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Star system · evidence and sources

Cygnus X-1

A measured 21-solar-mass black hole capturing the focused wind of the blue supergiant HDE 226868.

HYG 4.2 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 distance

Cygnus X-1 is placed at J2000 RA 20 h, Dec 35.2° at 7,240 light-years (spectral class O9.7 Iab + black hole).

SourceBundled star record; the live star field uses HYG v4.2
EpochJ2000
MethodThe live star field draws the same star from the HYG v4.2 catalog (Hipparcos, Yale BSC, Gliese) with proper motion applied to the simulation date.
LimitThe bundled coordinates carry no recorded retrieval; the HYG catalog behind the star field is the documented source for the same star.
Description Undocumented

Description and facts

The short description and the fact list are written by the Space Time authors for orientation. They are not quoted from a catalog field and carry no citation of their own.

SourceSpace Time editorial text

What is not measured

Nothing on this page is a reconstruction or a schematic; every record above is observed, catalogued or computed.

Not yet documented

  • Physical data: no record. Space Time does not claim a source for this aspect.
  • Appearance: no record. Space Time does not claim a source for this aspect.
  • Description: The short description and the fact list are written by the Space Time authors for orientation. They are not quoted from a catalog field and carry no citation of their own.

Dataset freshness

Snapshots this page depends on, read from the generated manifests at request time.
DatasetLast refreshedHorizonAutomated
Nearest Gaia DR3 sources
ESA Gaia DR3
 no snapshot date Epoch 2016.0 astrometry with proper motion and covariance for parallax > 40 mas No, refreshed by hand
scripts/build-gaia-nearby

Sources cited

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