Interstellar Comet 2I Borisov
in the Milky Way galaxy,
was just visiting the Solar System.
Discovered by amateur astronomer Gennady Borisov
on August 30, 2019, the first known interstellar comet
is seen in these two
Space Telescope images
from November and December 2019.
On the left, a distant background galaxy near the line-of-sight to
Borisov is blurred as
tracked the speeding comet and dust tail about
327 million kilometers from Earth.
At right, 2I/Borisov appears shortly after perihelion, its closest
approach to Sun.
European Southern Observatory
that this comet may never have passed close
to any star before its 2019 perihelion passage.
approach to our fair planet, a distance of about 290 million
kilometers, came on December 28, 2019.
Even though Hubble's sharp images don't resolve the comet's nucleus,
they did lead to estimates of less than 1 kilometer for its diameter.
Authors & editors:
NASA Web Site Statements, Warnings,
NASA Official: Jay Norris.
A service of:
& Michigan Tech. U.
Publications with keywords: comet
Publications with words: comet