# Delta Muscae

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Star in the constellation Musca

Delta Muscae Location of δ Muscae (circled) Observation data Epoch J2000 Equinox J2000 Constellation Musca Right ascension 13h 02m 16.26474s[1] Declination −71° 32′ 55.8752″[1] Apparent magnitude (V) +3.61[2] Characteristics Spectral type K2III[3] U−B color index +1.26[2] B−V color index +1.18[2] Astrometry Radial velocity (Rv) 36.5±0.9[4] km/s Proper motion (μ) RA: 264.17[1] mas/yr Dec.: −22.75[1] mas/yr Parallax (π) 35.88±0.44 mas[1] Distance 91 ± 1 ly (27.9 ± 0.3 pc) Absolute magnitude (MV) +1.38[5] Orbit[6] Period (P) 423.2±0.10 d Semi-major axis (a) 12.1±0.35 mas Eccentricity (e) 0.52±0.06 Inclination (i) 120±2.3° Longitude of the node (Ω) 58±2.7° Periastron epoch (T) 25,945±5.5 JD Argument of periastron (ω) (secondary) 319±4.2° Semi-amplitude (K1) (primary) 8.8±0.38 km/s Details[6] A Mass 1.5 M☉ Radius 8.6 R☉ Luminosity 31 L☉ Surface gravity (log g) 2.5 cgs Temperature 4,500 K B Mass 0.4 M☉ Other designations δ Mus, CD−70°997, FK5 487, GC 17672, HD 112985, HIP 63613, HR 4923, SAO 257000 Database references SIMBAD data

**Delta Muscae**, [Latinized](/source/Latinisation_of_names) from δ Muscae, often catalogued as **HD 112985**, is a [spectroscopic binary](/source/Spectroscopic_binary) star system in the [southern](/source/Southern_Hemisphere) [constellation](/source/Constellation) of [Musca](/source/Musca_(constellation)) (the [Fly](/source/Fly)), at a distance of approximately 27.8 [parsecs](/source/Parsec) (91.0 [light years](/source/Light_year)). The main star is classified as a [giant star](/source/Giant_star) with an orange tint. It is one of the stars given a [Bayer designation](/source/Bayer_designation) by astronomer [Johann Bayer](/source/Johann_Bayer). It was recorded in Bayer's 1603 publication *[Uranometria](/source/Uranometria)*. In addition it is one of the main stars used in the visual formation of the Musca constellation.

## Distance and visibility

Based on research done by the [European Space Agency](/source/European_Space_Agency) for the [Hipparcos Star Catalogue](/source/Hipparcos_catalogue), Delta Muscae exhibits a [parallax](/source/Parallax) of 35.91 [milliarcseconds](/source/Milliarcseconds).[7] With this data, it can be calculated that Delta Muscae is situated at a distance of 27.8 [parsecs](/source/Parsec), or 91.0 [light years](/source/Light_year), from the sun.

Even though Delta Muscae is the closest star to Earth in the Musca constellation excluding the [white dwarf](/source/White_dwarf) [Gliese 440](/source/Gliese_440), nearly 3800 stars are closer in proximity to the Earth as stated by the [Gliese Catalogue of Nearby Stars](/source/Gliese_Catalogue_of_Nearby_Stars), which includes stars within twenty-five parsecs of the Sun.[8]

Delta Muscae is a star of the third [magnitude](/source/Apparent_magnitude) (or 3.61(v) to be exact) when viewed from the [Earth](/source/Earth), and is visible to the [naked eye](/source/Naked_eye) in regions that lack dense [light pollution](/source/Light_pollution).[7]

## Stellar and system characteristics

Delta Muscae has a listed [spectral type](/source/Stellar_classification) of K2III.[9] The K2 portion of this designation specifies that Delta Muscae A is a class K2 star, meaning the light it emits is orange in color. The main star burns at a temperature cooler than the [Sun](/source/Sun), which is a G2 star. The second part of the classification, III, specifies that Delta Muscae is a [giant star](/source/Giant_star) which has already left the [main sequence](/source/Main_sequence) of star life like the Sun.

