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khi Cygni

Khi Cygni is one of the longest-studied variable stars, having been discovered in the 17th Century.  Khi Cyg (also spelled "chi Cyg") is a bright Mira variable, a pulsating star near the end of its life with a period of about 400 days, and an enormous amplitude of 10 magnitudes or more per cycle.  All stars like our Sun will become Mira variables near the ends of their lives, and by studying khi Cyg and other Miras, we can get a glimpse of what the fate of our own Sun will be, billions of years from now.

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484