Atlas (star)
Triple star system in the constellation Taurus / From Wikipedia, the free encyclopedia
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Atlas /ˈætləs/,[12] designation 27 Tauri, is a triple star system in the constellation of Taurus. It is a member of the Pleiades, an open star cluster (M45). It is 431 light-years (132 parsecs) away,[8] and is 3.92 degrees north of the ecliptic.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Taurus |
Right ascension | 03h 49m 09.74258s[1] |
Declination | +24° 03′ 12.3003″[1] |
Apparent magnitude (V) | 3.63[2] (3.84 / 5.46)[3] |
Characteristics | |
Spectral type | B8III[4] |
U−B color index | −0.36[5] |
B−V color index | −0.08[5] |
Variable type | SPB[6] |
Astrometry | |
Radial velocity (Rv) | 8.5±2[7] km/s |
Proper motion (μ) | RA: +17.70[1] mas/yr Dec.: −44.18[1] mas/yr |
Parallax (π) | 8.53 ± 0.39 mas[1] |
Distance | 431 ± 13 ly (132±4[8] pc) |
Absolute magnitude (MV) | −1.82[9] |
Orbit[8] | |
Primary | Aa1 |
Companion | Aa2 |
Period (P) | 290.984±0.079 d |
Semi-major axis (a) | 13.08±0.12 mas |
Eccentricity (e) | 0.2385±0.0063 |
Inclination (i) | 107.87±0.49° |
Longitude of the node (Ω) | 154.0±0.7° |
Periastron epoch (T) | JD 2450583.0±1.9 |
Argument of periastron (ω) (secondary) | 151.9±2.2° |
Semi-amplitude (K1) (primary) | 26.55±1.41 km/s |
Semi-amplitude (K2) (secondary) | 36.89±0.22 km/s |
Details | |
Aa1 | |
Mass | 4.74±0.25[8] M☉ |
Radius | 7.9[10] R☉ |
Surface gravity (log g) | 3.32±0.09[10] cgs |
Temperature | 13,446±218[4] K |
Rotational velocity (v sin i) | 280[4] km/s |
Aa2 | |
Mass | 3.42±0.25[8] M☉ |
Radius | 3.2[10] R☉ |
Surface gravity (log g) | 3.96±0.09[10] cgs |
Temperature | 13,660[10] K |
Ab | |
Mass | 2.09[11] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
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