Universe Guide

13 Piscis Austrini

13 Piscis Austrini Facts

  • 13 Piscis Austrini is a 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 outline but is within the borders of the constellation.
  • Based on the spectral type (K5III) of the star, the star's colour is orange to red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 2077.47 light years away from us. Distance

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 named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 13 Piscis Austrini. The Flamsteed name can be shortened to 13 Psa.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is CD-30 18985.

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

Location of 13 Piscis Austrini

The location of the giant 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 object 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

Proper Motion

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 milliarcseconds/year towards the north and 3.72 ± 0.48 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 23.30000 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 of 13 Piscis Austrini

13 Piscis Austrini Temperature and Colour

Based on the star's spectral type of K5III , 13 Piscis Austrini's colour and type is orange to red giant star. The star has a B-V Colour Index of 1.6 which means the star's temperature is about 3,779 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

13 Piscis Austrini Radius

13 Piscis Austrini estimated 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 71.149991581262555947666662802. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It 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 2.51000 which gave the calculated distance to 13 Piscis Austrini as 1299.46 light years away from Earth or 398.41 parsecs. If you want that in miles, it is about 7,639,038,527,437,173.85, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.57000 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.

Travel Time to 13 Piscis Austrini

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A3807361,892,915,663.38
Speed of Sound (Mach 1)767.2691,815,772,471.26
Concorde (Mach 2)1,534.54907,885,052.36
New Horizons Probe33,00042,217,755.40
Speed of Light670,616,629.002,077.47
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.

Hide Explanations
Show GridLines

Additional 13 Piscis Austrini Facts and Figures

Visual Facts

Primary / Proper / Traditional Name13 Piscis Austrini
Alternative NamesHD 209476, HIP 108952, HR 8405, 13 Psa, CD-30 18985
Spectral TypeK5III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourOrange 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-53.40155432 degrees
Galactic Longitude18.45380492 degrees
1997 Distance from Earth2.51000 Parallax (milliarcseconds)
 1299.46 Light Years
 398.41 Parsecs
2007 Distance from Earth1.57000 Parallax (milliarcseconds)
 2077.47 Light Years
 636.94 Parsecs
 131,377,390.24 Astronomical Units
Proper Motion Dec.3.32000 ± 0.36000 milliarcseconds/year
Proper Motion RA.3.72000 ± 0.48000 milliarcseconds/year
B-V Index1.6
Radial Velocity23.30000 ± 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 Calculated Facts

Radius (x the Sun)71.15
Effective Temperature3,779 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

This website is using cookies. More info. That's Fine