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Dziban, Psi1 Draconis, 31 Draconis, HD162003, HIP86614, HR6636

Dziban (Psi1 Draconis) is a blue to white star that can be located in the constellation of Draco. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 2.30 Billion of Years but could be as young as 2.20 to 2.40 according to Hipparcos.

Psi1 Draconis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR6636. HIP86614 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD162003. The Gliese ID of the star is GL 694.1A. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Ref : Star Names.

Location of Dziban

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 Dziban, the location is 17h 41m 56.31 and +72d 08` 58.2 .

Proper Motion of Dziban

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 -268.47 ± 0.34 miliarcseconds/year towards the north and 25.32 ± 0.45 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 -13.30000 km/s with an error of about 0.20 km/s .

Physical Properties (Colour, Temperature, Age, Radius) of Dziban

Dziban has a spectral type of F5IV-V. This means the star is a blue to white star. The star is 7404.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24149.1339897600000000s. The star has a B-V Colour Index of 0.43 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,590 Kelvin.

Dziban Radius has been calculated as being 1.93 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,341,494.88.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.99. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.03 with an error value of 0.02 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 2.30 Billion years old but could be between 2.20 and 2.40 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Dziban Apparent and Absolute Magnitudes

Dziban has an apparent magnitude of 4.57 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 2.85 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.78. 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 Dziban

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 45.38 which gave the calculated distance to Dziban as 71.87 light years away from Earth or 22.04 parsecs. It would take a spaceship travelling at the speed of light, 71.87 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 43.79 which put Dziban at a distance of 74.48 light years or 22.84 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 7,404.00 Parsecs or 24,149.13 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.

Dziban Facts

Alternative Names

Traditional/Proper NameDziban
Flamsteed Name31 Draconis
Flamsteed Short Name31 Dra
Bayer DesignationPsi1 Draconis
Hipparcos Library I.D.86614
Yale Bright Star Catalogue (HR) Id6636
Bonner DurchmusterungBD+72 804
Gliese IDGL 694.1A
Henry Draper Designation162003

Visual Facts

Star Type star
ConstellationDraco
Age2.30 Billion Years Old
Age Range2.20 - 2.40 Billion Years Old
Absolute Magnitude2.85 / 2.78
Visual / Apparent Magnitude4.57
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 41m 56.31
Declination (Dec.)+72d 08` 58.2
Galactic Latitude31.03 degrees
Galactic Longitude102.97 degrees
1997 Distance from Earth45.38 Parallax (milliarcseconds)
 71.87 Light Years
 22.04 Parsecs
2007 Revised Distance from Earth43.79 Parallax (milliarcseconds)
 74.48 Light Years
 22.84 Parsecs
Galacto-Centric Distance24,149.13 Light Years / 7,404.00 Parsecs
Proper Motion Dec.-268.47 ± 0.34 milliarcseconds/year
Proper Motion RA.25.32 ± 0.45 milliarcseconds/year
B-V Index0.43
Radial Velocity-13.30 ± 0.20 km/s
Iron Abundance-0.03 ± 0.02 Fe/H
Spectral TypeF5IV-V
Associated / Clustered StarsDsiban
Psi2 Draconis
Colour(F) blue to white

Estimated Facts

Calculated Effective Temperature6,590 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars


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