| Astrometry | |
|---|---|
| Distance | 8,200 ly (2,510 pc) |
| Details | |
| Mass | ? M☉ |
| Radius | ? R☉ |
| Luminosity | ? L☉ |
| Temperature | ? K |
| Age | ? years |
S Persei is a red supergiant or hypergiant located in the Double Cluster in Perseus, north of the cluster NGC 869. It is a representative of the semiregular variables, whose periods of variation are subject to more irregularities than those of Mira variable red supergiants.
Many of the visually bright (5th - 7th magnitude) variable stars belong to this class of semiregulars, as these stars are extremely large and luminous, and hence visible across long distances. S Persei is as much as 1000 times the sun's diameter.
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