HH 111
HH 111 is a Herbig-Haro object in the L1617 dark cloud of the Orion B molecular cloud in the constellation of Orion. It is a prototype of a highly collimated optical jet sources. It shows several bow shocks and has a length of about 2.6 light-years (0.8 parsec).

HH 111 is about 1300 light years (400 parsec) distant from earth and the central source is IRAS 05491+0247, also called VLA 1. This source is the driving source of the jets and it is a class I protostar with a luminosity of about 25 . This protostar is embedded in a 30 cloud core. The dynamical age of the complex is only 800 years. Near the central source an ammonia feature called NH3-S was found, which is a starless core with a turbulent interior induced by HH 111.

The jets move with a speed of 300 - 600 km/s and consist of a blueshifted component, which is bright in optical wavelengths and a redshifted faint counterjet. A second pair of bipolar jets, called HH 121 was discovered in the near-infrared at an angle of 61° compared to the HH 111 pair. This was taken as evidence for a system with multiple protostars.
Q50048
Herbig-Haro object
Concept
None
L1617
UNK
Q16742
Orion B molecular cloud
CEL
Q8860
Orion
Concept
Q1571347
collimated
Concept
Q284657
jet
Concept
Q48930
bow shock
UNK
Q531
light-year
Concept
Q12129
parsec
Concept
None
IRAS 05491+0247
UNK
Q204903
protostar
Concept
Q4087
ammonia
Concept
Q182429
km/s
Concept
Q845345
blueshift
Concept
Q76250
redshift
Concept
Q11388
near-infrared
Concept
Q28390
°
Concept
Q595871
multiple protostars
Concept
Q87061300
HH 111
UNK
Q87061300
HH 111
UNK
Q87061300
HH 111
UNK
Q87061300
HH 111
UNK
1300-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1300
DATE
+1617^^http://www.w3.org/2001/XMLSchema#decimal
1617
NUMBER
+2.6^^http://www.w3.org/2001/XMLSchema#decimal
2.6
NUMBER
+0.8^^http://www.w3.org/2001/XMLSchema#decimal
0.8
NUMBER
+400^^http://www.w3.org/2001/XMLSchema#decimal
400
NUMBER
++0247^^http://www.w3.org/2001/XMLSchema#decimal
+0247
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+25^^http://www.w3.org/2001/XMLSchema#decimal
25
NUMBER
+30^^http://www.w3.org/2001/XMLSchema#decimal
30
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+61^^http://www.w3.org/2001/XMLSchema#decimal
61
NUMBER
named after