Spectral type characteristics

Main sequence stars (V)

Spectral Type Temperature (K) Absolute Magnitude Luminosity (in solar luminosities) Mass (in solar masses)
O5 54,000 -10.0 846,000 30.3
O6 45,000 -8.8 275,000 22.9
O7 43,300 -8.6 220,000 21.7
O8 40,600 -8.2 150,000 19.7
O9 37,800 -7.7 95,000 17.6
B0 29,200 -6.0 20,000 12.0
B1 23,000 -4.4 4600 8.24
B2 21,000 -3.8 2600 7.14
B3 17,600 -2.6 900 5.48
B5 15,200 -1.6 360 4.36
B6 14,300 -1.2 250 3.98
B7 13,500 -0.84 175 3.64
B8 12,300 -0.23 100 3.16
B9 11,400 0.29 62 2.81
A0 9600 1.4 22 2.17
A1 9330 1.6 18 2.06
A2 9040 1.8 15 1.97
A3 8750 2.1 12 1.86
A4 8480 2.3 10 1.78
A5 8310 2.4 9.0 1.73
A7 7920 2.7 6.7 1.61
F0 7350 3.2 4.3 1.44
F2 7050 3.5 3.3 1.35
F3 6850 3.7 2.8 1.29
F5 6700 3.8 2.4 1.25
F6 6550 4.0 2.1 1.20
F7 6400 4.1 1.8 1.16
F8 6300 4.2 1.7 1.14
G0 6050 4.5 1.3 1.07
G1 5930 4.6 1.2 1.04
G2 5800 4.8 1 1.00
G5 5660 4.9 0.86 0.963
G8 5440 5.2 0.68 0.908
K0 5240 5.4 0.54 0.857
K1 5110 5.6 0.46 0.824
K2 4960 5.8 0.38 0.785
K3 4800 6.0 0.31 0.746
K4 4600 6.3 0.24 0.700
K5 4400 6.6 0.19 0.660
K7 4000 7.3 0.10 0.562
M0 3750 7.7 0.069 0.513
M1 3700 7.8 0.064 0.503
M2 3600 7.9 0.054 0.482
M3 3500 8.1 0.046 0.463
M4 3400 8.3 0.038 0.442
M5 3200 8.7 0.026 0.402
M6 3100 8.9 0.022 0.385
M7 2900 9.4 0.014 0.346
M8 2700 9.9 0.0093 0.311
L0 2600 * 0.0074 0.293
L3
 2200
 *
 0.0027
 0.227
L8
 1500
 *
 0.00026
 0.126
T2
 1400
 *
 0.00017
 0.114
T6
 1000
 *
 0.000021
 0.0680
T8
 800
 *
 0.0000055
 0.0483
*- 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