Theta Muscae
Star in the constellation Musca / From Wikipedia, the free encyclopedia
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Theta Muscae (θ Muscae) is a multiple star system in the southern constellation Musca ("the Fly"), containing a Wolf-Rayet star and two massive companions. With an apparent magnitude of 5.5, it is the second-brightest Wolf–Rayet star in the sky,[13] although much of the visual brightness comes from the massive companions and it is not one of the closest of its type.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Musca |
Right ascension | 13h 08m 07.15286s[1] |
Declination | −65° 18′ 21.6819″[1] |
Apparent magnitude (V) | 5.53[2] (5.662 + 7.555[3]) |
Characteristics | |
θ Mus A | |
Spectral type | WC5/6 + O6/7V + O9.5/B0Iab[4] |
U−B color index | −0.91[5] |
B−V color index | −0.43[3] |
Variable type | Eclipsing + WR[6] |
B | |
Spectral type | O9III[7] |
U−B color index | −0.90[5] |
B−V color index | −0.055[3] |
Astrometry | |
Radial velocity (Rv) | −28.4[8] km/s |
Proper motion (μ) | RA: −2.10[1] mas/yr Dec.: −11.52[1] mas/yr |
Parallax (π) | 0.26 ± 0.48 mas[1] |
Distance | 7,400[4] ly (2,270[4] pc) |
Absolute magnitude (MV) | −6.2[9] |
Orbit[10] | |
Period (P) | 19.1375 d |
Eccentricity (e) | 0.00 (assumed) |
Inclination (i) | 49±6° |
Semi-amplitude (K1) (primary) | 221±6 km/s |
Details | |
WR | |
Mass | <11.5[11] M☉ |
Luminosity | 234,000[11] L☉ |
O | |
Mass | 44[10] M☉ |
Luminosity | 295,000[12] L☉ |
Other designations | |
Database references | |
SIMBAD | data |
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