Wirtanen makes a very close (for a comet) approach to the Earth:

• Occurs Dec 16, 2018
• Less than 4 days after perihelion
• The comet is near its brightest
• Geocentric Distance: 0.0775 AU / 30 Lunar distances / 11.5 million km
• 10th closest comet in modern times (Few of the others reached naked eye brightness)
• No chance of the comet hitting Earth