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Updated: May 3, 2025
It was not noticed again till the year 1637, when an observer rejoicing in the name of Phocyllides Holwarda observed it, and, keeping a watch, after it had vanished, upon the place where it had appeared, saw it again come into view nine months after its disappearance. Since then it has been known as a variable star with a period of about 331 days 8 hours.
It was, nevertheless, visible in 1603, when Bayer marked it in his catalogue with the Greek letter Omicron, and was watched, in 1638-39, through its phases of brightening and apparent extinction by a Dutch professor named Holwarda.
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