S Persei
S Persei is a red supergiant located near the Double Cluster in Perseus, north of the cluster NGC 869.
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 2h 22m 51.70928s |
| Declination | 58° 31′ 11.4476″ |
| Apparent magnitude (V) | 9.23 (7.9 - 12.0) |
| Characteristics | |
| Spectral type | M4.5I (M3Iae - M7) |
| B−V color index | 2.65 |
| Variable type | SRc |
| Astrometry | |
| Radial velocity (Rv) | -39.71 km/s |
| Proper motion (μ) | RA: −0.49 ± 0.23 mas/yr Dec.: −1.19 ± 0.20 mas/yr |
| Parallax (π) | 0.413 ± 0.017 mas |
| Distance | 7,900 ± 300 ly (2,420 ± 100 pc) |
| Absolute magnitude (MV) | −6.36 (at mV 9.23) |
| Details | |
| Mass | 20 M☉ |
| Radius | 1,212 ± 124, 780 - 1,230 R☉ |
| Luminosity | 86,000 - 186,000 L☉ |
| Surface gravity (log g) | 0.0 cgs |
| Temperature | 3,000–3,600 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
S Persei Media
A visual band light curve for S Persei, plotted from AAVSO data
