Gamma Muscae
Star in the constellation Musca / From Wikipedia, the free encyclopedia
γ Muscae, Latinised as Gamma Muscae, is a blue-white hued star in the southern circumpolar constellation of Musca, the Fly. It can be seen with the naked eye, having an apparent visual magnitude of 3.87.[2] Based upon an annual parallax shift of 10.04 mas as seen from Earth, it is located about 325 light years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Musca |
Right ascension | 12h 32m 28.01343s[1] |
Declination | −72° 07′ 58.7597″[1] |
Apparent magnitude (V) | 3.87[2] |
Characteristics | |
Spectral type | B5 V[3] |
U−B color index | −0.61[2] |
B−V color index | −0.15[2] |
Variable type | SPB |
Astrometry | |
Radial velocity (Rv) | 2.5±7.4[4] km/s |
Proper motion (μ) | RA: −51.34[1] mas/yr Dec.: −5.40[1] mas/yr |
Parallax (π) | 10.04 ± 0.13 mas[1] |
Distance | 325 ± 4 ly (100 ± 1 pc) |
Absolute magnitude (MV) | −1.1[5] |
Details | |
Mass | 5.09[6] M☉ |
Radius | 4.17[6] R☉ |
Luminosity | 790[5] L☉ |
Surface gravity (log g) | 3.87[6] cgs |
Temperature | 15,490[6] K |
Rotational velocity (v sin i) | 205[3] km/s |
Age | 67.7[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is a B-type main-sequence star with a stellar classification of B5 V.[3] It is a variable star that ranges between magnitudes 3.84 and 3.86 over a period of 2.7 days, and is classed as a slowly pulsating B star.[8] It is around five times as massive as the Sun.[9] The star is spinning rapidly with a projected rotational velocity of 205 km/s. This is giving it an oblate shape with an equatorial bulge that is 7% larger than the polar radius.[3]
Gamma Muscae is a proper motion member of the Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun.[5]