List of most massive stars

This is an incomplete list of the most massive stars discovered.

Although O type stars are considered the most massive stars in the main sequence, evolved stars such as wolf-rayet stars and luminous blue variables can be just as massive or even more massive than them.

These stars are extremely luminous, observing them are very difficult because they are extremely rare and most of them are located in young star-forming regions very far away. Stars at larger distances can be hard to observe, the large amount of gas surrounding them can make them much harder to even be detected.

List

The stars in the list below are at least 100 solar masses.

1 solar mass = 1.989e+30 kg

Star name	Galaxy	Mass (in solar masses)	Spectral type	More information
Westerhout 49-2	Milky Way	250±120	O2-3.5If*
BAT99-98	Large Magellanic Cloud	226	N/A
R136a1	Large Magellanic Cloud	196	WN5h
Melnick 42	Large Magellanic Cloud	189	O2If*
Westerhout 51-57	Milky Way	160	O4V
R136a3	Large Magellanic Cloud	155	WN5h
VFTS 682	Large Magellanic Cloud	153	WN5h
HD 15558 A	Milky Way	152	O5.5III(f)
R136a2	Large Magellanic Cloud	151	WN5h
Melnick 34	Large Magellanic Cloud	147	WN5h
R136c	Large Magellanic Cloud	142	WN5h
HD 97950 B	Milky Way	132	WN6h
HD 269810	Large Magellanic Cloud	130	O2III(f*)
HD 97950 A1a	Milky Way	120	WN6h
WR 24	Milky Way	114	N/A
Cygnus OB2#12	Milky Way	110	B3-4Ia+	Candidate LBV
HD 93129	Milky Way	110	O2If*
Westerhout 49-3	Milky Way	105	O3-O7V
R99	Large Magellanic Cloud	103	LBV
WR 102ka	Milky Way	100	Ofpe/WN9
Eta Carinae A	Milky Way	100	LBV

The Sun has one solar mass.