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Matthew Knight's blog

What is going on with Siding Spring’s lightcurve?

As can be seen on the Current Status page, C/2013 A1 Siding Spring’s reported brightness declined considerably more than expected over the last week or so. We chose not to speculate about what might be causing the decline on that page, but I’m going to take advantage of the freedom provided by a blog post to expand on what I think might be going on.

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