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13 Piscis Austrini, HD209476, HIP108952, HR8405

13 Piscis Austrini is a orange to red giant star that can be located in the constellation of Piscis Austrinus. The description is based on the spectral class. 13 Piscis Austrini is not part of the constellation but is within the borders of the constellation.

The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

13 Piscis Austrini's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR8405. 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.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 13 Piscis Austrini with it shortened to 13 PsA.

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

Location of 13 Piscis Austrini

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For 13 Piscis Austrini, the location is 22h 04m 23.83 and -29° 54` 59.5 .

Radial Velocity and 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 3.32 ± 0.36 miliarcseconds/year towards the north and 3.72 ± 0.48 miliarcseconds/year east if we saw them in the horizon.

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 23.30 km/s with an error of about 0.50 km/s . 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 13 Piscis Austrini

13 Piscis Austrini has a spectral type of K5III. This means the star is a orange to red 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 Radius has been calculated as being 44.48 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 30,949,188.32.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 71.15. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

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. It would take a spaceship travelling at the speed of light, 1299.46 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 1.57 which put 13 Piscis Austrini at a distance of 2077.47 light years or 636.94 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 131,377,390.24 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. 13 Piscis Austrini brightness ranges from a magnitude of 6.585 to a magnitude of 6.536 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 days (variability).

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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13 Piscis Austrini Facts

Visual Facts


Primary / Proper / Traditional Name13 Piscis Austrini
Alternative NamesHD 209476, HIP 108952, HR 8405, 13 PsA
Spectral TypeK5III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
ConstellationPiscis Austrinus
Absolute Magnitude -1.55 / -2.57
Visual / Apparent Magnitude6.45
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)22h 04m 23.83
Declination (Dec.)-29° 54` 59.5
Galactic Latitude-53.40 degrees
Galactic Longitude18.45 degrees
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
 131,377,390.24 Astronomical Units
Proper Motion Dec.3.32 ± 0.36 milliarcseconds/year
Proper Motion RA.3.72 ± 0.48 milliarcseconds/year
B-V Index1.60
Radial Velocity23.30 ± 0.50 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.035
Variable Magnitude Range (Brighter - Dimmer)6.536 - 6.585

Estimated Facts


Calculated Effective Temperature3,779 Kelvin

Sources and Links


SIMBAD SourceLink

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