S Persei is a red supergiant located near the Double Cluster in Perseus, north of the cluster NGC 869.
Quick facts Observation data Epoch J2000 Equinox J2000, Constellation ...
S Persei
Location of S Persei (circled) near the Double Cluster (north is left) |
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 |
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| 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) |
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| Details |
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| 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 |
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| Other designations |
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S Per, HD 14528, HIP 11093, BD+57°552, SAO 23261, WDS J02229+5835, AAVSO 0215+58 |
| Database references |
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| SIMBAD | data |
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