The largest comet humans had yet seen, found by Enterprise in 2151 and named for its captain; Reed and Mayweather landed on it to drill for a rare mineral.
Archer's Comet is the comet at the centre of the Enterprise episode Breaking the Ice. Enterprise comes across it in 2151 and finds it is bigger than any comet recorded by humans.
Scans show a large deposit of eisilium, a mineral of scientific interest, within the nucleus. Reed and Mayweather take a shuttlepod down to set charges and collect core samples, and find time to build a snowman. Meanwhile the Vulcan ship Ti'Mur under Captain Vanik watches from close by, to Archer's annoyance.
The blasting changes the comet's rotation, the ice gives way and the shuttlepod is trapped in a crevasse. Archer has to swallow his pride and accept the Vulcans' offer to pull it free with their tractor beam.