Specimens of double stars

From Herschel, J. (1875)

(836) The following may be taken as specimens of each class. They are all taken from among the lucid, or conspicuous stars, and to such of our readers as may be in possession of telescopes, and may be disposed to try them on such objects, will afford him a ready test of their degree of efficiency.

Class I., 0" to 1"

Class II., 1" to 2"

Class III., 2" to 4"

Class IV., 4" to 8"

Class V., 8" to 12"

Class VI., 12" to 16"

Class VII., 16" to 24"

Class VIII., 24" to 32"

Notes, Separation (") and Period (P) in years given for some stars.


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Created 19/6/01
Last modified