Lambda Muscae

Lambda Muscae

Template:Location mark Location of λ Muscae (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Musca
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	+3.63
Characteristics
Spectral type	A7 V
U−B Template:Engvar	+0.14
B−V Template:Engvar	+0.16
R−I Template:Engvar	0.08
Variable type	δ Sct
Astrometry
Radial velocity (Rv)	km/s
Proper motion (μ)	RA: −100.35 mas/yr Dec.: +33.49 mas/yr
Parallax (π)	25.65±0.34 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	+1.07
Details
Aa
Mass	2.28 Template:Solar mass
Radius	3.7 Template:Solar radius
Luminosity	40 Template:Solar luminosity
Surface gravity (log g)	3.87 cgs
Temperature	7,700 K
Rotational velocity (v sin i)	km/s
Age	700 Myr
Ab
Mass	0.43 Template:Solar mass
Metallicity [Fe/H]	{{{metal_fe2}}} dex
C
Mass	0.16 Template:Solar mass
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBAD	data

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. 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. 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.