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LS Muscae, HD113120, HIP63688

LS Muscae is a blue eruptive giant star that can be located in the constellation of Musca. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

LS Muscae's Alternative Names

HIP63688 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD113120.

LS Muscae has alternative name(s) :- , LS Mus.

More details on star alternative names can be found at Star Names .

Location of LS Muscae

The location of the star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For LS Muscae, the location is 13h 03m 05.36 and -71° 28` 32.6 .

Proper Motion of LS Muscae

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -2.86 ± 0.53 miliarcseconds/year towards the north and -11.51 ± 0.59 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -5.00000 km/s with an error of about 7.40 km/s .

LS Muscae Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 364.82 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of LS Muscae

LS Muscae has a spectral type of B1.5IIIne. This means the star is a blue giant star. The star is 7,241.00 Parsecs from the Galactic Centre or terms of Light Years is 23,617.49 s. The star has a B-V Colour Index of 0 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,531 Kelvin.

LS Muscae Radius has been calculated as being 10.78 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,501,279.31.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 6.83. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

LS Muscae Apparent and Absolute Magnitudes

LS Muscae has an apparent magnitude of 5.93 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of -2.49 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.50. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to LS Muscae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.07 which gave the calculated distance to LS Muscae as 1575.67 light years away from Earth or 483.09 parsecs. It would take a spaceship travelling at the speed of light, 1575.67 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 3.26 which put LS Muscae at a distance of 1000.50 light years or 306.75 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

The star's Galacto-Centric Distance is 7,241.00 Parsecs or 23,617.49 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of LS Muscae

The star is a eruptive Gamma Cassiopeiae variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. LS Muscae brightness ranges from a magnitude of 6.010 to a magnitude of 5.900 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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LS Muscae Facts

Visual Facts

Primary / Proper / Traditional NameLS Muscae
Alternative NamesHD 113120, HIP 63688, LS Mus
Spectral TypeB1.5IIIne
Multiple Star SystemYes
Star TypeGiant Star
Colour blue
GalaxyMilky Way
Absolute Magnitude-2.49 / -1.50
Visual / Apparent Magnitude5.93
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 03m 05.36
Declination (Dec.)-71° 28` 32.6
Galactic Latitude-8.63 degrees
Galactic Longitude303.87 degrees
1997 Distance from Earth2.07 Parallax (milliarcseconds)
 1575.67 Light Years
 483.09 Parsecs
2007 Distance from Earth3.26 Parallax (milliarcseconds)
 1000.50 Light Years
 306.75 Parsecs
Galacto-Centric Distance23,617.49 Light Years / 7,241.00 Parsecs
Proper Motion Dec.-2.86 ± 0.53 milliarcseconds/year
Proper Motion RA.-11.51 ± 0.59 milliarcseconds/year
B-V Index0.00
Radial Velocity-5.00 ± 7.40 km/s
Semi-Major Axis7587.00
Stellar Luminosity (Lsun)364.82

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae
Mean Variability Period in Days0.090
Variable Magnitude Range (Brighter - Dimmer)5.900 - 6.010

Estimated Facts

Calculated Effective Temperature9,531 Kelvin

Sources and Links

SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
113120-70 1553.4A6.00000-11.00000-2.00000B1Blue/White

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