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HIP 76805, HD139300

HIP 76805 Facts

HIP 76805's Alternative Names

HIP76805 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD139300.

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

Location of HIP 76805

The location of the giant 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 object is compared to the celestial equator and is expressed in degrees. For HIP 76805, the location is 15h 40m 56.44 and -63° 11` 40.5 .

Proper Motion of HIP 76805

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 -7.06 ± 0.42 milliarcseconds/year towards the north and -1.18 ± 0.64 milliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of HIP 76805

HIP 76805 Colour and Temperature

HIP 76805 has a spectral type of B3III. This means the star is a blue giant star. The star has a B-V Colour Index of -0.03 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,010 Kelvin.

HIP 76805 Radius

Radius has been calculated as being 13.87 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,650,539.27.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 17.62. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 76805 Apparent and Absolute Magnitudes

HIP 76805 has an apparent magnitude of 7.49 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 -3.25 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.77. 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 HIP 76805

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.71 which gave the calculated distance to HIP 76805 as 4593.85 light years away from Earth or 1408.45 parsecs. It would take a spaceship travelling at the speed of light, 4593.85 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 0.56 which put HIP 76805 at a distance of 5824.35 light years or 1785.71 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.

Using the 2007 distance, the star is roughly 368,326,560.63 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

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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Additional HIP 76805 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHIP 76805
Alternative NamesHD 139300, HIP 76805
Spectral TypeB3III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourBlue
GalaxyMilky Way
ConstellationTriangulum Australe
Absolute Magnitude -3.25 / -3.77
Visual / Apparent Magnitude7.49
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 40m 56.44
Declination (Dec.)-63° 11` 40.5
Galactic Latitude-6.34 degrees
Galactic Longitude320.74 degrees
1997 Distance from Earth0.71 Parallax (milliarcseconds)
 4593.85 Light Years
 1408.45 Parsecs
2007 Distance from Earth0.56 Parallax (milliarcseconds)
 5824.35 Light Years
 1785.71 Parsecs
 368,326,560.63 Astronomical Units
Proper Motion Dec.-7.06 ± 0.42 milliarcseconds/year
Proper Motion RA.-1.18 ± 0.64 milliarcseconds/year
B-V Index-0.03

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)17.62
Effective Temperature10,010 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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