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Eta
Its story
Eta Cygni is an orange giant 135 light-years away, but its quiet fame comes from what hides nearby: barely half a degree away glows HD 226868, the visible companion of Cygnus X-1, the first stellar black hole confirmed by science. Eta Cygni is the binocular beacon astronomers have used for decades to point toward that invisible abyss in the Swan.
- Constellation
- Cygnus
- Apparent magnitude
- 3.89
- Distance
- 135.0 light years
- Coordinates (J2000)
- RA 299.077° · Dec 35.083°
- Catalogue
- HIP 98110 · HD 188947
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