# Gamma Muscae

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Star in the constellation Musca

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 Evolutionary stage main sequence[3][4] Spectral type B5 V[5] 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[6] 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[7] Details Mass 5.09[8] M☉ Radius 4.17[8] R☉ Luminosity 790[7] L☉ Surface gravity (log g) 3.87[8] cgs Temperature 15,490[8] K Rotational velocity (v sin i) 205[5] km/s Age 67.7[8] Myr Other designations γ Mus, CD−70°997, FK5 487, GC 17672, HD 109026, HIP 61199, HR 4773, SAO 257000 Database references SIMBAD data

**γ Muscae**, [Latinised](/source/Romanization_of_Greek) as **Gamma Muscae**, is a blue-white hued [star](/source/Star) in the southern [circumpolar constellation](/source/Circumpolar_constellation) of [Musca](/source/Musca), the [Fly](/source/Fly). It can be seen with the naked eye, having an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 3.87.[2] Based upon an annual [parallax shift](/source/Stellar_parallax) of 10.04 [mas](/source/Milliarcsecond) as seen from Earth, it is located about 325 [light years](/source/Light_year) from the [Sun](/source/Sun).

A [light curve](/source/Light_curve) for Gamma Muscae, plotted from *[TESS](/source/Transiting_Exoplanet_Survey_Satellite)* data[9]

This is a [B-type main-sequence star](/source/B-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of B5 V.[5] It is a [variable star](/source/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](/source/Slowly_pulsating_B_star).[10] It is around five times as massive as the [Sun](/source/Sun).[11] The star is spinning rapidly with a [projected rotational velocity](/source/Projected_rotational_velocity) of 205 km/s. This is giving it an [oblate](/source/Oblate_spheroid) shape with an [equatorial bulge](/source/Equatorial_bulge) that is 7% larger than the polar radius.[5]

Gamma Muscae is a [proper motion](/source/Proper_motion) member of the Lower Centaurus–Crux sub-group in the [Scorpius–Centaurus](/source/Scorpius%E2%80%93Centaurus_association) [OB association](/source/Stellar_association), the nearest such association of co-moving massive stars to the Sun.[7]

## References

1. ^ [***a***](#cite_ref-aaa474_2_653_1-0) [***b***](#cite_ref-aaa474_2_653_1-1) [***c***](#cite_ref-aaa474_2_653_1-2) [***d***](#cite_ref-aaa474_2_653_1-3) [***e***](#cite_ref-aaa474_2_653_1-4) [***f***](#cite_ref-aaa474_2_653_1-5) van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", *Astronomy and Astrophysics*, **474** (2): 653–664, [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752), [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357), [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. ^ [***a***](#cite_ref-clpl4_99_2-0) [***b***](#cite_ref-clpl4_99_2-1) [***c***](#cite_ref-clpl4_99_2-2) [***d***](#cite_ref-clpl4_99_2-3) [***e***](#cite_ref-clpl4_99_2-4) Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", *Communications of the Lunar and Planetary Laboratory*, **4** (99): 99, [Bibcode](/source/Bibcode_(identifier)):[1966CoLPL...4...99J](https://ui.adsabs.harvard.edu/abs/1966CoLPL...4...99J).

1. ^ [***a***](#cite_ref-romanvuk2012_3-0) [***b***](#cite_ref-romanvuk2012_3-1) Romanyuk, I. I.; Yakunin, I. A. (2012). "Magnetic B-type stars of the main sequence. I. Problem formulation and selection of objects for observations". *Astrophysical Bulletin*. **67** (2): 177. [Bibcode](/source/Bibcode_(identifier)):[2012AstBu..67..177R](https://ui.adsabs.harvard.edu/abs/2012AstBu..67..177R). [doi](/source/Doi_(identifier)):[10.1134/S1990341312020058](https://doi.org/10.1134%2FS1990341312020058).

1. ^ [***a***](#cite_ref-dr3_4-0) [***b***](#cite_ref-dr3_4-1) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D5842864786417716608%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-vanBelle2012_5-0) [***b***](#cite_ref-vanBelle2012_5-1) [***c***](#cite_ref-vanBelle2012_5-2) [***d***](#cite_ref-vanBelle2012_5-3) [***e***](#cite_ref-vanBelle2012_5-4) van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", *The Astronomy and Astrophysics Review*, **20** (1): 51, [arXiv](/source/ArXiv_(identifier)):[1204.2572](https://arxiv.org/abs/1204.2572), [Bibcode](/source/Bibcode_(identifier)):[2012A&ARv..20...51V](https://ui.adsabs.harvard.edu/abs/2012A&ARv..20...51V), [doi](/source/Doi_(identifier)):[10.1007/s00159-012-0051-2](https://doi.org/10.1007%2Fs00159-012-0051-2), [S2CID](/source/S2CID_(identifier)) [119273474](https://api.semanticscholar.org/CorpusID:119273474).

