Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 03h 42m 22.64555s [1] |
Declination | 33° 57′ 54.0893″ [1] |
Apparent magnitude (V) | 4.97 [2] |
Characteristics | |
Spectral type | B0.5V [3] + A1Vn [4] |
U−B color index | −0.84 [5] |
B−V color index | +0.00 [5] |
Astrometry | |
Radial velocity (Rv) | +22.00 [6] km/s |
Proper motion (μ) |
RA: +2.71
[1]
mas/
yr Dec.: −5.91 [1] mas/ yr |
Parallax (π) | 3.09 ± 0.21 mas [1] |
Distance | 1,060 ± 70
ly (320 ± 20 pc) |
Absolute magnitude (MV) | −2.26 [2] |
Details | |
40 Per A | |
Mass | 12.5 [7] M☉ |
Luminosity | 936 [2] L☉ |
Surface gravity (log g) | 4.36 [8] cgs |
Temperature | 29,330 [9] K |
Metallicity [Fe/H] | −0.43 [2] dex |
Rotational velocity (v sin i) | 10 [10] km/s |
Age | 7.2 [11] Myr |
Other designations | |
Database references | |
SIMBAD | data |
40 Persei is a wide binary star [13] system in the northern constellation of Perseus. It has the Bayer designation ο Persei, while 40 Persei is the Flamsteed designation. The system is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.97. [2] It is located approximately 1060 light years away from the Sun based on parallax, [1] and is drifting further away with a radial velocity of +22 km/s. [6] The system is a member of the Perseus OB2 association of co-moving stars. [14]
The primary component is a massive B-type main-sequence star with a stellar classification of B0.5V. [3] It is about 7.2 [11] million years old and has a very low projected rotational velocity for an early B-type star, [15] measured at 10 km/s. [10] This star has 12.5 [7] times the mass of the Sun and is radiating 936 [2] times the Sun's luminosity from its photosphere at an effective temperature of 29,330 K. [9] The companion is magnitude 10.04, A-type main-sequence star with a class of A1Vn, and is located at an angular separation of 19.8 ″ from the primary. [4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 03h 42m 22.64555s [1] |
Declination | 33° 57′ 54.0893″ [1] |
Apparent magnitude (V) | 4.97 [2] |
Characteristics | |
Spectral type | B0.5V [3] + A1Vn [4] |
U−B color index | −0.84 [5] |
B−V color index | +0.00 [5] |
Astrometry | |
Radial velocity (Rv) | +22.00 [6] km/s |
Proper motion (μ) |
RA: +2.71
[1]
mas/
yr Dec.: −5.91 [1] mas/ yr |
Parallax (π) | 3.09 ± 0.21 mas [1] |
Distance | 1,060 ± 70
ly (320 ± 20 pc) |
Absolute magnitude (MV) | −2.26 [2] |
Details | |
40 Per A | |
Mass | 12.5 [7] M☉ |
Luminosity | 936 [2] L☉ |
Surface gravity (log g) | 4.36 [8] cgs |
Temperature | 29,330 [9] K |
Metallicity [Fe/H] | −0.43 [2] dex |
Rotational velocity (v sin i) | 10 [10] km/s |
Age | 7.2 [11] Myr |
Other designations | |
Database references | |
SIMBAD | data |
40 Persei is a wide binary star [13] system in the northern constellation of Perseus. It has the Bayer designation ο Persei, while 40 Persei is the Flamsteed designation. The system is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.97. [2] It is located approximately 1060 light years away from the Sun based on parallax, [1] and is drifting further away with a radial velocity of +22 km/s. [6] The system is a member of the Perseus OB2 association of co-moving stars. [14]
The primary component is a massive B-type main-sequence star with a stellar classification of B0.5V. [3] It is about 7.2 [11] million years old and has a very low projected rotational velocity for an early B-type star, [15] measured at 10 km/s. [10] This star has 12.5 [7] times the mass of the Sun and is radiating 936 [2] times the Sun's luminosity from its photosphere at an effective temperature of 29,330 K. [9] The companion is magnitude 10.04, A-type main-sequence star with a class of A1Vn, and is located at an angular separation of 19.8 ″ from the primary. [4]