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1 Persei
Star in the constellation Perseus / From Wikipedia, the free encyclopedia
1 Persei (1 Per) is an eclipsing binary[3] star in the constellation Perseus. Its uneclipsed apparent magnitude is 5.49. The binary star consists of two B2 type main-sequence stars in a 25.9 day eccentric orbit.[5] The stars are surrounded by a faint cloud of gas visible in mid-infrared, although whether they are the origin of the gas or simply passing through it is unclear.
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Perseus |
Right ascension | 01h 51m 59.32008s[1] |
Declination | +55° 08′ 50.5837″[1] |
Apparent magnitude (V) | 5.49 - 5.74 - 5.85[2] |
Characteristics | |
Spectral type | B1.5V[2] |
Variable type | eclipsing binary[3] |
Astrometry | |
Proper motion (μ) | RA: 12.716(74)[1] mas/yr Dec.: −8.410(79)[1] mas/yr |
Parallax (π) | 2.6944 ± 0.0888 mas[1] |
Distance | 1,210 ± 40 ly (370 ± 10 pc) |
Absolute magnitude (MV) | −1.37/−1.77[4] |
Orbit[4] | |
Primary | 1 Persei A |
Companion | 1 Persei B |
Period (P) | 25.935951±0.000003 d |
Eccentricity (e) | 0.3768±0.0014 |
Inclination (i) | 88.048±0.002° |
Periastron epoch (T) | 2443563.466±0.005 HJD |
Argument of periastron (ω) (secondary) | 109.83±0.10° |
Semi-amplitude (K1) (primary) | 97.4±0.1 km/s |
Semi-amplitude (K2) (secondary) | 91.2±0.1 km/s |
Details[4] | |
Primary | |
Mass | 6.95 M☉ |
Radius | 3.29 R☉ |
Luminosity | 2,188 L☉ |
Surface gravity (log g) | 4.25 cgs |
Temperature | 21,500 K |
Rotation | 1.45 days |
Rotational velocity (v sin i) | 115 km/s |
Secondary | |
Mass | 7.42 M☉ |
Radius | 3.86 R☉ |
Luminosity | 3,311 L☉ |
Surface gravity (log g) | 4.14 cgs |
Temperature | 22,000 K |
Rotation | 1.40 days |
Rotational velocity (v sin i) | 140 km/s |
Other designations | |
Database references | |
SIMBAD | data |
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