Caldwell 20
E491337
Caldwell 20 is a large, bright emission nebula in the constellation Cygnus, notable for its distinctive shape resembling the outline of the North American continent.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
deep-sky object ⓘ emission nebula ⓘ |
| alsoKnownAs | North America Nebula NERFINISHED ⓘ |
| angularSize | about 120 arcminutes ⓘ |
| apparentMagnitude | 4.0 ⓘ |
| associatedWithStar | Deneb NERFINISHED ⓘ |
| bestSeenFromHemisphere | Northern Hemisphere NERFINISHED ⓘ |
| bestViewingSeason | summer ⓘ |
| catalogCode | C20 ⓘ |
| catalogNumber | NGC 7000 NERFINISHED ⓘ |
| contains |
interstellar dust
ⓘ
interstellar gas ⓘ star-forming regions ⓘ |
| containsRegion |
Central America region
NERFINISHED
ⓘ
East Coast region NERFINISHED ⓘ Gulf of Mexico region NERFINISHED ⓘ Mexico region ⓘ |
| declination | +44° 20′ ⓘ |
| discoveredBy | William Herschel NERFINISHED ⓘ |
| discoveryYear | 1786 ⓘ |
| distanceFromEarth |
about 2600 light-years
ⓘ
about 800 parsecs ⓘ |
| dominantColor | red ⓘ |
| dominantEmissionLine | H-alpha ⓘ |
| excitedBy | nearby hot young stars ⓘ |
| galacticLatitude | about +2.0 degrees ⓘ |
| galacticLongitude | about 85.5 degrees ⓘ |
| hasDistinctiveShape | resembles outline of North American continent ⓘ |
| includedIn | New General Catalogue NERFINISHED ⓘ |
| ionizingSource | Deneb NERFINISHED ⓘ |
| locatedIn | Cygnus Arm of the Milky Way NERFINISHED ⓘ |
| locatedInConstellation | Cygnus NERFINISHED ⓘ |
| nearbyObjectOnSky | Pelican Nebula NERFINISHED ⓘ |
| observedInWavelength |
hydrogen-alpha
ⓘ
visible light ⓘ |
| observingRequirement | dark skies for best visibility ⓘ |
| partOf | Milky Way NERFINISHED ⓘ |
| partOfCatalog | Caldwell catalogue NERFINISHED ⓘ |
| rightAscension | 20h 58m ⓘ |
| separatedFromNearbyObjectBy | dark dust lane ⓘ |
| skyLocation | near star Deneb in Cygnus ⓘ |
| typeOfNebula | diffuse nebula ⓘ |
| visibleToNakedEye | as faint glow under dark skies ⓘ |
| visibleWith |
small telescope
ⓘ
wide-field binoculars ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.