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RT Aurigae, 48 Aurigae, HD45412, HIP30827, HR2332

RT Aurigae is a blue to white pulsating very luminous supergiant star that can be located in the constellation of Auriga. RT 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.

RT Aurigae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR2332. HIP30827 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD45412.

RT Aurigae has alternative name(s), RT Aur.

Location of RT 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 RT Aurigae, the location is 06h 28m 34.09 and +30d 29` 35.1 .

RT 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 16000.0000000 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, Radius) of RT Aurigae

RT Aurigae has a spectral type of F5.5Ibv. This means the star is a blue to white supergiant star. The star has a B-V Colour Index of 0.77 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,490 Kelvin.

RT Aurigae Radius has been calculated as being 34.98 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 24,337,118.56.km. 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 0.13 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

RT Aurigae Apparent and Absolute Magnitudes

RT Aurigae has an apparent magnitude of 5.75 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -2.65 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 RT Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.09 which gave the calculated distance to RT Aurigae as 1560.59 light years away from Earth or 478.47 parsecs. It would take a spaceship travelling at the speed of light, 1560.59 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of RT Aurigae

The star is a pulsating Delta Cepheid variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. RT Aurigae brightness ranges from a magnitude of 5.939 to a magnitude of 5.066 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.7 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.

RT Aurigae Facts

Alternative Names

Flamsteed Name48 Aurigae
Flamsteed Short Name48 Aur
Short NameRT Aur
Bayer DesignationRT Aurigae
Hipparcos Library I.D.30827
Yale Bright Star Catalogue (HR) Id2332
Bonner DurchmusterungBD+30 1238
Henry Draper Designation45412

Visual Facts

Star Typesupergiant star
Visual / Apparent Magnitude5.75
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 28m 34.09
Declination (Dec.)+30d 29` 35.1
Galactic Latitude8.92 degrees
Galactic Longitude183.15 degrees
Distance from Earth2.09 Parallax (milliarcseconds)
 1560.59 Light Years
 478.47 Parsecs
B-V Index0.77
Radial Velocity20.30 ± 0.30 km/s
Iron Abundance0.13 ± 9.99 Fe/H
Spectral TypeF5.5Ibv
Colour(F) blue to white

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days3.728
Variable Magnitude Range (Brighter - Dimmer)5.066 - 5.939

Estimated Facts

Luminosity (x the Sun)16,000.0000000
Calculated Effective Temperature5,490 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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