Sundog, Friday 23 June

[hevelsky]

Hi all,
Here an image of a sundog take at 18h30 UT, Friday 23 June
with my canon eos300d (100ISO, 1/4000s.)

http://perso.orange.fr/astro-sug44/i...2006_small.jpg

[[1ponders] (Paul)]

Nice shot Guillaume. Good thing you had your camera with you.

[h0ughy (David)]

Nice one!

[hevelsky]

Thanks Paul and Houghy for your comments

[iceman (Mike)]

Great job, I like the way you processed it to bring out the sundog even better.

I need to start taking note of looking for these.. and carrying my camera with me more often!

[matt]

Er ... excuse my ignorance .... but what's a sundog?

[ving (David)]

Originally Posted by iceman

.. and carrying my camera with me more often!

and we were under the impression that you practically slept with your eos!

great sun dog piture

[[1ponders] (Paul)]

Here ya go Matt.
http://www.astrophys-assist.com/wilo...win/sundog.htm
http://www.sundog.clara.co.uk/halo/parhelia.htm
http://en.wikipedia.org/wiki/Sundog

[fringe_dweller]

nice catch Guillaume I'm partial to sundogs myself, have you seen many doubles? there a little bit rare for most of australia (particularly the north) really a polar thing, i'm guessing from experience ppl in southern oz would only get to see about 10 displays a year on average (and some can be over very quickly)

[matt]

Thanks Paul.

Interesting stuff

[hevelsky]

Thanks for all your comments
fringe_dweller --> yes I saw once double sundogs, it was last year but I did not have my camera with me this day

[firstlight (Tony)]

Originally Posted by fringe_dweller

nice catch Guillaume I'm partial to sundogs myself, have you seen many doubles? there a little bit rare for most of australia (particularly the north) really a polar thing, i'm guessing from experience ppl in southern oz would only get to see about 10 displays a year on average (and some can be over very quickly)

Anne-Louise and I have seen a few double sundogs, but the coolest thing we have seen was a circum zenithal arc. Only saw one... never forget it.


Photos by Anne-Louise, no enhancement just stitched a few together. Would be very lucky to see as many as 10 per year, but I have seen one in December from Brisbane... cool.

Tony

[fringe_dweller]

Wow! thats a very nice image and arc! never seen a cza myself tho sadly.

I am guessing the 10 a yr, re parhelia figure tony, that is based on my very casual observations over several years, and I am talking hyperthetically, if you looked every single likelyday for them, and I dont look as much as I should or could, you could possibly see that many a year from here. I am basing this on averaging the times I see them and look for them (mostly march/april for here) X potential days for seeing them. I find lower passsing clouds are the biggest problem because they quite often occur at the same time as the sundog producing cirrus, and have blocked out many a partner of a pair, I know for sure.
Also I am basing my assumptions on frequency of these type of visual phenomena regarding latitudes, on the distribution of these images on the web and the locations they are most freguently taken from - and the best ones invariably come from latitudes over say 45º north and south - usually to do with the jet stream associated ice/cirrus I presumed?. In fact i have never seen an australian image of one from north sydney before, ever! So it seems not only do you get very nice ones, but you get arcs in the bargain! wild!

[fringe_dweller]

dang! forgot to mention the other factor why I thought the closer to the poles you get, more likelyhood of these phenomena, is, that in summer the sun spends more time sliding along in just the right angle of the dangle zone on the ecliptic for a longer duration of the day, than it would closer to the equator?

[[1ponders] (Paul)]

Great shot Anne-Louise. Thanks for posting it Tony. Have you tried stitching the images together with Autostitch. Fantastic program. Just open the images up as a batch, they don't need to be in order and let the program do its thing. One of, if not the, best freebee around.