| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 20m 32.61474s[2] |
| Declination | +08° 55′ 08.1627″[2] |
| Apparent magnitude (V) | 6.9–13.8[3] |
| Characteristics | |
| Spectral type | M5e – M8.5e[3] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | 5.0±4.6[4] km/s |
| Proper motion (μ) | RA: −18.494mas/yr[2] Dec.: −17.197mas/yr[2] |
| Parallax (π) | 1.399±0.083 mas[5] |
| Distance | 2,300 ± 100 ly (710 ± 40 pc) |
| Details | |
| Radius | 278–316[5] R☉ |
| Luminosity | 6,545+583 −531[5] L☉ |
| Surface gravity (log g) | −0.45 to−0.39[5] cgs |
| Temperature | 2,910–2,932[5] K |
| Other designations | |
| S Peg,BD+08° 5047a,HD 220033,HIP 115242 | |
| Database references | |
| SIMBAD | data |
S Pegasi (S Peg) is aMira variable star in theconstellationPegasus. It varies between magnitude 7 and 13 with a period of 319.22 days.[3] It is believed to be pulsating in the firstovertone. First overtone pulsators have masses less than 1.8 M☉ at a temperature of 2,107 K, and less than 1.4 M☉ at the luminosity of S Pegasi.[6]
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