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 |
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.
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