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C/2019 Q4 must be huge compared to the previous interstellar object to be spotted 3 AU out. Size estimates range from 2-16km, compared to 'Oumuamua's <1km size.
That's nothing. Comet Hale-Bopp (C/1995 O1) had a size estimate of approx 60 km (±20 km). Comet Halley (1p Halley) is 15x8 km. C/1995 O1's distance when it was discovered was at 7.2 AU.
C/2019 Q4 must be huge compared to the previous interstellar object to be spotted 3 AU out. Size estimates range from 2-16km, compared to 'Oumuamua's <1km size.
