Astroblog: Theta Carina

Friday, February 10, 2006

Theta Carina

This is the "Southern Pleiades" imaged with my little olympus muj:300 digiatl caera. The image (which you have to click on to see anything other than the two bright stars) is a stack of 6 images using The Gimp, with individual dark frame subtraction. It worked pretty well, for some reason some hot pixels made it through (maybe I did'nt use differnce properly in the Gimp), but I'm happy with the image. Here is the full image it was cropped from (warning half-meg file), it's not bad, but there is something unusual about it, any explanations?

# posted by Ian Musgrave @ 7:29 am

Comments:

Ian, I'm using a 'burnt in' internet cafe monitor with very poor contrast, so I can't tell what the unusual thing is?

# posted by

Anonymous : 3:10 pm

Well, it might be easier if you increase the size of the picture, but I centerd the overlays on Theta Carina, as you go progressively further away from Theta, the stars from a curved path (easily distinguished from the hot pixels, which form a straight line). Of course, the sky rotates in a curved path, so a long enough sequence of shots will capture that rotation. Time to make a Barn Door (or Scotch) mount.

# posted by