A fragment of Comet Arthur has a mass of about 1.7 billion tons. Among the fifteen fragments in total, the mass of Arthur A belongs to the small one.
But the number 1.7 billion tons is its mass when it was near Jupiter's orbit. During the long-distance trip to the sun, due to the solar radiation and the irradiation of the solar reflector, it was erupting violently all the time. When it reached the vicinity of the sun, its mass had been reduced to less than 1.6 billion tons. A total of 100 million tons of material was ejected by it.
