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Steven Bellavia
Southold, NY
08:55 pm

Equipment Details:

Borg 90FL, Edmund 589nm (sodium) narrowband (10 nm) filter, ZWO ASI 294MM Pro

Post-processing Details:

20 x 60 seconds, aligned and stacked

Image Details:

A 24 million km long plume of gas is ejected from Mercury's thin atmosphere due to the sun, very much like a comet.
This is only visible using a narrowband filter that captures the bright yellow sodium light at 589nm.