Black Hole
A black hole binary that erupted dramatically in 2015 after 26 years of quiet, briefly becoming one of the brightest X-ray sources in the sky.
| Type | Black Hole |
|---|---|
| Black hole type | Stellar |
| Distance from Earth | 7,800 ly |
| Diameter | 53 km |
| Mass | 1.79 × 10^31 kg |
| Apparent magnitude | 11.2 |
| Redshift | 0 |
| Hemisphere | Northern |
| Discovered | 1989 |
Its mass is 9.0 times the mass of the Sun.
The light reaching us from V404 Cygni tonight left it around 7,800 years ago.
It has been on record since 1989.
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