Messier 17
E105137
Messier 17, also known as the Omega or Swan Nebula, is a bright star-forming emission nebula located in the constellation Sagittarius.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Messier 17 canonical | 4 |
| M17 (Omega Nebula) | 1 |
| M17 star-forming region | 1 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
Messier object ⓘ NGC object ⓘ emission nebula ⓘ star-forming region ⓘ |
| addedToMessierCatalogueBy | Charles Messier ⓘ |
| alsoKnownAs |
Checkmark Nebula
ⓘ
Swan Nebula ⓘ
surface form:
Horseshoe Nebula
Omega Nebula ⓘ Swan Nebula ⓘ |
| angularSize | 11 arcminutes × 6 arcminutes ⓘ |
| apparentMagnitudeV | 6.0 ⓘ |
| bestSeenIn |
binoculars
ⓘ
small telescopes ⓘ summer ⓘ |
| catalogNumber |
M17
ⓘ
NGC 6618 ⓘ |
| contains |
dust lanes
ⓘ
molecular clouds ⓘ open star cluster ⓘ young massive stars ⓘ |
| declination | −16° 11′ ⓘ |
| discoveredBy | Philippe Loys de Chéseaux ⓘ |
| discoveryYear | 1745 ⓘ |
| distanceFromEarth |
about 1.6 kiloparsecs
ⓘ
about 5,000 light-years ⓘ |
| dominantEmissionLines | hydrogen alpha ⓘ |
| galacticLatitude | −0.7 degrees (approximate) ⓘ |
| galacticLongitude | 15.1 degrees (approximate) ⓘ |
| hasShapeAppearance |
omega-shaped
ⓘ
swan-like ⓘ |
| ionizingSource | massive O-type stars ⓘ |
| locatedIn |
Milky Way
ⓘ
Sagittarius Arm ⓘ |
| locatedInConstellation | Sagittarius ⓘ |
| locatedNear | galactic plane ⓘ |
| messierCatalogueEntryYear | 1764 ⓘ |
| observableFrom |
Northern Hemisphere
ⓘ
Southern Hemisphere ⓘ |
| partOf | a giant molecular cloud complex ⓘ |
| regionType | massive star-forming complex ⓘ |
| rightAscension | 18h 20m ⓘ |
| spectralType | H II emission ⓘ |
| starFormationActivity | intense ⓘ |
| visibleInWavelength |
infrared
ⓘ
optical ⓘ radio ⓘ |
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
M17 star-forming region
this entity surface form:
M17 (Omega Nebula)