X-ray source name
Mass* of companion
Mass* of black hole
Cygnus X-1
24–42
11–21
V404 Cygni
∼0.6
10–15
V461 Sgr
∼10
5.5–8
GS 2000+25
∼0.7
6–14
H 1705-250
0.3–0.6
6.4–6.9
GRO J1655-40
2.34
7.02
A 0620-00
0.2–0.7
5–10
GS 1124-T68
0.5–0.8
4.2–6.5
GRO J042+32
∼0.3
4U 1543-47
∼2.5
2.7–7.5