6 Persei
6 Persei is a binary star system in the northern constellation of Andromeda. It is faintly visible to the naked eye with an apparent visual magnitude of 5.29. The system is located 182 light years from Earth, as determined from its annual parallax shift of 17.9 mas. It is moving further away with a heliocentric radial velocity of +42 km/s. The system has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 0.386 arcsecond/year.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 02h 13m 36.34084s |
| Declination | +51° 03′ 56.8222″ |
| Apparent magnitude (V) | 5.29 |
| Characteristics | |
| Spectral type | G8.5 IIIb Fe-2 |
| B−V color index | 0.926 |
| Astrometry | |
| Radial velocity (Rv) | +41.82±0.27 km/s |
| Proper motion (μ) | RA: +344.397 mas/yr Dec.: −164.853 mas/yr |
| Parallax (π) | 17.8901 ± 0.0943 mas |
| Distance | 182.3 ± 1.0 ly (55.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.25±0.07 |
| Orbit | |
| Period (P) | 1,576.23±0.04 d |
| Eccentricity (e) | 0.8828±0.0007 |
| Inclination (i) | 104° |
| Periastron epoch (T) | 2,450,307.31±0.12 JD |
| Argument of periastron (ω) (secondary) | 266.4±0.3° |
| Semi-amplitude (K1) (primary) | 19.82±0.06 km/s |
| Details | |
| Mass | 1.5 M☉ |
| Radius | 7 R☉ |
| Luminosity | 26.3 L☉ |
| Surface gravity (log g) | 3.0 cgs |
| Temperature | 4,920 K |
| Metallicity [Fe/H] | −0.60 dex |
| Rotational velocity (v sin i) | 0.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a single-lined spectroscopic binary with an orbital period of 4.3155 yr and an eccentricity of 0.88. The a sin i value for the primary is 201.8±0.9 Gm, where a is the semimajor axis and i is the orbital inclination. The inclination is estimated to be 104°.
The visible component is an evolved giant star with a stellar classification of G8.5 IIIb Fe-2, where the suffix notation indicates an underabundance of iron in the spectrum. It has 1.5 times the mass of the Sun and has expanded to 7 times the Sun's radius. The star is radiating 26 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,920 K. It has a magnitude 10.49 visual companion at an angular separation of 108.9″ along a position angle of 57°, as of 2004.