Delta Muscae

{{Short description|Star in the constellation Musca}}

{{Starbox begin}}

{{Use dmy dates|date=February 2024}}

{{Starbox image

| image =

{{Location mark

| image=Musca constellation map.png

| float=center | width=250 | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=δ Mus

| x%=41.9 | y%=58.8

}}

| caption = Location of δ Muscae (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Musca

| ra = {{RA|13|02|16.26474}}{{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author1=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid = 18759600}}

| dec = {{DEC|-71|32|55.8752}}

| appmag_v = +3.61{{cite journal|title=Photoelectric magnitudes and colours of Southern stars|author1=Cousins, A. W. J.|author2=Stoy, R. H.|journal=Royal Observatory Bulletin|volume=64|number=64|date=1962|page=103 |publisher=SIMBAD|bibcode=1962RGOB...64..103C}}

}}

{{Starbox character

| class = K2III{{cite journal|doi=10.1086/504637|title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample|journal=The Astronomical Journal|volume=132|pages=161–170|year=2006|last1=Gray|first1=R. O.|last2=Corbally|first2=C. J.|last3=Garrison|first3=R. F.|last4=McFadden|first4=M. T.|last5=Bubar|first5=E. J.|last6=McGahee|first6=C. E.|last7=O'Donoghue|first7=A. A.|last8=Knox|first8=E. R.|issue=1 |arxiv = astro-ph/0603770 |bibcode = 2006AJ....132..161G |s2cid=119476992}}

| b-v = +1.18

| u-b = +1.26

| variable =

|arxiv = astro-ph/0603770 |bibcode = 2006AJ....132..161G }}

{{Starbox astrometry

| radial_v = {{val|36.5|0.9}}{{cite journal|title=The Revision of the General Catalogue of Radial Velocities|journal=Determination of Radial Velocities and Their Applications|volume=30|pages=57|author=Evans, D. S.|date=2006|bibcode=1967IAUS...30...57E}}

| prop_mo_ra = 264.17

| prop_mo_dec = −22.75

| parallax = 35.88

| p_error = 0.44

| parallax_footnote =

| absmag_v = +1.38{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

}}

{{Starbox orbit

| reference = {{cite journal |bibcode=2018RMxAA..54..355P |title=δ Mus Revisited: Rectifying a 82 yr-old Mistake |last1=Pourbaix |first1=Dimitri |last2=Boffin |first2=Henri M. J. |journal=Revista Mexicana de Astronomía y Astrofísica |date=2018 |volume=54 |page=355 |arxiv=1806.01370 }}

| period_unitless = {{val|423.2|0.10|u=days}}

| axis_unitless = {{val|12.1|0.35|ul=mas}}

| inclination = {{val|120|2.3}}

| node = {{val|58|2.7}}

| periastron = {{val|25945|5.5|ul=JD|fmt=commas}}

| eccentricity = {{val|0.52|0.06}}

| periarg = {{val|319|4.2}}

| k1 = {{val|8.8|0.38}}

}}

{{Starbox detail

| source =

| component1 = A

| mass = 1.5

| radius = 8.6

| luminosity = 31

| temperature = 4,500

| gravity = 2.5

| metal_fe =

| rotational_velocity =

| age_myr =

| component2 = B

| mass2 = 0.4

|

}}

{{Starbox catalog

| names = {{odlist | B=δ Mus | CD=−70°997 | FK5=487 | GC=17672 | HD=112985 | HIP=63613 | HR=4923 | SAO=257000 }}

}}

{{Starbox reference

| Simbad = HD+112985

}}

{{Starbox end}}

Delta Muscae, Latinized from δ Muscae, often catalogued as HD 112985, is a spectroscopic binary star system and the closest to the Earth in the southern hemisphere constellation of Musca (the Fly) at a distance of approximately 27.8 parsecs (91.0 light years). The main star is classified as a giant star with an orange tint. It is one of the stars given a Bayer designation by astronomer Johann Bayer. It was recorded in Bayer's 1603 publication Uranometria. In addition it is one of the main stars used in the visual formation of the Musca constellation.