Universe Guide

147 G. Hya - HD82074 - HIP46543

147 G. Hya is a white to yellow subgiant star that can be located in the constellation of Hydra. HIP46543 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD82074. The Id of the star in the Gould Star Catalogue is 147. 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 147 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 from celestial equator. The Declination is how up or down compared to the celestial equator and is expressed in degrees. For 147 G. Hya, the location is 09h 29m 32.43 and -04 d 14`47.4 .

Proper Motion of 147 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 -052.00 ± 000.00 towards the north and -031.00 ± 001.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 147 G. Hya

147 G. Hya has a spectral type of G6IV. This means the star is a white to yellow coloured subgiant star. The star has a B-V Colour Index of 0.83 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,212 Kelvin.

147 G. Hya has been calculated as 3.57 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,485,158.99.km.

147 G. Hya Apparent and Absolute Magnitudes

147 G. Hya has an apparent magnitude of 6.25 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 2.53 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.53. 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 147 G. Hya

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 18.00 which gave the calculated distance to 147 G. Hya as 181.20 light years away from us or 55.56 parsecs. In 2007, Hipparcos data was revised with a new parallax of 18.00 which put 147 G. Hya at a distance of 181.20 light years or 55.56 parsecs.

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.

147 G. Hya Facts


Traditional Name147 G. Hya
Hipparcos Library I.D.46543
Gould I.D.147
Henry Draper Designation82074
Celestial TypeStar
Absolute Magnitude2.53 / 2.53
Apparent Magnitude6.25
Right Ascension (R.A.)09h 29m 32.43
Declination (Dec.)-04 d 14`47.4
1997 Distance18.00 Parallax (milliarcseconds)
 181.20 Light Years
 55.56 Parsecs
2007 Distance18.00 Parallax (milliarcseconds)
 181.20 Light Years
 55.56 Parsecs
Proper Motion Dec.-52.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-31.00 ± 1.00 milliarcseconds/year
B-V Index0.83
Spectral TypeG6IV
Colour(G) White to Yellow
Star Typesubgiant star
Radius (x the Sun)3.57
Calculated Effective Temperature5,212 Kelvin


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