NGC 3918
E498147
NGC 3918 is a bright planetary nebula in the southern sky, often called the "Blue Planetary" due to its vivid blue appearance.
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf | planetary nebula ⓘ |
| angularSize | approximately 20 arcseconds ⓘ |
| apparentMagnitudeV | 8.5 ⓘ |
| belongsToGalaxy | Milky Way NERFINISHED ⓘ |
| bestSeenWith | small to medium amateur telescopes ⓘ |
| carriesCaldwellNumber | C90 NERFINISHED ⓘ |
| catalog |
Caldwell catalogue
NERFINISHED
ⓘ
New General Catalogue NERFINISHED ⓘ |
| catalogNumber | NGC 3918 NERFINISHED ⓘ |
| centralStar | hot white dwarf ⓘ |
| color | blue ⓘ |
| declination | −57° 11′ ⓘ |
| discoveredBy | John Herschel NERFINISHED ⓘ |
| discoveryYear | 1834 ⓘ |
| distanceFromEarth |
approximately 1.5 kiloparsecs
ⓘ
approximately 4900 light-years ⓘ |
| dominantIon | doubly ionized oxygen (O III) ⓘ |
| ejectionOrigin | outer layers of a dying star ⓘ |
| excitationClass | high-excitation planetary nebula ⓘ |
| galacticLatitude | +11.7 degrees (approximate) ⓘ |
| galacticLongitude | 294.6 degrees (approximate) ⓘ |
| hasAlternativeName |
Blue Planetary
NERFINISHED
ⓘ
Caldwell 90 NERFINISHED ⓘ The Blue Planetary NERFINISHED ⓘ |
| hasEmission | ionized gas ⓘ |
| hasStructure |
bright inner shell
ⓘ
fainter outer halo ⓘ |
| hemisphere | southern sky ⓘ |
| isTargetFor |
amateur astronomers
ⓘ
planetary nebula evolution studies ⓘ |
| locatedInConstellation | Centaurus NERFINISHED ⓘ |
| morphologicalType | elliptical planetary nebula ⓘ |
| notableFor | vivid blue appearance ⓘ |
| observationalClass | bright planetary nebula ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
| phaseOfStellarEvolution | late stage of low- to intermediate-mass star ⓘ |
| rightAscension | 11h 50m ⓘ |
| skyRegion | near the Crux–Centaurus area ⓘ |
| spectralFeatures | strong [O III] emission lines ⓘ |
| surfaceBrightness | high ⓘ |
| visibilitySeason | autumn and winter in Southern Hemisphere ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.