## References

1. ^ [***a***](#cite_ref-HIP_1-0) [***b***](#cite_ref-HIP_1-1) [***c***](#cite_ref-HIP_1-2) [***d***](#cite_ref-HIP_1-3) [***e***](#cite_ref-HIP_1-4) van Leeuwen, F.; et al. (2007). ["Validation of the new Hipparcos reduction"](http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL). *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-UBV_2-0) [***b***](#cite_ref-UBV_2-1) [***c***](#cite_ref-UBV_2-2) Cousins, A. W. J.; Stoy, R. H. (1962). "Photoelectric magnitudes and colours of Southern stars". *Royal Observatory Bulletin*. **64** (64). [SIMBAD](/source/SIMBAD): 103. [Bibcode](/source/Bibcode_(identifier)):[1962RGOB...64..103C](https://ui.adsabs.harvard.edu/abs/1962RGOB...64..103C).

1. **[^](#cite_ref-Gray_3-0)** Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". *The Astronomical Journal*. **132** (1): 161–170. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0603770](https://arxiv.org/abs/astro-ph/0603770). [Bibcode](/source/Bibcode_(identifier)):[2006AJ....132..161G](https://ui.adsabs.harvard.edu/abs/2006AJ....132..161G). [doi](/source/Doi_(identifier)):[10.1086/504637](https://doi.org/10.1086%2F504637). [S2CID](/source/S2CID_(identifier)) [119476992](https://api.semanticscholar.org/CorpusID:119476992).

1. **[^](#cite_ref-RV_4-0)** Evans, D. S. (2006). "The Revision of the General Catalogue of Radial Velocities". *Determination of Radial Velocities and Their Applications*. **30**: 57. [Bibcode](/source/Bibcode_(identifier)):[1967IAUS...30...57E](https://ui.adsabs.harvard.edu/abs/1967IAUS...30...57E).

1. **[^](#cite_ref-Anderson2012_5-0)** Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*, **38** (5): 331, [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971), [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A), [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015), [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-pourbaix2018_6-0) [***b***](#cite_ref-pourbaix2018_6-1) Pourbaix, Dimitri; Boffin, Henri M. J. (2018). "δ Mus Revisited: Rectifying a 82 yr-old Mistake". *Revista Mexicana de Astronomía y Astrofísica*. **54**: 355. [arXiv](/source/ArXiv_(identifier)):[1806.01370](https://arxiv.org/abs/1806.01370). [Bibcode](/source/Bibcode_(identifier)):[2018RMxAA..54..355P](https://ui.adsabs.harvard.edu/abs/2018RMxAA..54..355P).

1. ^ [***a***](#cite_ref-hip_7-0) [***b***](#cite_ref-hip_7-1) ["HIP 63613"](http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HIP%2063613). *The Hipparcos and Tycho Catalogues*. [ESA](/source/ESA). 1997. Retrieved 16 December 2008.

1. **[^](#cite_ref-8)** ["Gliese Catalogue of Nearby Stars"](http://webviz.u-strasbg.fr/viz-bin/VizieR-3?-to=2&-meta=1u&-source=V%2F70A%2Fcatalog). *Preliminary Version of the Third Catalogue of Nearby Stars*. Gliese et al. 1991. Retrieved 16 December 2008.

1. **[^](#cite_ref-SIMBAD_9-0)** ["* del Mus"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+del+Mus). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 16 December 2008.

## External links

- [NASA Exoplanet Archive results: HD 112985](http://exoplanetarchive.ipac.caltech.edu/cgi-bin/Sieve/nph-sieve?&objstr=HD+112985)[*[permanent dead link](https://en.wikipedia.org/wiki/Wikipedia:Link_rot)*]

- [Del Mus Image](http://aladin.u-strasbg.fr/AladinPreview?-c=13+02+16.2633-71+32+55.879&ident=HD+112985&submit=Aladin+previewer)

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 [Delta Muscae](https://en.wikipedia.org/wiki/Delta_Muscae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Delta_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.