58 Persei
Multiple-star system in the constellation of Perseus
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58 Persei is a binary[3] and possibly a triple[13] star system in the northern constellation of Perseus. It has the Bayer designation e Persei, while 58 Persei is the Flamsteed designation. This system is visible to the naked eye as a faint point of light with an apparent visual magnitude of 4.26.[2] It is approximately 800 light years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +10 km/s.[4]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 04h 36m 41.43017s[1] |
| Declination | +41° 15′ 53.3213″[1] |
| Apparent magnitude (V) | 4.26[2] |
| Characteristics | |
| Spectral type | K1II + B7V[3] |
| U−B color index | +0.81[2] |
| B−V color index | +1.24[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.80[4] km/s |
| Proper motion (μ) | RA: −4.56[1] mas/yr Dec.: −17.84[1] mas/yr |
| Parallax (π) | 4.09±0.38 mas[1] |
| Distance | 800 ± 70 ly (240 ± 20 pc) |
| Absolute magnitude (MV) | -2.67[5] |
| Orbit[6] | |
| Primary | 58 Persei A |
| Name | 58 Persei B |
| Period (P) | 28.8 yr |
| Semi-major axis (a) | 0.051″ |
| Eccentricity (e) | 0.64 |
| Inclination (i) | 81° |
| Longitude of the node (Ω) | 237° |
| Periastron epoch (T) | 1978.65 |
| Argument of periastron (ω) (secondary) | 191° |
| Details | |
| 58 Per A | |
| Mass | 6.8±0.2[7] M☉ |
| Radius | 86.7+4.6 −5.1[8] R☉ |
| Luminosity | 1,731±323[9] L☉ |
| Surface gravity (log g) | 2.21[10] cgs |
| Temperature | 4,500[9] K |
| Metallicity [Fe/H] | −0.20[5] dex |
| Rotational velocity (v sin i) | 11.0[11] km/s |
| Age | 50.1±6.8[7] Myr |
| Other designations | |
| Boss 1074, 58 Per, BD+40°1000, FK5 2338, GC 5609, HD 29094–95, HIP 21476, HR 1454, SAO 39639, CCDM J04367+4116A[12] | |
| Database references | |
| SIMBAD | data |
This is a single-lined spectroscopic binary system with an orbital period of 28.7 years and an eccentricity of 0.65.[14] The primary member, designated component A, is an orange-hued (K–type) bright giant with a stellar classification of K1II.[3] The star is around 50 million years old[7] with 6.8 times the mass of the Sun.[7] Having exhausted the supply of hydrogen at its core, it has expanded to roughly 87 times the Sun's radius.[8] It is radiating 1,731 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,500 K.[9]
The secondary, component B, appears to be a B-type main-sequence star with a stellar classification of B7V.[3] It is a suspected binary of unknown period with component masses of 3.3 and 1.2 times the mass of the Sun.[13]