Spectral type characteristics

Main sequence stars (V)

Spectral Type Temperature (K) Absolute Magnitude Luminosity (in solar luminosities)
O5 54,000 -4.5 200,000
O6 45,000 -4.0 140,000
O7 43,300 -3.9 120,000
O8 40,600 -3.8 80,000
O9 37,800 -3.6 55,000
B0 29,200 -3.3 24,000
B1 23,000 -2.3 5550
B2 21,000 -1.9 3190
B3 17,600 -1.1 1060
B5 15,200 -0.4 380
B6 14,300 0 240
B7 13,500 0.3 140
B8 12,300 0.7 73
B9 11,400 1.1 42
A0 9600 1.5 24
A1 9330 1.7 20
A2 9040 1.8 17
A3 8750 2.0 14
A4 8480 2.1 12
A5 8310 2.2 11
A7 7920 2.4 8.8
F0 7350 3.0 5.1
F2 7050 3.3 3.8
F3 6850 3.5 3.2
F5 6700 3.7 2.7
F6 6550 4.0 2.0
F7 6400 4.3 1.5
F8 6300 4.4 1.4
G0 6050 4.7 1.2
G1 5930 4.9 1.1
G2 5800 5.0 1
G5 5660 5.2 0.73
G8 5440 2.6 0.51
K0 5240 6.0 0.38
K1 5110 6.2 0.32
K2 4960 6.4 0.29
K3 4800 6.7 0.24
K4 4600 7.1 0.18
K5 4400 7.4 0.15
K7 4000 8.1 0.11
M0 3750 8.7 0.080
M1 3700 9.4 0.055
M2 3600 10.1 0.035
M3 3500 10.7 0.027
M4 3400 11.2 0.022
M5 3200 12.3 0.011
M6 3100 13.4 0.0051
M7 2900 13.9 0.0032
M8 2700 14.4 0.0020
L0
 2600
 *
 0.00029
L3
 2200
 *
 0.00013
L8
 1500
 *
 0.000032
T2
 1400
 *
 0.000025
T6
 1000
 *
 0.0000056
T8
 800
 *
 0.0000036
*- not visible to the human eye (for the most part)

Giants (III)

Spectral Type Temperature (K) Absolute Magnitude Luminosity (in solar luminosities)
G5 5010 0.7 127
G8 4870 0.6 113
K0 4720 0.5 96
K1 4580 0.4 82
K2 4460 0.2 70
K3 4210 0.1 58
K4 4010 0.0 45
K5 3780 -0.2 32
M0 3660 -0.4 15
M1 3600 -0.5 13
M2 3500 -0.6 11
M3 3300 -0.7 9.5
M4 3100 -0.75 7.4
M5 2950 -0.8 5.1
M6 2800 -0.9 3.3

Supergiants (I)

Spectral Type Temperature (K) Absolute Magnitude Luminosity (in solar luminosities)
B0 21,000 -6.4 320,000
B1 16,000 -6.4 280,000
B2 14,000 -6.4 220,000
B3 12,800 -6.3 180,000
B5 11,500 -6.3 140,000
B6 11,000 -6.3 98,000
B7 10,500 -6.3 82,000
B8 10,000 -6.2 73,000
B9 9700 -6.2 61,000
A0 9400 -6.2 50,600
A1 9100 -6.2 44,000
A2 8900 -6.2 40,000
A5 8300 -6.1 36,000
F0 7500 -6 20,000
F2 7200 -6 18,000
F5 6800 -5.9 16,000
F8 6150 -5.9 12,000
G0 5800 -5.9 9600
G2 5500 -5.8 9500
G5 5100 -5.8 9800
G8 5050 -5.7 11,000
K0 4900 -5.7 12,000
K1 4700 -5.6 13,500
K2 4500 -5.6 15,200
K3 4300 -5.6 17,000
K4 4100 -5.5 18,300
K5 3750 -5.5 20,000
M0 3660 -5.3 50,600
M1 3600 -5.3 52,000
M2 3500 -5.3 53,000
M3 3300 -5.3 54,000
M4 3100 -5.2 56,000
M5 2950 -5.2 58,000