Ruprecht 91
MK spectral classification
No
Ref
MK
0001
999
K5/M0 III
0002
999
M1 Ib/II
0003
999
B5 III
0004
999
B8 II/III
0050
999
F2 II
0051
999
B1/B2 II/III
0052
999
F5 V