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Omega Lupi - HD139127 - HIP76552

Omega Lupi is a orange to red giant star that can be located in the constellation of Lupus. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Omega Lupi is the Bayer Classification for the star. HIP76552 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD139127.

Location of Omega Lupi

The location of the star in the galaxy 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 Omega Lupi, the location is 15h 38m 03.32 and -42d34`02.9 .

Proper Motion of Omega Lupi

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 57.37 ± 0.16 miliarcseconds/year towards the north and -149.80 ± 0.27 miliarcseconds/year east if we saw them in the horizon.

Omega Lupi 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 45.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of Omega Lupi

Omega Lupi has a spectral type of K4.5III. This means the star is a orange to red giant star. The star is 7341.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23943.6510830400000000s. The star has a B-V Colour Index of 1.41 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,143 Kelvin.

Omega Lupi Radius has been calculated as being 17.31 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 12,043,618.27.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 16.45. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Omega Lupi Apparent and Absolute Magnitudes

Omega Lupi has an apparent magnitude of 4.34 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 0.10 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.21. 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 Omega Lupi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 14.19 which gave the calculated distance to Omega Lupi as 229.85 light years away from Earth or 70.47 parsecs. It would take a spaceship travelling at the speed of light, 229.85 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 14.92 which put Omega Lupi at a distance of 218.61 light years or 67.02 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 7,341.00 Parsecs or 23,943.65 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Omega Lupi Facts

Alternative Names

Bayer DesignationOmega Lupi
Hipparcos Library I.D.76552
Henry Draper Designation139127

Visual Facts

Star Typegiant star
Absolute Magnitude0.10 / 0.21
Visual / Apparent Magnitude4.34
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)15h 38m 03.32
Declination (Dec.)-42d34`02.9
Galactic Latitude10.44 degrees
Galactic Longitude332.78 degrees
1997 Distance from Earth14.19 Parallax (milliarcseconds)
 229.85 Light Years
 70.47 Parsecs
2007 Revised Distance from Earth14.92 Parallax (milliarcseconds)
 218.61 Light Years
 67.02 Parsecs
Galacto-Centric Distance23,943.65 Light Years / 7,341.00 Parsecs
Proper Motion Dec.57.37 ± 0.16 milliarcseconds/year
Proper Motion RA.-149.80 ± 0.27 milliarcseconds/year
B-V Index1.41
Radial Velocity-6.80 ± 2.70 km/s
Spectral TypeK4.5III
Colour(K) Orange to Red

Estimated Facts

Luminosity (x the Sun)45.0000000
Calculated Effective Temperature4,143 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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
139127-4210601.2A4.30000-144.0000059.00000M0Red
B11.00000-144.0000059.000001897

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