A frequent photoblog with select favorites of my photographs. Subjects are typically nature, landscape, astrophotos, existing light.
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Sunday, November 18, 2007
Comet 17P/Holmes is still putting on a good show. I mounted my camera on the front of our 36 inch Spacewatch Telescope again last night and took this image of the comet. The camera was in a spot I had lots of trouble getting to, so I had a devil of a time centering and checking focus, but I managed to get the focus right. I had to crop this image so that it appears more like an image with about a 500mm focal length since the comet ended up in the lower corner of my frame. Did I mention that the camera was mounted in a spot that I had trouble getting to? Oh, yeah, I did..... Anyway, the comet sits right next to the brightest star in Perseus - Alpha Perseus (Mirfak) which is to the upper left of the comet in this image. The comets nucleus is visible to the bottom right of the almost but not quite circular coma. To the upper left of the nucleus is a complex dust structure that is slowly blowing away from the comet, pushed by solar wind and if the image were deep enough, we would see a complex tail structure of fine dust and gas extending off the frame to the upper left. This image was taken at 190mm focal length with an exposure of 60 seconds at f/6.3, ISO 400.