| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 04h24m 29.1556s[1] |
| Declination | +34° 07′ 50.728″[1] |
| Apparent magnitude (V) | 5.73[2] |
| Characteristics | |
| Spectral type | B8 V[2] |
| B−V color index | −0.054±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | +8.5±3.5[3] km/s |
| Proper motion (μ) | RA: +21.092 [1] mas/yr Dec.: −34.137 [1] mas/yr |
| Parallax (π) | 8.50 ± 0.38 mas[4] |
| Distance | 380 ± 20 ly (118 ± 5 pc) |
| Absolute magnitude (MV) | −0.39[5] |
| Details | |
| Mass | 3.44±0.07[6] M☉ |
| Radius | 3.0[7] R☉ |
| Luminosity | 193+24 −21[6] L☉ |
| Temperature | 12,246±85[6] K |
| Rotational velocity (v sin i) | 288[6] km/s |
| Age | 197[5] Myr |
| Other designations | |
55 Per, BD+33° 853, HD 27777, HIP 20579, HR 1377, SAO 57212[8] | |
| Database references | |
| SIMBAD | data |
55 Persei is a single,[9] 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.[2] Based upon an annual parallax shiftof8.50±0.38 mas[4] 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[5] due to interstellar dust.
This is a B-type main-sequence star with a stellar classification of B8 V;[2] a massive star that is generating energy through hydrogen fusion at its core. It has 3.44[6] times the mass of the Sun and about 3[7] times the Sun's radius. The star is about 197[5] million years old and is spinning rapidly with a projected rotational velocity of 288 km/s.[6] It is radiating roughly 193[6] times the Sun's luminosity from its photosphere at an effective temperature of 12,246 K.[6]
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