Pismis 20
MK spectral classification
No
Ref
MK
0005
985
B0 III
0006
985
O9.5 III
0007
985
O9.5 Ib
0008
985
B1.5 IaO
0009
985
O9 III
0011
985
B0 Ib
0013
985
O9 V+?
0025
985
WN6