Universe Guide


Psi5 Aurigae, 56 Aurigae, HD48682, HIP32480

Psi5 Aurigae is a white to yellow main sequence dwarf star that can be located in the constellation of Auriga. Psi5 Aurigae is the brightest star in Auriga based on the Hipparcos 2007 apparent magnitude. 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 3.20 Billion of Years but could be as young as 1.30 to 4.60 according to Hipparcos.

Psi5 Aurigae is the Bayer Classification for the star. HIP32480 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD48682. The Gliese ID of the star is Gliese GL245. 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 Psi5 Aurigae

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 Psi5 Aurigae, the location is 06h 46m 44.34 and +43d34`37.3 .

Proper Motion of Psi5 Aurigae

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 164.25 ± 0.18 miliarcseconds/year towards the north and -1.07 ± 0.30 miliarcseconds/year east if we saw them in the horizon.

Psi5 Aurigae 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 1.0000000 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, Age, Radius) of Psi5 Aurigae

Psi5 Aurigae has a spectral type of G0V. This means the star is a white to yellow main sequence dwarf star. The star is 7416.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24188.2735910400000000s. The star has a B-V Colour Index of 0.57 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,006 Kelvin.

Psi5 Aurigae Radius has been calculated as being 1.28 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 887,516.49.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.29. 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 0.07 with an error value of 0.01 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 3.20 Billion years old but could be between 1.30 and 4.60 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Psi5 Aurigae Apparent and Absolute Magnitudes

Psi5 Aurigae has an apparent magnitude of 5.24 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 4.15 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.12. 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 Psi5 Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 60.56 which gave the calculated distance to Psi5 Aurigae as 53.86 light years away from Earth or 16.51 parsecs. It would take a spaceship travelling at the speed of light, 53.86 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 59.82 which put Psi5 Aurigae at a distance of 54.52 light years or 16.72 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 7,416.00 Parsecs or 24,188.27 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.

Psi5 Aurigae Facts

Alternative Names

Flamsteed Name56 Aurigae
Flamsteed Short Name56 Aur
Bayer DesignationPsi5 Aurigae
Hipparcos Library I.D.32480
Bonner DurchmusterungBD+43 1595
Gliese ID245
Henry Draper Designation48682

Visual Facts

Star Typemain sequence dwarf star
Age3.20 Billion Years Old
Age Range1.30 - 4.60 Billion Years Old
Absolute Magnitude4.15 / 4.12
Visual / Apparent Magnitude5.24
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 46m 44.34
Declination (Dec.)+43d34`37.3
Galactic Latitude17.52 degrees
Galactic Longitude172.36 degrees
1997 Distance from Earth60.56 Parallax (milliarcseconds)
 53.86 Light Years
 16.51 Parsecs
2007 Revised Distance from Earth59.82 Parallax (milliarcseconds)
 54.52 Light Years
 16.72 Parsecs
Galacto-Centric Distance24,188.27 Light Years / 7,416.00 Parsecs
Proper Motion Dec.164.25 ± 0.18 milliarcseconds/year
Proper Motion RA.-1.07 ± 0.30 milliarcseconds/year
B-V Index0.57
Radial Velocity-23.85 ± 0.09 km/s
Iron Abundance0.07 ± 0.01 Fe/H
Spectral TypeG0V
Colour(G) White to Yellow

Estimated Facts

Luminosity (x the Sun)1.0000000
Calculated Effective Temperature6,006 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
48682+43 1595.0A5.40000-2.00000164.00000G0Yellow
+43 1596.0B8.4000014.00000-5.000001958

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