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Psi9 Aurigae, HD50658, HIP33377, HR2568

Psi9 Aurigae is a blue giant star that can be located in the constellation of Auriga. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Psi9 Aurigae's Alternative Names

Psi9 Aurigae (Psi09 Aur) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR2568. HIP33377 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD50658.

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 BD+46 1203.

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

Location of Psi9 Aurigae

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 Psi9 Aurigae, the location is 06h 56m 32.06 and +46° 16` 26.4 .

Proper Motion of Psi9 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 4.07 ± 0.25 miliarcseconds/year towards the north and -2.93 ± 0.38 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 -41.10000 km/s with an error of about 2.90 km/s .

Psi9 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 867.86 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 Psi9 Aurigae

Psi9 Aurigae has a spectral type of B8III. This means the star is a blue giant star. The star is 7,750.00 Parsecs from the Galactic Centre or terms of Light Years is 25,277.66 s. The star has a B-V Colour Index of -0.07 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,845 Kelvin.

Psi9 Aurigae Radius has been calculated as being 4.53 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,154,570.26.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 6.89. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Psi9 Aurigae Apparent and Absolute Magnitudes

Psi9 Aurigae has an apparent magnitude of 5.85 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 -1.17 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.08. 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 Psi9 Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.95 which gave the calculated distance to Psi9 Aurigae as 825.73 light years away from Earth or 253.16 parsecs. It would take a spaceship travelling at the speed of light, 825.73 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 2.59 which put Psi9 Aurigae at a distance of 1259.32 light years or 386.10 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 7,750.00 Parsecs or 25,277.66 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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Psi9 Aurigae Facts

Visual Facts


 Psi9 Aurigae
Alternative NamesPsi09 Aur, HD 50658, HIP 33377, HR 2568, BD+46 1203
Spectral TypeB8III
Multiple Star SystemYes
Star TypeGiant Star
Colour blue
GalaxyMilky Way
ConstellationAuriga
Absolute Magnitude-1.17 / -2.08
Visual / Apparent Magnitude5.85
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 56m 32.06
Declination (Dec.)+46° 16` 26.4
Galactic Latitude20.07 degrees
Galactic Longitude170.30 degrees
1997 Distance from Earth3.95 Parallax (milliarcseconds)
 825.73 Light Years
 253.16 Parsecs
2007 Distance from Earth2.59 Parallax (milliarcseconds)
 1259.32 Light Years
 386.10 Parsecs
Galacto-Centric Distance25,277.66 Light Years / 7,750.00 Parsecs
Proper Motion Dec.4.07 ± 0.25 milliarcseconds/year
Proper Motion RA.-2.93 ± 0.38 milliarcseconds/year
B-V Index-0.07
Radial Velocity-41.10 ± 2.90 km/s
Eccentricity0.36
Semi-Major Axis10216.00
Stellar Luminosity (Lsun)867.86
Associated / Clustered StarsPsi1 Aurigae
Psi2 Aurigae
Psi3 Aurigae
Psi4 Aurigae
Psi5 Aurigae
Psi6 Aurigae

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature10,845 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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