Universe Guide


109 G. Hya - HD79481 - HIP45305

109 G. Hya is a white to yellow subgiant star that can be located in the constellation of Hydra. HIP45305 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD79481. The Id of the star in the Gould Star Catalogue is 109. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

Location of 109 G. Hya

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 109 G. Hya, the location is 09h 14m 03.09 and -14d41`41.3 .

Proper Motion of 109 G. Hya

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 -016.43 ± 000.37 towards the north and -006.27 ± 000.58 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 109 G. Hya

109 G. Hya has a spectral type of G6/G8III/IV. This means the star is a white to yellow coloured subgiant star. The star has a B-V Colour Index of 0.95 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,948 Kelvin.

109 G. Hya has been calculated as 11.27 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,843,788.88.km.

109 G. Hya Apparent and Absolute Magnitudes

109 G. Hya has an apparent magnitude of 6.46 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 0.26 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.36. 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 109 G. Hya

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.75 which gave the calculated distance to 109 G. Hya as 567.24 light years away from Earth or 173.91 parsecs. In 2007, Hipparcos data was revised with a new parallax of 6.02 which put 109 G. Hya at a distance of 541.80 light years or 166.11 parsecs.

It would take a spaceship travelling at the speed of light, 567.24 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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109 G. Hya Facts

Alternative Names

Traditional Name109 G. Hya
Hipparcos Library I.D.45305
Bonner DurchmusterungBD-14 2786
Gould I.D.109
Henry Draper Designation79481

Visual Facts

Star Typesubgiant star
Absolute Magnitude0.26 / 0.36
Apparent Magnitude6.46
Right Ascension (R.A.)09h 14m 03.09
Declination (Dec.)-14d41`41.3
1997 Distance from Earth5.75 Parallax (milliarcseconds)
 567.24 Light Years
 173.91 Parsecs
2007 Distance from Earth6.02 Parallax (milliarcseconds)
 541.80 Light Years
 166.11 Parsecs
Proper Motion Dec.-16.43 ± 0.37 milliarcseconds/year
Proper Motion RA.-6.27 ± 0.58 milliarcseconds/year
B-V Index0.95
Spectral TypeG6/G8III/IV
Colour(G) White to Yellow

Estimated Facts

Radius (x the Sun)11.27
Calculated Effective Temperature4,948 Kelvin

Sources and Links

SIMBAD SourceLink

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