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Pi1 Doradus, HD45669, HIP30321, HR2352

Pi1 Doradus is a orange to red giant star that can be located in the constellation of Dorado. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Pi1 Doradus's Alternative Names

Pi1 Doradus is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR2352. HIP30321 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD45669.

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

Location of Pi1 Doradus

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 Pi1 Doradus, the location is 06h 22m 38.23 and -69° 59` 02.9 .

Proper Motion of Pi1 Doradus

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 33.82 ± 0.19 miliarcseconds/year towards the north and 26.78 ± 0.19 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 us is 15.70000 km/s with an error of about 2.90 km/s .

Pi1 Doradus 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 542.2800000 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Pi1 Doradus

Pi1 Doradus has a spectral type of K5III. This means the star is a orange to red giant star. The star is 7372.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24044.7617196800000000s. The star has a B-V Colour Index of 1.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,971 Kelvin.

Pi1 Doradus Radius has been calculated as being 27.87 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,390,786.26.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 28.91. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Pi1 Doradus Apparent and Absolute Magnitudes

Pi1 Doradus has an apparent magnitude of 5.56 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 -0.75 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.83. 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 Pi1 Doradus

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.48 which gave the calculated distance to Pi1 Doradus as 595.19 light years away from Earth or 182.48 parsecs. It would take a spaceship travelling at the speed of light, 595.19 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 5.27 which put Pi1 Doradus at a distance of 618.91 light years or 189.75 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.

The star's Galacto-Centric Distance is 7,372.00 Parsecs or 24,044.76 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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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Pi1 Doradus Facts

Visual Facts

Alternative NamesHD 45669, HIP 30321, HR 2352
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude-0.75 / -0.83
Visual / Apparent Magnitude5.56
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 22m 38.23
Declination (Dec.)-69° 59` 02.9
Galactic Latitude-27.82 degrees
Galactic Longitude280.35 degrees
1997 Distance from Earth5.48 Parallax (milliarcseconds)
 595.19 Light Years
 182.48 Parsecs
2007 Revised Distance from Earth5.27 Parallax (milliarcseconds)
 618.91 Light Years
 189.75 Parsecs
Galacto-Centric Distance24,044.76 Light Years / 7,372.00 Parsecs
Proper Motion Dec.33.82 ± 0.19 milliarcseconds/year
Proper Motion RA.26.78 ± 0.19 milliarcseconds/year
B-V Index1.51
Radial Velocity15.70 ± 2.90 km/s
Semi-Major Axis6421.00
Stellar Luminosity (Lsun)542.28
Spectral TypeK5III
Associated / Clustered StarsPi2 Doradus
Colour(K) Orange to Red

Estimated Facts

Calculated Effective Temperature3,971 Kelvin

Sources and Links

SIMBAD SourceLink

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