F dating txt 596

Fabricius assumed it was a nova, but then saw it again on February 16, 1609.

In 1638 Johannes Holwarda determined a period of the star's reappearances, eleven months; he is often credited with the discovery of Mira's variability.

Mira A is a pulsating variable star and was the first non-supernova variable star discovered, with the possible exception of Algol.

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By August 21, however, it had increased in brightness by one magnitude, then by October had faded from view.Johannes Hevelius was observing it at the same time and named it Mira in 1662, for it acted like no other known star.Ismail Bouillaud then estimated its period at 333 days, less than one day off the modern value of 332 days., alternatively designated Omicron Ceti (ο Ceti, abbreviated Omicron Cet, ο Cet) is a red giant star estimated to be 200–400 light years from the Sun in the constellation of Cetus.ο Ceti is a binary stellar system, consisting of a variable red giant (Mira A) along with a white dwarf companion (Mira B).

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