HH 222
HH 222,, is a prominent Herbig–Haro object located in the Orion molecular cloud complex. It is characterized by its elongated, cascade-like structure resembling a flowing waterfall, formed by ionized gas streams interacting with surrounding molecular clouds.
Structure
HH 222 is a giant, curved filament of shocked gas, stretching in a sinuous path that evokes the appearance of cascading water. The structure converges toward a bright, non-thermal radio source in its upper left region, with fainter parallel streams enhancing the waterfall illusion. Spectroscopic analysis reveals high-velocity outflows, indicative of shock fronts where material reaches speeds of hundreds of km/s.The nebula is embedded in a dusty environment, with the surrounding L1641 cloud obscuring parts of its extent in optical wavelengths. Infrared and radio observations have been crucial for mapping its full morphology and kinematics.