I've discovered that as a photographer, I make a much better software developer
Geez Terry! That is so 'Australian'!!!!!
Put it on a post card or a promotion for Oz!
Fantastic mate
More nice images lads! The fence one is a keeper. Nice composition - and I say that as a photographer. Worth crawling around with the snakes!
It just occurred to me - I wonder if the "split" tail look that is so prevelent in many images, especially the ones of the nucleus, is actually caused by the shadow of the inner (and denser) coma falling on the tail?
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It just occurred to me - I wonder if the "split" tail look that is so prevelent in many images, especially the ones of the nucleus, is actually caused by the shadow of the inner (and denser) coma falling on the tail?
Rob McNaught and I looked at this on my image of 18th Jan and some other images, it is definitely not a shadow, because it is curved! At the time the angle subtended by the sun from the comet was about 3 degrees, meaning that any shadow's cone would only be about 20 times as long as the diameter of the nucleus (plus dense nearby coma). The dark line clearly extends much further than this. I think we are just looking through an expanding cone of material and it appears darker where we see the least amount of dust (therefore least reflected sunlight).
If you click on the "Go Advanced" link at the bottom of the thread and then select "Manage Attachements" halfway down the page. Jpeg uploads are limited to 150Kb.
Just use an image resizing program like "irfanview" and save them under 150k jpeg. Make sure you resize them to around 800px wide to keep the filesize down without compressing too much.
Gordon, nice to see you on IIS! Your images are amazing!
Hi all, it seems as if Melbourne is going to be clouded out again for a couple of days. I have put, side by side, a images that i have taken over 4 days. The exposure settings are different, so different the amount of tail visible isn't an indication of the fading of the comet, but you can still see the angle changing.
No fancy gear with me - static tripod only and the 20D. Comet visable one night only (21/1) - but with the crescent moon and venus it was a great sight over Mt Dromadary at Narooma...more to come... have only processed the close up so far....
Last edited by JohnH; 31-01-2007 at 03:14 PM.
Reason: Added new image....
...Gordon, nice to see you on IIS! Your images are amazing!
Are they all taken while tracking?
Thanks and yes all tracked, but not guided. (Edit: apart from the untracked 15 sec morning photo, camera on mount but motor not running.)
Quote:
Originally Posted by dcnicholls
Also, what sort of tracking mount do you use?
DN
The images from the 18th and 19th are taken from home, using my home made 25cm Newtonian for tracking (theres a pic of that on my home page). Then work interfered and I had to bring my portable but quite old Polaris style mount, and have used that at SSO and from near Dubbo.
![[1ponders]'s Avatar](../vbiis/customavatars/avatar45_9.gif){kind=avatar}
Laserphil.
Fantastic. But now Robs name will be spoken among the great: 'Halley', 'West' etc. 
and yes all tracked, but not guided. (Edit: apart from the untracked 15 sec morning photo, camera on mount but motor not running.) 
