IC418
E540379
IC 418 is a small, bright planetary nebula in the constellation Lepus, often called the Spirograph Nebula for its intricate, filamentary appearance.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| IC 418 | 0 |
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
emission nebula
ⓘ
planetary nebula ⓘ |
| alternativeName | Spirograph Nebula NERFINISHED ⓘ |
| angularDiameter | ~12 arcseconds ⓘ |
| apparentMagnitudeV | ~9.6 ⓘ |
| bestSeenIn | small to medium amateur telescopes ⓘ |
| catalog | Index Catalogue NERFINISHED ⓘ |
| catalogNumber | IC 418 NERFINISHED ⓘ |
| centralStarEffectiveTemperature | ~39,000 K ⓘ |
| centralStarType | hot white dwarf ⓘ |
| declination | -12° 42′ (approx) ⓘ |
| discoveredBy | Williamina Fleming NERFINISHED ⓘ |
| discoveryYear | 1891 ⓘ |
| distanceFromEarth |
~1.1 kiloparsecs
ⓘ
~3600 light-years ⓘ |
| dominantEmissionLines |
H-alpha
ⓘ
[N II] ⓘ [O III] ⓘ |
| evolutionaryStage | late stage of low- to intermediate-mass star ⓘ |
| excitationClass | high-excitation nebula ⓘ |
| expandingGas | ionized gas shell ⓘ |
| formationMechanism | ejected outer layers of dying star ⓘ |
| hasCentralStarMagnitude | ~10.2 ⓘ |
| hasColor | reddish and greenish hues in images ⓘ |
| hasStructure |
fainter outer halo
ⓘ
inner bright shell ⓘ |
| imageNicknameOrigin | Spirograph-like pattern in HST images ⓘ |
| ionizationSource | ultraviolet radiation from central star ⓘ |
| locatedInConstellation | Lepus NERFINISHED ⓘ |
| locatedInGalaxy | Milky Way NERFINISHED ⓘ |
| morphologicalType | elliptical planetary nebula ⓘ |
| notableFor |
high surface brightness
ⓘ
intricate filamentary structure ⓘ ring-like inner shell ⓘ |
| observedBy | Hubble Space Telescope NERFINISHED ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
| rightAscension | 05h 27m (approx) ⓘ |
| shapeDescription | nearly circular on the sky ⓘ |
| spectralFeatures |
recombination lines of hydrogen and helium
ⓘ
strong forbidden lines ⓘ |
| surfaceBrightness | high ⓘ |
| visibleFromHemisphere | Southern Hemisphere NERFINISHED ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.