55 Persei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 04h 24m 29.1556s |
| Declination | +34° 07′ 50.728″ |
| Apparent magnitude (V) | 5.73 |
| Characteristics | |
| Spectral type | B8 V |
| B−V color index | −0.054±0.004 |
| Astrometry | |
| Radial velocity (Rv) | +8.5±3.5 km/s |
| Proper motion (μ) | RA: +21.092 mas/yr Dec.: −34.137 mas/yr |
| Parallax (π) | 8.50±0.38 mas |
| Distance | 380 ± 20 ly (118 ± 5 pc) |
| Absolute magnitude (MV) | −0.39 |
| Details | |
| Mass | 3.44±0.07 M☉ |
| Radius | 3.0 R☉ |
| Luminosity | 193+24 −21 L☉ |
| Temperature | 12,246±85 K |
| Rotational velocity (v sin i) | 288 km/s |
| Age | 197 Myr |
| Other designations | |
| 55 Per, BD+33° 853, HD 27777, HIP 20579, HR 1377, SAO 57212 | |
| Database references | |
| SIMBAD | data |
55 Persei is a single, blue-white hued star in the northern constellation Perseus. It is faintly visible to the naked eye under good seeing conditions, having an apparent visual magnitude of 5.73. Based upon an annual parallax shift of 8.50±0.38 mas as seen from Earth's orbit, the star is located about 380 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.39 due to interstellar dust.
This is a B-type main-sequence star with a stellar classification of B8 V; a massive star that is generating energy through hydrogen fusion at its core. It has 3.44 times the mass of the Sun and about 3 times the Sun's radius. The star is about 197 million years old and is spinning rapidly with a projected rotational velocity of 288 km/s. It is radiating roughly 193 times the Sun's luminosity from its photosphere at an effective temperature of 12,246 K.