Astronomy:HH 222
| Nebula | |
|---|---|
| Herbig–Haro object | |
| File:250px European Southern Observatory image of HH 222 | |
| Observation data: J2000.0 epoch | |
| Right ascension | 05h 35m 41.00s[1] |
| Declination | −06° 22′ 60.0″[1] |
| Distance | 1,500[2] ly |
| Constellation | Orion |
| Designations | HH 222 |
HH 222, (also known as the Waterfall Nebula and Orion Streamers),[1] 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.[3][2][4][5]
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.[6][7][8]
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.[8]
Formation
HH 222 is classified as a giant Herbig–Haro flow, arising from collimated outflows ejected by young, low-mass stars during their protostellar phase. Detailed studies in 2013 identified its origin in the quadruple star system V380 Orionis, a multiple system of young stars approximately 0.3 parsecs from the nebula's head.[8]
References
- ↑ 1.0 1.1 1.2 "Simbad - Object view". https://simbad.cds.unistra.fr/mobile/object.html?object_name=HH%20222.
- ↑ 2.0 2.1 "HH-222 The Waterfall Nebula". https://waid-observatory.com/hh222-2015-01-24.html.
- ↑ "Gallery Johannes Schedler". http://panther-observatory.com/gallery/deepsky/doc/HH34_F3.htm.
- ↑ info@noirlab.edu. "NGC 1999/L1641N" (in en). https://www.noirlab.edu/public/images/noao-n1999lg/.
- ↑ "HH 222 The Waterfall Nebula" (in en). https://telescope.live/gallery/hh-222-waterfall-nebula.
- ↑ "APOD: 2011 October 24 - HH 222: The Waterfall Nebula". https://apod.nasa.gov/apod/ap111024.html.
- ↑ "HH 222: The Waterfall Nebula". https://www.astronet.ru/db/xware/msg/1254324.
- ↑ 8.0 8.1 8.2 Reipurth, Bo; Bally, John; Aspin, Colin; Connelley, M. S.; Geballe, T. R.; Kraus, Stefan; Appenzeller, Immo; Burgasser, Adam (2013-10-07). "Hh 222: A Giant Herbig-Haro Flow from the Quadruple System V380 Ori". The Astronomical Journal 146 (5): 118. doi:10.1088/0004-6256/146/5/118. ISSN 0004-6256. Bibcode: 2013AJ....146..118R.
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