Fig. 2
Dust tail of comet ISON around perihelion transit observed in Ly-α. These 12 slot images with a size of 200′′× 240′′ were taken with a cadence of 30 s between 17:56 and 18:01 UTC (top left to bottom right). The cross marks the predicted position of the nucleus. In the final image red dots indicate the trajectory in steps of 30 s.
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