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Morphology Revisited

De Vaucouleurs has proposed the coding system at right based on the basic Hubble sequence. This is a potentially useful system since each galaxy type can be designated by a single number. Of course, as has always been the case, the designations are purely descriptive and do not necessarily imply any related physical processes or evolution.

Notice that the De Vaucleurs morphological system does not provide a separate designation for the barred spirals.

Morphology
Classes
Type
Varieties
-6
ellipticals
cE
compact
-5
 
E0-7
normal ellipticals
-4
 
cD
giant ellipticals
-3
early lenticular
 
 
-2
lenticulars
S0
 
-1
late lenticular
 
 
0
spirals
S0/a
 
1
 
Sa
 
2
 
Sab
 
3
 
Sb
 
4
 
Sbc
 
5
 
Sc
 
6
 
Scd
 
7
 
Sd
 
8
 
Sdm
 
9
 
Sm
 
10
irregulars
Im
Magellanic
11
 
cI
compact

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This page was last modified on Saturday 31st January 2009 @ 13:06pm

Science Mission Directorate Universe Division

Responsible SSU Personnel:

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