Universe Guide


136 G. Hya - HD81567 - HIP46288

136 G. Hya is an orange to red giant star that can be located in the constellation of Hydra. HIP46288 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD81567. The Id of the star in the Gould Star Catalogue is 136. 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 136 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 136 G. Hya, the location is 09h 26m 22.31 and -01d27`50.6 .

Proper Motion of 136 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 -005.28 ± 000.24 towards the north and -001.53 ± 000.35 east if we saw them in the horizon.

136 G. Hya 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 58.0000000 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 136 G. Hya

136 G. Hya has a spectral type of K3III. This means the star is an orange to red coloured giant star. The star has a B-V Colour Index of 1.31 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,306 Kelvin.

136 G. Hya has been calculated as 28.36 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,735,628.94.km.

136 G. Hya Apparent and Absolute Magnitudes

136 G. Hya has an apparent magnitude of 6.01 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 -1.14 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.62. 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 136 G. Hya

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.72 which gave the calculated distance to 136 G. Hya as 876.78 light years away from Earth or 268.82 parsecs. In 2007, Hipparcos data was revised with a new parallax of 4.72 which put 136 G. Hya at a distance of 691.02 light years or 211.86 parsecs.

It would take a spaceship travelling at the speed of light, 876.78 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.

Hide Information, Show Facts and Images Only (Cookie Setting)

136 G. Hya Facts

Alternative Names

Traditional Name136 G. Hya
Hipparcos Library I.D.46288
Bonner DurchmusterungBD-00 2195
Gould I.D.136
Henry Draper Designation81567

Visual Facts

Star Typegiant star
Absolute Magnitude-1.14 / -0.62
Apparent Magnitude6.01
Right Ascension (R.A.)09h 26m 22.31
Declination (Dec.)-01d27`50.6
1997 Distance from Earth3.72 Parallax (milliarcseconds)
 876.78 Light Years
 268.82 Parsecs
2007 Distance from Earth4.72 Parallax (milliarcseconds)
 691.02 Light Years
 211.86 Parsecs
Proper Motion Dec.-5.28 ± 0.24 milliarcseconds/year
Proper Motion RA.-1.53 ± 0.35 milliarcseconds/year
B-V Index1.31
Spectral TypeK3III
Colour(K) Orange to Red

Estimated Facts

Radius (x the Sun)28.36
Luminosity (x the Sun)58.0000000
Calculated Effective Temperature4,306 Kelvin

Sources and Links

SIMBAD SourceLink

Add a Comment

Email: (Optional)