Gavin James
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Astronomy Solar System     << previous  
Comet 21P/Giacobini-Zinner - 2018-09-05 - Composite Image

I shot 45 images of Comet 21P to make a time lapse, but I thought it would also be interesting to make a composite of the first frame and a frame taken exactly one hour later. The idea being that with a bit of pixel measurement and mathematics, the comet's speed could be calculated. It works out that Comet 21P was travelling at about 22 km/s across our field of view - impressive!



Thomas Cooke 10" refractor
Canon EOS 1Dx
2 x 16s at ISO 6400


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