Astrophysics (index)about

Morgan Classification

(Morgan's Classification, Yerkes Classification)
(classification of galaxies by stellar spectrum and morphology)

The Morgan Classification (a Galaxy Classification scheme) classifies the Galaxy by its prominent stellar Spectral Class, then according to morphology, and then according to the angle of view.

symbol prominent stars
a A-Type Stars
f F-Type Stars
g G-Type Stars
k K-Type Stars
af a to f class
fg f to g class
gk g to k class
symbol shape, etc.
S Spiral Galaxy
B barred spiral
E Elliptical Galaxy
D other rotational symmetry
I irregular
L low Surface Brightness
N small bright nucleus (N Galaxy)
Ep elliptical with Dust Absorption

Inclination (as seen from Earth) is indicated by a number 1-7, 1 for face-on to 7 for edge-on.



Referenced by:
N Galaxy