Shapey-Sawyer Globular Cluster Concentration Classifications

Globular Cluster Observing Program Coordinator:

Bob Kerr
7300 Bristol Village Drive, #113
Bloomington, MN 55438
(952) 944-7743
E-mail: kerr_comm@hotmail.com

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All images are in the Public Domain.

Class I – High concentration of stars towards the center

Messier 80

 

Class II – Dense central concentration of core stars

Messier 2

 

Class III – Strong inner concentration of core stars

Messier 54

 

Class IV – Intermediately rich concentration of core stars

Messier 15

 

Class V – Intermediate concentration of core stars

Messier 13

 

Class VI – Intermediately mild concentration of core stars

Messier 3

 

Class VII – Intermediately loose concentration of core stars

Messier 22

 

Class VIII – Rather loose concentration of core stars

Messier 14

 

Class IX – Loose concentration of core stars

Messier 12

 

Class X – Very loose concentration of core stars

Messier 68

 

Class XI – Almost no concentration of core stars

Messier 55

Class XII

Palomar 12

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