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Star-forming emission nebula · evidence and sources

Eagle Nebula

Also known as M16, Messier 16, IC 4703, NGC 6611.

Catalog Position basis, the same label the app shows on the selection card.

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Every aspect, with its origin

One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.

ObservedCatalogComputedReconstructedIllustrativeUndocumented
Position Catalog

Sky position and adopted distance

Eagle Nebula is placed at J2000 RA 18.3 h, Dec -13.8° in Serpens, at an adopted distance of 7,000 light-years.

EpochJ2000
LimitNorth and east follow the registered Earth sky plane. The full cloud depth is not measured.
Physical data Catalog

Measured dimensions

Eagle Nebula (star-forming emission nebula; central source NGC 6611, young ionizing star cluster): measured footprint 70 × 55 light-years; display depth 12 light-years (not measured); outer radius used for arrival 35 light-years.

Methodmeasured sky-plane structure with constrained display depth
Appearance Reconstructed

Sky-plane structure with a display depth

The 70 × 55 light-year footprint, named feature positions, and Pillars model follow published observations. The NASA Pillars mesh is an authored scientific visualization, not a tomographic gas map. The surrounding cloud thickness and anonymous emission samples are constrained presentation choices because the full line-of-sight density is not measured.

Methodmeasured sky-plane structure with constrained display depth
LimitEmission points and knots are deterministic presentation samples, not individually catalogued gas parcels.

What is not measured

  • Appearance: a reconstruction from measurements, not a direct observation. Sky-plane structure with a display depth. Emission points and knots are deterministic presentation samples, not individually catalogued gas parcels.

Sources cited

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