Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 01h 52m 09.3723s [1] |
Declination | +50° 47′ 34.054″ [1] |
Apparent magnitude (V) | 5.70 [2] |
Characteristics | |
Spectral type | B9pHgMn [3] |
B−V color index | −0.067±0.004 [2] |
Astrometry | |
Radial velocity (Rv) | 11.4±0.2 [4] km/s |
Proper motion (μ) |
RA: +17.532
[1]
mas/
yr Dec.: −29.090 [1] mas/ yr |
Parallax (π) | 6.8219 ± 0.1092 mas [1] |
Distance | 478 ± 8
ly (147 ± 2 pc) |
Absolute magnitude (MV) | −0.14 [2] |
Orbit [4] | |
Primary | 2 Persei A |
Companion | 2 Persei B |
Period (P) | 5.62698±0.00002 d |
Eccentricity (e) | 0.024±0.011 |
Periastron epoch (T) | 2440281.3±0.4 JD |
Argument of periastron (ω) (primary) | 208±24° |
Semi-amplitude (K1) (primary) | 26.5±0.3 km/s |
Details | |
Mass | 3.2 [1] M☉ |
Radius | 3.7 [1] R☉ |
Luminosity | 156 [1] L☉ |
Surface gravity (log g) | 3.74 [1] cgs |
Temperature | 11,218 [1] K |
Metallicity [Fe/H] | −0.74 [1] dex |
Rotational velocity (v sin i) | 25 [5] km/s |
Age | 233 [1] Myr |
Other designations | |
Database references | |
SIMBAD | data |
2 Persei is a binary star system in the northern constellation Perseus, located around 500 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude is 5.70. [2] The system is moving further away from the Earth with a heliocentric radial velocity of 11 km/s. [4]
In 1970 radial velocity measurements from spectrograms taken at David Dunlap Observatory indicated it was a single-lined spectroscopic binary. [7] [5] Follow up observations led to the determination that it had a nearly circular orbit with a period of 5.6 days. [4] The visible component is a chemically peculiar mercury-manganese star with a stellar classification of B9pHgMn. [3] Other analyses of its spectrum have assigned it the giant star spectral type of B9III. [8]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 01h 52m 09.3723s [1] |
Declination | +50° 47′ 34.054″ [1] |
Apparent magnitude (V) | 5.70 [2] |
Characteristics | |
Spectral type | B9pHgMn [3] |
B−V color index | −0.067±0.004 [2] |
Astrometry | |
Radial velocity (Rv) | 11.4±0.2 [4] km/s |
Proper motion (μ) |
RA: +17.532
[1]
mas/
yr Dec.: −29.090 [1] mas/ yr |
Parallax (π) | 6.8219 ± 0.1092 mas [1] |
Distance | 478 ± 8
ly (147 ± 2 pc) |
Absolute magnitude (MV) | −0.14 [2] |
Orbit [4] | |
Primary | 2 Persei A |
Companion | 2 Persei B |
Period (P) | 5.62698±0.00002 d |
Eccentricity (e) | 0.024±0.011 |
Periastron epoch (T) | 2440281.3±0.4 JD |
Argument of periastron (ω) (primary) | 208±24° |
Semi-amplitude (K1) (primary) | 26.5±0.3 km/s |
Details | |
Mass | 3.2 [1] M☉ |
Radius | 3.7 [1] R☉ |
Luminosity | 156 [1] L☉ |
Surface gravity (log g) | 3.74 [1] cgs |
Temperature | 11,218 [1] K |
Metallicity [Fe/H] | −0.74 [1] dex |
Rotational velocity (v sin i) | 25 [5] km/s |
Age | 233 [1] Myr |
Other designations | |
Database references | |
SIMBAD | data |
2 Persei is a binary star system in the northern constellation Perseus, located around 500 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude is 5.70. [2] The system is moving further away from the Earth with a heliocentric radial velocity of 11 km/s. [4]
In 1970 radial velocity measurements from spectrograms taken at David Dunlap Observatory indicated it was a single-lined spectroscopic binary. [7] [5] Follow up observations led to the determination that it had a nearly circular orbit with a period of 5.6 days. [4] The visible component is a chemically peculiar mercury-manganese star with a stellar classification of B9pHgMn. [3] Other analyses of its spectrum have assigned it the giant star spectral type of B9III. [8]