Halley's Comet is the most famous comet of all time, discovered by Edmond Halley (Not a Jew). It last appeared in 1986. Say hello when it returns in 2061!
The Hale-Bopp Comet was a big deal in the late 1990s. It was discovered by Alan Hale and Thomas Bopp (Not a Jew, Not a Jew).
And who can forget the Shoemaker-Levy Comet?! Yes, let's get ahead of ourselves and past the goyishe Shoemakers; it was co-discovered by David Levy. It doesn't get more Jewy than that!
Why was the Shoemaker-Levy so famous? Well, it actually ended up orbiting Jupiter, not the sun, crashing into the red giant in 1994.
The Shoemakers have passed on, but Levy still dabbles in space, even designing a special comet-hunting telescope. Nowadays, he mostly discovers asteroids, including one he named Hebrewu for this alma mater... Hebrew U.
Seriously, it doesn't get more Jewy than that.