NGC 7009
E867057
NGC 7009, also known as the Saturn Nebula, is a bright planetary nebula notable for its ringed, Saturn-like appearance in the constellation Aquarius.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
emission nebula
ⓘ
planetary nebula ⓘ |
| bestSeenIn | small to medium telescopes ⓘ |
| catalog |
Caldwell catalogue
NERFINISHED
ⓘ
New General Catalogue NERFINISHED ⓘ |
| centralStarEffectiveTemperature | about 82,000 K ⓘ |
| centralStarEvolutionaryStage | white dwarf precursor ⓘ |
| centralStarSpectralType | O-type ⓘ |
| discoveredBy | William Herschel NERFINISHED ⓘ |
| discoveryDate | 1782 ⓘ |
| dominantEmissionLine | [O III] ⓘ |
| hasAlternativeName |
Caldwell 55
NERFINISHED
ⓘ
Saturn Nebula NERFINISHED ⓘ |
| hasAngularSize | about 25 arcseconds × 17 arcseconds (main body) ⓘ |
| hasApparentMagnitudeV | 8.0 ⓘ |
| hasApproximateAge | a few thousand years as a planetary nebula ⓘ |
| hasCentralStar | HD 200516 NERFINISHED ⓘ |
| hasColor |
bluish
ⓘ
greenish ⓘ |
| hasDeclination | −11° 21′ 48″ ⓘ |
| hasDistanceFromEarth |
about 1400 parsecs
ⓘ
about 4600 light-years ⓘ |
| hasEquinox | J2000 ⓘ |
| hasExpansion | expanding gas shell ⓘ |
| hasGalacticLatitude | −34.6° (approximate) ⓘ |
| hasGalacticLongitude | 37.8° (approximate) ⓘ |
| hasIonizedGas |
helium
ⓘ
hydrogen ⓘ neon ⓘ nitrogen ⓘ oxygen ⓘ |
| hasMorphology |
Saturn-like appearance
ⓘ
elliptical ⓘ ring-like ⓘ |
| hasNotableFeature |
ansae (handle-like extensions)
ⓘ
bright inner shell ⓘ fainter outer envelope ⓘ halo ⓘ jets ⓘ knots ⓘ multiple shells ⓘ |
| hasRightAscension | 21h 04m 10.8s ⓘ |
| isObservableFrom | both hemispheres ⓘ |
| isPartOf | Milky Way Galaxy NERFINISHED ⓘ |
| isStudiedFor |
ionization structure of nebulae
ⓘ
planetary nebula morphology ⓘ |
| locatedInConstellation | Aquarius NERFINISHED ⓘ |
| originatesFrom | ejected outer layers of a dying star ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.