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→Classification: HTTP --> HTTPS [#1], replaced: http://books.google.com → https://books.google.com
==Classification==
==Classification==
In 1930, Swiss-American astronomer R.J Trumpler introduced a classification system for open clusters, later known as the ''Trumpler classification'', based on three defining attributes.<ref>Garfinkle, R. (1999). ''Star-hopping: Your Visa to Viewing the Universe''. Cambridge (England): Cambridge University Press. [http://books.google.com/books?id=40JzBYGREL0C&pg=PA74&dq=%22Trumpler+classification%22&ei=bMLDSLHnD5TqjgHkqeTrDQ&sig=ACfU3U0fxdckqWt_w6eawA44vGIJmi2yJg#v=onepage&q=%22Trumpler%20classification%22&f=false Online]</ref> The first attribute is according to how concentrated the cluster is towards it's center, ranging from I-IV:
In 1930, Swiss-American astronomer R.J Trumpler introduced a classification system for open clusters, later known as the ''Trumpler classification'', based on three defining attributes.<ref>Garfinkle, R. (1999). ''Star-hopping: Your Visa to Viewing the Universe''. Cambridge (England): Cambridge University Press. [https://books.google.com/books?id=40JzBYGREL0C&pg=PA74&dq=%22Trumpler+classification%22&ei=bMLDSLHnD5TqjgHkqeTrDQ&sig=ACfU3U0fxdckqWt_w6eawA44vGIJmi2yJg#v=onepage&q=%22Trumpler%20classification%22&f=false Online]</ref> The first attribute is according to how concentrated the cluster is towards it's center, ranging from I-IV:
*I - Detached from the surrounding stars with strong concentration towards the cluster center
*I - Detached from the surrounding stars with strong concentration towards the cluster center