Comet C/2010 X1 (Elenin)
is a long-period comet discovered by Russian amateur
astronomer Leonid Elenin on December 10, 2010, through
remote control of the International Scientific Optical
Network's robotic observatory
near Mayhill, New
At the time of
discovery, the comet had an apparent magnitude of 19.5,
making it about 150,000 times fainter than can be seen
with the naked eye.
Leonid Elenin, estimates that the
is 3-4 km in diameter.