What specific behavior of the asteroid 3200 Phaethon relates it to the potential explanation for the Wow! signal?

It exhibits comet-like activity, ejecting dust streams that release hydrogen gas

3200 Phaethon is cited as another plausible natural source because, despite not being a typical comet, it is classified as an active asteroid known to eject dust streams. This ejection mechanism would likely release hydrogen gas into space. If Phaethon was positioned correctly, this outgassing could generate the necessary hydrogen emission at 1420 MHz, thus creating a strong, narrowband signature that could mimic the mysterious extraterrestrial signal detected. Although its closest approach timing in 1977 did not perfectly align with the detection date, its known behavior provides a pathway for a natural mimic.