Universe Guide

13 Piscis Austrini - HD209476 - HIP108952

13 Piscis Austrini is an orange to red giant star that can be located in the constellation of PiscisAustrinus. HIP108952 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD209476. 13 Piscis Austrini has alternative name(s), 13 Piscis Austrini , 13 PsA.

Location of 13 Piscis Austrini

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 13 Piscis Austrini, the location is 22h 04m 23.83 and -29d54`59.5 .

Proper Motion of 13 Piscis Austrini

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 003.32 ± 000.36 towards the north and 003.72 ± 000.48 east if we saw them in the horizon.

13 Piscis Austrini 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 32.0000000 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 13 Piscis Austrini

13 Piscis Austrini has a spectral type of K5III. This means the star is an orange to red coloured giant star. The star has a B-V Colour Index of 1.6 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,779 Kelvin.

13 Piscis Austrini has been calculated as 44.46 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 30,932,811.83.km.

13 Piscis Austrini Apparent and Absolute Magnitudes

13 Piscis Austrini has an apparent magnitude of 6.45 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 -1.55 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.57. 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 13 Piscis Austrini

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.51 which gave the calculated distance to 13 Piscis Austrini as 1299.46 light years away from Earth or 398.41 parsecs. In 2007, Hipparcos data was revised with a new parallax of 1.57 which put 13 Piscis Austrini at a distance of 2077.47 light years or 636.94 parsecs.

It would take a spaceship travelling at the speed of light, 1299.46 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet. 13 Piscis Austrini brightness ranges from a magnitude of 7.000 to a magnitude of 7.000 over its variable period. The smaller the magnitude, the brighter the star.

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.

13 Piscis Austrini Facts


Traditional Name13 Piscis Austrini
Short Name13 PsA
Alternative Name(s)13 Piscis Austrini
Hipparcos Library I.D.108952
Henry Draper Designation209476
Celestial TypeStar
Absolute Magnitude-1.55 / -2.57
Apparent Magnitude6.45
Right Ascension (R.A.)22h 04m 23.83
Declination (Dec.)-29d54`59.5
1997 Distance from Earth2.51 Parallax (milliarcseconds)
 1299.46 Light Years
 398.41 Parsecs
2007 Distance from Earth1.57 Parallax (milliarcseconds)
 2077.47 Light Years
 636.94 Parsecs
Proper Motion Dec.3.32 ± 0.36 milliarcseconds/year
Proper Motion RA.3.72 ± 0.48 milliarcseconds/year
B-V Index1.60
Spectral TypeK5III
Colour(K) Orange to Red
Star Typegiant star
Radius (x the Sun)44.46
Luminosity (x the Sun)32.0000000
Calculated Effective Temperature3,779 Kelvin


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