6 Persei
Star in the constellation Andromeda
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6 Persei is a binary star[8] system in the northern constellation of Andromeda.[9] It is faintly visible to the naked eye with an apparent visual magnitude of 5.29.[3] The system is located 182 light years from Earth, as determined from its annual parallax shift of 17.9 mas.[2] It is moving further away with a heliocentric radial velocity of +42 km/s.[5] The system has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 0.386 arcsecond/year.[10]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 02h 13m 36.34084s[2] |
| Declination | +51° 03′ 56.8222″[2] |
| Apparent magnitude (V) | 5.29[3] |
| Characteristics | |
| Spectral type | G8.5 IIIb Fe-2[3] |
| B−V color index | 0.926[4] |
| Astrometry | |
| Radial velocity (Rv) | +41.82±0.27[5] km/s |
| Proper motion (μ) | RA: +344.397[2] mas/yr Dec.: −164.853[2] mas/yr |
| Parallax (π) | 17.8901±0.0943 mas[2] |
| Distance | 182.3 ± 1.0 ly (55.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.25±0.07[6] |
| Orbit[6] | |
| 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[4] | |
| 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 | |
| NSV 747, AG+50°249, BD+50°481, FK5 77, HD 13530, HIP 10366, HR 645, SAO 23047, PPM 27263, WDS J02136+5104A[7] | |
| 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°.[6]
The visible component is an evolved giant star with a stellar classification of G8.5 IIIb Fe-2,[3] 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.[4] It has a magnitude 10.49 visual companion at an angular separation of 108.9″ along a position angle of 57°, as of 2004.[11]