Classification of Galaxy Types
This table explains the classification of galaxies into different types. The table has been adopted from the Third Reference Catalogue of Bright Galaxies, Volume I by Gérard de Vaucouleurs et al.
Classes |
Families |
Varieties |
Stages |
T |
Type |
Code |
Ellipticals |
|
Compact |
|
-6 |
cE |
cE... |
|
|
|
Ellipt. (0-6) |
-5 |
E0 |
.E.0. |
|
|
|
Intermediate |
-5 |
E0-1 |
.E.0+ |
|
|
"cD" |
|
-4 |
E+ |
.E+.. |
Lenticulars |
|
|
|
|
S0 |
.L |
|
Non-barred |
|
|
|
SA0 |
.LA |
|
Barred |
|
|
|
SB0 |
.LB |
|
Mixed |
|
|
|
SAB0 |
.LX |
|
|
Inner ring |
|
|
S(r)0 |
.L.R |
|
|
S-shaped |
|
|
S(s)0 |
.L.S |
|
|
Mixed |
|
|
S(rs)0 |
.L.T |
|
|
|
Early |
-3 |
S0- |
.L..- |
|
|
|
Intermediate |
-2 |
S0° |
.L..0 |
|
|
|
Late |
-1 |
S0+ |
.L..+ |
Spirals |
Non-barred |
|
|
|
SA |
.SA |
|
Barred |
|
|
|
SB |
.SB |
|
Mixed |
|
|
|
SAB |
.SX |
|
|
Inner ring |
|
|
S(r) |
.S.R |
|
|
S-shaped |
|
|
S(s) |
.S.S |
|
|
Mixed |
|
|
S(rs) |
.S.T |
|
|
|
0/a |
0 |
S0/a |
.S..0 |
|
|
|
a |
1 |
Sa |
.S..1 |
|
|
|
ab |
2 |
Sab |
.S..2 |
|
|
|
b |
3 |
Sb |
.S..3 |
|
|
|
bc |
4 |
Sbc |
.S..4 |
|
|
|
c |
5 |
Sc |
.S..5 |
|
|
|
cd |
6 |
Scd |
.S..6 |
|
|
|
d |
7 |
Sd |
.S..7 |
|
|
|
dm |
8 |
Sdm |
.S..8 |
|
|
|
m |
9 |
Sm |
.S..9 |
Irregulars |
Non-barred |
|
|
|
IA |
.IA |
|
Barred |
|
|
|
IB |
.IB |
|
Mixed |
|
|
|
IAB |
.IX |
|
|
S-shaped |
|
|
I(s) |
.I.S |
|
|
|
Non-Magellanic |
90 |
I0 |
.I.0 |
|
|
|
Magellanic |
10 |
Im |
.I..9 |
|
|
Compact |
|
11 |
cI |
cI |
Peculiars |
|
|
|
99 |
Pec |
.P |
Peculiarities |
|
|
Peculiarity |
|
pec |
.....P |
(All types) |
|
|
Uncertain |
|
: |
....* |
|
|
|
Doubtful |
|
? |
....? |
|
|
|
Spindle |
|
sp |
...../ |
|
|
|
Outer ring |
|
(R) |
R...... |
|
|
|
Pseudo-outer R |
|
(R') |
P...... |
Classes |
Families |
Varieties |
Stages |
T |
Type |
Code |
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