NGC 663
Selected MK spectral classification
No
Ref
MKS
0004
64
B9 IB
0021
64
B8 II
0027
64
A5 II
0040
64
B6 IA
0054
64
B5 IB
0107
64
B8 IB
0141
64
B9 V N E
0221
64
B6 IAB