Comets are solar system objects that travel in highly elliptical orbits. This comet, Comet 17P/Holmes was first discovered on November 6, 1892 by Edwin Holmes in London England. This comet has a period around the Sun of approximately 7 years. The image seen here was taken on the evening of November 6, 2007, almost exactly 115 years after its initial discovery. The image was captured with a Nikon D70 digital camera with a 240mm lens mounted piggy back on a Losmandy G11 mount. The image is a composite of two subexposures with a total exposure time of 123 seconds shot at f/6.3 at ISO 800.
This comet very suddenly brightened in the past week before this shot was taken while the comet was heading away from the Sun. See more information at the Astronomy Picture of the Day website.
Below is the comet at the fullsize of the original frame from the above image.
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