Epoch J2000.0 Equinox J2000.0
|Right ascension||11h 45m 36.419s|
|Declination||−66° 43′ 43.55″|
|Apparent magnitude (V)||+3.68|
|U−B color index||0.50|
|B−V color index||0.162|
|R−I color index||0.08|
|Radial velocity (Rv)||16.3 km/s|
|Proper motion (μ)||RA: −100.42 mas/yr
Dec.: 33.21 mas/yr
|Parallax (π)||25.42 ± 0.54 mas|
|Distance||128 ± 3 ly
(39.3 ± 0.8 pc)
|Absolute magnitude (MV)||0.66|
Lambda Muscae (λ Mus, λ Muscae), often catalogued HD 102249 or HIP 57363, is 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 a star in a dual system according to studies, and one of the stars catalogued in astronomer Johann Bayer's 1603 publications Uranometria. Lambda Muscae more recently has been recorded as having a stellar classification of A7III. Thus, Lambda Muscae has a white tint and burns significantly hotter than our own sun.
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. 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 the farthest right star in the visual constellation of Musca and is thus the tail of the fly.
Lambda Muscae has a listed spectral type of A7III. The A7 portion of this designation that Lambda Muscae is a class A7 star, meaning the light it emits is bluish-white in color and burns at a temperature significantly hotter than our own sun (Sol), 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 second part of the classification, III, specifies that Lambda Muscae is a giant star which has yet to reach the main sequence of star life like the sun.