Gamma Muscae

γ Muscae
Location of γ Muscae (circled)
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]
Distance325 ± 4 ly
(100 ± 1 pc)
Absolute magnitude (MV)−1.1[5]
Details
Mass5.09[6] M☉
Radius4.17[6] R☉
Luminosity790[5] L☉
Surface gravity (log g)3.87[6] cgs
Temperature15,490[6] K
Rotational velocity (v sin i)205[3] km/s
Age67.7[6] Myr
Other designations
β Vol, CD−70°997, FK5 487, GC 17672, HD 109026, HIP 61199, HR 4773, SAO 257000
Database references
SIMBADdata

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.

A light curve for Gamma Muscae, plotted from TESS data[7]

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]

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference aaa216_1_44 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Glagolevskij2019 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference AAVSOgam was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference MolendaZakowicz2004 was invoked but never defined (see the help page).