| 11. | R Doradus is one of the many variable stars in Dorado.
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| 12. | Many of them are variable stars, mostly pulsating ? Cephei itself.
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| 13. | Shortly afterwards it received its variable star designation of DL Crucis.
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| 14. | He concentrated on variable stars, planets and their Nova Persei 1901.
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| 15. | U Lacertae is a variable star classified as a semiregular variable.
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| 16. | The American Association of Variable Star Observers recommends watching them for future events.
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| 17. | It was discovered to be a variable star by Hans Geelmuyden in 1876.
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| 18. | It is a variable star in the constellation of Canis Major.
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| 19. | It was given the variable star designation VY CMa in 1939.
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| 20. | Used for the monitoring of variable stars and other transient events.
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