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26 Librae, HD135230, HIP74600, HR5662

26 Librae is a blue giant star that can be located in the constellation of Libra. 26 Librae is the brightest star in Libra based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

The Id of the star in the Yale Bright Star Catalogue is HR5662. HIP74600 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD135230.

Location of 26 Librae

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 26 Librae, the location is 15h 14m 33.77 and -17d 46` 06.7 .

Proper Motion of 26 Librae

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 -16.34 ± 0.21 miliarcseconds/year towards the north and -13.61 ± 0.39 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 26 Librae

26 Librae has a spectral type of B9III. This means the star is a blue giant star. The star is 7206.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23503.3305686400000000s. The star has a B-V Colour Index of -0.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,679 Kelvin.

26 Librae Radius has been calculated as being 7.61 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,293,519.56.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 4.73. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

26 Librae Apparent and Absolute Magnitudes

26 Librae has an apparent magnitude of 6.18 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 -1.80 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.77. 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 26 Librae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.54 which gave the calculated distance to 26 Librae as 1284.11 light years away from Earth or 393.70 parsecs. It would take a spaceship travelling at the speed of light, 1284.11 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 4.08 which put 26 Librae at a distance of 799.42 light years or 245.10 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 7,206.00 Parsecs or 23,503.33 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.

26 Librae Facts

Alternative Names

Traditional/Proper Name26 Librae
Flamsteed Name26 Librae
Flamsteed Short Name26 Lib
Hipparcos Library I.D.74600
Yale Bright Star Catalogue (HR) Id5662
Bonner DurchmusterungBD-17 4285
Henry Draper Designation135230

Visual Facts

Star Typegiant star
Absolute Magnitude-1.80 / -0.77
Visual / Apparent Magnitude6.18
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 14m 33.77
Declination (Dec.)-17d 46` 06.7
Galactic Latitude33.26 degrees
Galactic Longitude344.68 degrees
1997 Distance from Earth2.54 Parallax (milliarcseconds)
 1284.11 Light Years
 393.70 Parsecs
2007 Revised Distance from Earth4.08 Parallax (milliarcseconds)
 799.42 Light Years
 245.10 Parsecs
Galacto-Centric Distance23,503.33 Light Years / 7,206.00 Parsecs
Proper Motion Dec.-16.34 ± 0.21 milliarcseconds/year
Proper Motion RA.-13.61 ± 0.39 milliarcseconds/year
B-V Index-0.01
Radial Velocity-25.90 ± 2.90 km/s
Spectral TypeB9III
Colour(B) blue

Estimated Facts

Calculated Effective Temperature9,679 Kelvin

Sources and Links

SIMBAD SourceLink

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