18.3
Apparent Mag7,800
Distance (ly)K3V
Spectral Type4,800
Temperature (K)V404 Cygni is a low-mass X-ray binary containing a black hole and a K-type companion. It undergoes dramatic X-ray outbursts.
Stellar Data
Apparent Magnitude18.3
Absolute Magnitude4
Distance7,800 light-years
Spectral TypeK3V
Temperature4,800 K
Luminosity0.7 L☉
Radius6 R☉
Mass0.7 M☉
Right Ascension20h 24m 03.8s
Declination+33° 52′ 01.9″
ConstellationCygnus
Notable Facts
- V404 Cygni contains a black hole of about 9 solar masses
- It underwent a dramatic outburst in 2015
- The visible companion is a K-type star