Sh 2-276
E558699
Sh 2-276 is a large, faint emission nebula in the constellation Orion, commonly known as Barnard's Loop, forming part of the Orion molecular cloud complex.
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
emission nebula ⓘ interstellar nebula ⓘ |
| alsoKnownAs |
Barnard's Loop
NERFINISHED
ⓘ
Sharpless 2-276 NERFINISHED ⓘ |
| angularPositionRelativeTo | surrounds Orion Nebula region ⓘ |
| apparentSize | about 10 degrees across ⓘ |
| associatedWith |
Orion OB1 association
NERFINISHED
ⓘ
massive star formation in Orion ⓘ |
| bestSeenFrom | dark-sky sites with wide-field imaging ⓘ |
| catalog |
Barnard dark and bright nebulae lists (as Barnard's Loop)
ⓘ
Sharpless catalog of H II regions NERFINISHED ⓘ |
| contains |
filamentary emission structures
ⓘ
regions of enhanced H-alpha brightness ⓘ |
| discoveredBy | Edward Emerson Barnard NERFINISHED ⓘ |
| distanceFromEarth |
about 1600 light-years
ⓘ
about 500 parsecs ⓘ |
| dominantEmissionLine | H-alpha ⓘ |
| emissionMechanism | recombination radiation from ionized hydrogen ⓘ |
| environment | surrounds Orion A and Orion B molecular clouds ⓘ |
| excitationSource | ultraviolet radiation from young massive stars ⓘ |
| galacticLocation | Orion Arm of the Milky Way NERFINISHED ⓘ |
| gasComposition | ionized hydrogen-dominated gas ⓘ |
| ionizedBy | massive stars in Orion OB1 association ⓘ |
| likelyOrigin | past supernova explosions and stellar winds in Orion OB1 ⓘ |
| locatedInConstellation | Orion NERFINISHED ⓘ |
| observationalChallenge | low surface brightness ⓘ |
| observedInWavelength |
infrared
ⓘ
optical ⓘ radio ⓘ |
| orientation | curves from north of Orion’s Belt around to south of Orion’s Sword ⓘ |
| partOf |
Orion molecular cloud complex
NERFINISHED
ⓘ
Orion-Eridanus superbubble NERFINISHED ⓘ |
| photographicAppearance | large red arc around Orion ⓘ |
| physicalNature | ionized shell surrounding hot, low-density cavity ⓘ |
| regionOfSky | Orion constellation region near Belt and Sword ⓘ |
| relatedTo |
Flame Nebula
NERFINISHED
ⓘ
Horsehead Nebula NERFINISHED ⓘ Orion Nebula (M42) NERFINISHED ⓘ Running Man Nebula NERFINISHED ⓘ |
| requiresForImaging | long-exposure wide-field astrophotography ⓘ |
| shape | large arc ⓘ |
| skyLocation | encircles much of the Orion constellation’s central region ⓘ |
| structureType | expanding shell or bubble ⓘ |
| visibility | faint ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.