Related Clues:

• Hale-Bopp, for one
• Bad omen, perhaps
• Stellar sight
• Telescope sight
• Minor planet
• Kohoutek, for one
• Space sighting
• Ceres or Eros, e.g.
• Space traveler
• Celestial object with a tail
• Cupid's friend
• HALLEY'S, FOR ONE
• Celestial firework
• Cleanser or a reindeer
• Icarus, e.g.