Cygnus X-1

• Name: Cygnus X-1

• Alternate name: TeV J1958+352

• Category: Stellar Mass Black Hole (21.2 Solar Masses)

• Distance from Earth: 7175.44 light years

• First Discovered: 1964 Rocket Flight, where they discovered a burst of X-rays (Existence confirmed in August 2007)

• Discovered by: NASA (who further investigated in 1970)

• Galactic Longitude: 71.33° 

• Galactic Latitude: 3.07° 

Sources: https://www.nytimes.com/2021/02/18/science/cygnus-black-hole-astronomy.html

http://tevcat.uchicago.edu/?mode=1;id=131

https://www.astronomy.com/science/a-brief-history-of-black-holes/