The debris from SW3 will strike Earth’s atmosphere slower than other meteor showers and it’s the velocity at which the debris strikes rather than the size of the debris that causes the shower.
Even if visible, this means the meteors would be much fainter, for example, than the eta Aquariids meteors earlier this month.
“This is going to be an all or nothing event. If the debris from SW3 was traveling more than 220 miles per hour when it separated from the comet, we might see a nice meteor shower. If the debris had slower ejection speeds, then nothing will make it to Earth and there will be no meteors from this comet,” Bill Cooke, who leads NASA’s Meteoroid Environment Office at NASA’s Marshall Space Flight Center in Huntsville, Alabama, said in a statement.