Comet
Hyakutake
TypeComet
Mass~1 × 10¹³ kg
Diameter4.2 km
Known Moons0
Surface Gravity~0.0001 m/s²
Average Temp-70 °C
AtmosphereH2O, CO (coma)
Discovered ByYuji Hyakutake
Discovery Year1996
About Hyakutake
Surprise visitor of 1996, discovered with binoculars six weeks before passing 15 million km from Earth. Its tail grew to 570 million km, the longest on record. First comet seen to emit X-rays.
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