Lambda Muscae

{{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=λ Mus

| x%=69.3 | y%=36.8

}}

| caption = Location of λ Muscae (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Musca

| ra = {{RA|11|45|36.41916}}

| dec = {{DEC|−66|43|43.5440}}

| appmag_v = +3.63

}}

{{Starbox character

| class = A7 V

| b-v = +0.16

| u-b = +0.14

| r-i = 0.08

| v-r =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+15.0|0.3}}

| prop_mo_ra = −100.35

| prop_mo_dec = +33.49

| parallax = 25.65

| p_error = 0.34

| parallax_footnote =

| absmag_v = +1.07

}}

{{Starbox detail

| source =

| component1 = Aa

| mass = 2.28

| radius = 3.7

| luminosity = 40

| temperature = 7,700

| gravity = 3.87

| metal_fe =

| rotational_velocity = {{Val|57.7|1.7}}

| age_myr = 700

| component2 = Ab

| mass2 = 0.43

}}

{{Starbox detail|no_heading=y

| component1 = C

| mass = 0.16

}}

{{Starbox catalog

| names = {{odlist | B=λ Mus | CCDM=J11456-6644A | CPD=−66° 1640 | FK5=442 | GC=16131 | HD=102249 | HIP=57363 | HR=4520 | SAO=251575 }}

}}

{{Starbox reference

| Simbad = HD+102249

| ARICNS =

}}

Lambda Muscae, Latinized from λ Muscae, and often catalogued HD 102249 or HIP 57363, is a triple star system and the fourth-brightest star in the Southern Hemisphere constellation of Musca (the Fly). Lambda Muscae visibly makes up the far end of the tail of the visual Musca constellation. It is one of the stars catalogued in astronomer Johann Bayer's 1603 publications Uranometria.

Distance and visibility

Based on research done by the European Space Agency for the Hipparcos Star Catalogue, Lambda Muscae exhibits a parallax of 25.42 milliarcseconds.{{cite web | url=http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HIP%2057363|work=The Hipparcos and Tycho Catalogues|publisher=ESA|year=1997|title=HIP 57363|accessdate=21 December 2008}} With this data it can be calculated that Lambda Muscae is situated at a distance of 39.3 parsecs, or 128.0 light years, away from the sun.

Lambda Muscae is a star of the third magnitude (or 3.68(v) to be exact) when viewed from the Earth, and is visible to the naked eye in regions that lack dense light pollution.

Lambda Muscae is the farthest right star in the visual constellation of Musca and is thus the tail of the fly.

Stellar characteristics

The primary component has a listed spectral type of A7V.{{cite simbad|title=* lam Mus |access-date=21 December 2008}} The A7 portion of this designation that Lambda Muscae Aa is a class A7 star, meaning the light it emits is bluish-white in color and burns at a temperature significantly hotter than the Sun, which is a G2 star. A7 stars are on the larger end of the Harvard spectral classification list, being only smaller and dimmer than Class-O and Class-B stars.

The other components of the system, the secondary and tertiary, are red dwarfs. They are separated by the primary by 1.65 and 6.4 astronomical units respectively.

References

{{reflist|refs=

{{Cite journal |last1=Waisberg |first1=Idel |last2=Klein |first2=Ygal |last3=Katz |first3=Boaz |date=2024-08-01 |title=Hidden Companions to Intermediate-mass Stars. XXII. Inferring a 0.43{{solar mass}}, 1.65 au Companion in the Astrometric Binary within the Triple System Lambda Muscae |bibcode=2024RNAAS...8..206W |journal=Research Notes of the American Astronomical Society |volume=8 |issue=8 |pages=206 |doi=10.3847/2515-5172/ad713a |doi-access=free |issn=2515-5172}}

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| journal=The Astrophysical Journal

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| arxiv=1501.03154 | s2cid=33401607 | postscript=. }}

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