1. ^ [***a***](#cite_ref-Gontcharov2006_6-0) [***b***](#cite_ref-Gontcharov2006_6-1) Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", *Astronomy Letters*, **32** (11): 759–771, [arXiv](/source/ArXiv_(identifier)):[1606.08053](https://arxiv.org/abs/1606.08053), [Bibcode](/source/Bibcode_(identifier)):[2006AstL...32..759G](https://ui.adsabs.harvard.edu/abs/2006AstL...32..759G), [doi](/source/Doi_(identifier)):[10.1134/S1063773706110065](https://doi.org/10.1134%2FS1063773706110065), [S2CID](/source/S2CID_(identifier)) [119231169](https://api.semanticscholar.org/CorpusID:119231169).

1. ^ [***a***](#cite_ref-aaa216_1_44_7-0) [***b***](#cite_ref-aaa216_1_44_7-1) [***c***](#cite_ref-aaa216_1_44_7-2) [***d***](#cite_ref-aaa216_1_44_7-3) de Geus, E. J.; et al. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", *Astronomy and Astrophysics*, **216** (1–2): 44–61, [Bibcode](/source/Bibcode_(identifier)):[1989A&A...216...44D](https://ui.adsabs.harvard.edu/abs/1989A&A...216...44D).

1. ^ [***a***](#cite_ref-Glagolevskij2019_8-0) [***b***](#cite_ref-Glagolevskij2019_8-1) [***c***](#cite_ref-Glagolevskij2019_8-2) [***d***](#cite_ref-Glagolevskij2019_8-3) [***e***](#cite_ref-Glagolevskij2019_8-4) [***f***](#cite_ref-Glagolevskij2019_8-5) Glagolevskij, Yu. V. (January 2019), "On Properties of Main Sequence Magnetic Stars", *Astrophysical Bulletin*, **74** (1): 66–79, [Bibcode](/source/Bibcode_(identifier)):[2019AstBu..74...66G](https://ui.adsabs.harvard.edu/abs/2019AstBu..74...66G), [doi](/source/Doi_(identifier)):[10.1134/S1990341319010073](https://doi.org/10.1134%2FS1990341319010073), [S2CID](/source/S2CID_(identifier)) [255384587](https://api.semanticscholar.org/CorpusID:255384587).

1. ^ [***a***](#cite_ref-MAST_9-0) [***b***](#cite_ref-MAST_9-1) [*MAST: Barbara A. Mikulski Archive for Space Telescopes*](https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html), Space Telescope Science Institute, retrieved 23 September 2022.

1. ^ [***a***](#cite_ref-AAVSOgam_10-0) [***b***](#cite_ref-AAVSOgam_10-1) BSJ (5 March 2012), ["Gamma Muscae"](http://www.aavso.org/vsx/index.php?view=detail.top&oid=19956), *AAVSO Website*, [American Association of Variable Star Observers](/source/American_Association_of_Variable_Star_Observers), retrieved 21 December 2013.

1. ^ [***a***](#cite_ref-MolendaZakowicz2004_11-0) [***b***](#cite_ref-MolendaZakowicz2004_11-1) Molenda-Zakowicz, J.; Połubek, G. (2004), "Empirical absolute magnitudes, luminosities and effective temperatures of SPB variables and the problem of variability classification of monoperiodic stars", *Acta Astronomica*, **54**: 281–97 [283], [Bibcode](/source/Bibcode_(identifier)):[2004AcA....54..281M](https://ui.adsabs.harvard.edu/abs/2004AcA....54..281M).

v t e Constellation of Musca List of stars in Musca Musca in Chinese astronomy Stars Bayer α β γ δ ε ζ1 ζ2 η θ ι1 ι2 λ μ λ Cha Variable R S SY TU GQ GR GU GT KR MP V357 HR 4538 4549 5002 HD 111232 112410 Other Gliese 440 PSR J1141−6545 YSES 1 YSES 2 YSES 2b Exoplanets HD 111232 b Star clusters NGC 4372 NGC 4463 NGC 4815 NGC 4833 Nebulae NGC 5189 Other BHR 71 Dark Doodad Nebula Engraved Hourglass Nebula G299.2-2.9 Category

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Adapted from the Wikipedia article [Gamma Muscae](https://en.wikipedia.org/wiki/Gamma_Muscae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Gamma_Muscae?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.