What is the name of the comet that Pierre sees in War and Peace?

The comet Pierre sees in War and Peace is the Great Comet. Tolstoy presents it as an enormous, brilliant object whose appearance seems to promise catastrophe, including war and the end of the world.

The real astronomical object was the Great Comet of 1811, formally designated C/1811 F1. French astronomer Honoré Flaugergues discovered it on March 25, 1811, and it became especially bright in October. It remained visible to the naked eye for roughly 260 days and developed a striking tail.

The comet's appearance was widely treated as an omen. Many Europeans associated it with Napoleon's invasion of Russia in 1812, which gives Pierre's observation an important symbolic role: the sky seems to reflect the historical crisis unfolding on Earth. It is not Hale-Bopp or Halley's Comet; those are different comets observed in different periods. Hale-Bopp appeared in 1997, while Halley's Comet last became prominent in 1986.