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Comet ISON brightens to just within naked eye visibility.
“[T]he little but intensely condensed, globular cluster-looking comet was a whopping magnitude 5.4 — two full magnitudes brighter than just 24 hours ago! This makes for a three magnitude total rise since my observation on Monday.” In just 72 hours, Comet ISON increased nearly 16 times in brightness.
Don’t get too excited. Magnitude 5.4 would make it comparable to one of the dimmer stars in the night sky, while the description above indicates it looks less like a comet and more like a blob.