* Astronomy

D/1770 L1, popularly known as Lexell's Comet after its orbit computer Anders Johan Lexell, was a comet discovered by astronomer Charles Messier in June 1770.  It is notable for having passed closer to the Earth than any other comet in recorded history, approaching to a distance of only 0.015 astronomical units (2,200,000 kilometres) on 1st July.
The comet has not been seen since 1770 and is currently considered a lost comet.
Read more

See also Asteroid 2010 JL33