HH 212
 Image of HH 212 using NIRCAM | |
| Object type | Herbig-Haro |
|---|---|
| Other designations | MHO 499, HH 212 |
Observation data (Epoch J2000) | |
| Constellation | Orion |
| 5 43 50.64 | |
| Declination | -1° 3' 11.46" |
| Distance | 423±15[1] pc |
| Estimated age | 7000 yr |
Notable features | Symmetrical jets |
HH 212 is a Herbig–Haro object (HH) located roughly 423[1] parsecs from Earth in the constellation of Orion,[2] not far from the Flame Nebula[3]. The protostar, which is embedded deep into the center of HH 212 is very young. The high velocities of the symmetrical protostellar jets suggest that the outflows are around 7,000[3] years old. The high velocity of these jets also create observable bowshocks[4][3] that trace the path of the outflow jets.
Jets
[edit]The protostar IRAS 05413–0104 is emitting large bipolar jets traveling at velocities averaging 170[3] kilometers per second. These jets show a remarkably symmetric appearance. There appear to be several symmetrical knots appearing on either side of the jet at relatively stable intervals, (roughly 0.01 parsecs) suggesting that it varies regularly over a short timescale of just 30 years.[4][5] The fast speeds of the jet rams into the interstellar medium creating two main bowshocks. They are located north and south of the jets symmetrically.
References
[edit]- 1 2 Kounkel, Marina; Hartmann, Lee; Loinard, Laurent; Ortiz-León, Gisela N.; Mioduszewski, Amy J.; Rodríguez, Luis F.; Dzib, Sergio A.; Torres, Rosa M.; Pech, Gerardo; Galli, Phillip A. B.; Rivera, Juana L.; Boden, Andrew F.; Evans, Neal J., II; Briceño, Cesar; Tobin, John J. (2017). "The Gould's Belt Distances Survey (GOBELINS) II. Distances and Structure toward the Orion Molecular Clouds". The Astrophysical Journal. 834 (2): 142. arXiv:1609.04041. Bibcode:2017ApJ...834..142K. doi:10.3847/1538-4357/834/2/142.
- ↑ "Herbig-Haro 212 (VLT)". Webb. Retrieved 2025-08-07.
- 1 2 3 4 Reipurth, Bo; Davis, C. J.; Bally, John; Raga, A. C.; Bowler, B. P.; Geballe, T. R.; Aspin, Colin; Chiang, Hsin-Fang (2019-08-12). "The Giant Herbig–Haro Flow HH 212 and Associated Star Formation". The Astronomical Journal. 158 (3): 107. arXiv:1911.05877. Bibcode:2019AJ....158..107R. doi:10.3847/1538-3881/ab2d25. ISSN 1538-3881.
- 1 2 information@eso.org. "Outbursts from a newborn star". www.eso.org. Retrieved 2025-08-07.
- ↑ Zinnecker, H.; McCaughrean, M. J.; Rayner, J. (1996). HH 212: The Most Beautiful Protostellar Jet Known to Date. Lecture Notes in Physics. Vol. 465. pp. 236–245. Bibcode:1996LNP...465..236Z. doi:10.1007/BFb0102641. ISBN 978-3-540-61389-3. ISSN 0075-8450.
{{cite book}}:|journal=ignored (help)