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Spiral galaxies · evidence and sources

Great Barred Spiral Galaxy

An enormous barred spiral with sharply defined arms and a bright central region.

Also known as NGC 1365, NGC1365.

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

Registered image field

J2000 image-field center RA 3.6 h, Dec -36.1°. Field 11.7 × 11.6 arcminutes; north -106.7° right of vertical.

SourceDanish 1.54-m DFOSC
EpochJ2000
LimitThe image field center is not necessarily a galaxy nucleus.
Physical data Catalog

Adopted distance

Approximately 61,000,000 light-years.

SourcePublished distance context
LimitAn approximate reference distance; distances to individual points within the image are not supplied by the observation.
Appearance Reconstructed

Observation-derived appearance

An optical B, V and R composite. The galaxy aperture excludes most unrelated field stars and galaxies; unseen depth is illustrative. Small foreground or background sources inside the selected apertures may remain; they do not have individually measured depths. Projected structure follows the credited observation at its published angular scale and an approximate adopted distance. Shallow depth is illustrative, not measured tomography. The source palette is preserved; brightness is adjusted for the navigable view.

SourceESO/IDA/Danish 1.5 m/ R. Gendler, J-E. Ovaldsen, C. Thöne, and C. Feron.
Appearance Reconstructed

Live telescope view: Webb NIRCam + MIRI

Inspect the dusty central bar and star-forming knots within Webb’s narrower field. The wide outer spiral remains in the original optical view. Publisher release: 29 January 2024; this is not the observing epoch.

SourceNASA, ESA, CSA, STScI, J. Lee (STScI), T. Williams (Oxford), PHANGS Team
MethodPublisher AVM tangent-plane coordinates, resampled to the original destination field; approximate display registration.
LimitThis observation covers approximately 4% of the destination’s rectangular source field. Outside its footprint, the original observation remains visible. Field edges and detector gaps are not physical boundaries. Source palettes are display colors; shallow scene depth is illustrative, not measured tomography.

What is not measured

  • Appearance: a reconstruction from measurements, not a direct observation. Observation-derived appearance. An optical B, V and R composite. The galaxy aperture excludes most unrelated field stars and galaxies; unseen depth is illustrative. Small foreground or background sources inside the selected apertures may remain; they do not have individually measured depths. Projected structure follows the credited observation at its published angular scale and an approximate adopted distance. Shallow depth is illustrative, not measured tomography. The source palette is preserved; brightness is adjusted for the navigable view.
  • Appearance: a reconstruction from measurements, not a direct observation. Live telescope view: Webb NIRCam + MIRI. This observation covers approximately 4% of the destination’s rectangular source field. Outside its footprint, the original observation remains visible. Field edges and detector gaps are not physical boundaries. Source palettes are display colors; shallow scene depth is illustrative, not measured tomography.

Sources cited

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