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Tonatiuh - HD104985 - HIP58952 - HR4609

Tonatiuh is a white to yellow giant star that can be located in the constellation of Camelopardalis. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. It is calculated at being 2.950 Billion Years old. This information comes from ExoPlanet.

The Id of the star in the Yale Bright Star Catalogue is HR4609. HIP58952 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD104985. Tonatiuh has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of Tonatiuh

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 Tonatiuh, the location is 12h 05m 14.74 and +76d54`21.4 .

Proper Motion of Tonatiuh

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 -91.65 ± 0.19 miliarcseconds/year towards the north and 147.68 ± 0.25 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age, Mass, Radius) of Tonatiuh

Tonatiuh has a spectral type of G9III. This means the star is a white to yellow giant star. The star is 7445.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24282.8609608000000000s. The star has a B-V Colour Index of 1.02 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,811 Kelvin.

Tonatiuh Radius has been calculated as being 9.56 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,651,350.77.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 9.13. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 2.00 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is -0.350000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

The star is believed to be about 2.95 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

Tonatiuh Apparent and Absolute Magnitudes

Tonatiuh has an apparent magnitude of 5.78 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 0.74 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.84. 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 Tonatiuh

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.80 which gave the calculated distance to Tonatiuh as 332.82 light years away from Earth or 102.04 parsecs. It would take a spaceship travelling at the speed of light, 332.82 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 10.30 which put Tonatiuh at a distance of 316.66 light years or 97.09 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 7,445.00 Parsecs or 24,282.86 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.

Tonatiuh Facts

Alternative Names

Traditional/Proper NameTonatiuh
Hipparcos Library I.D.58952
Yale Bright Star Catalogue (HR) Id4609
Bonner DurchmusterungBDD+77 461
Henry Draper Designation104985

Visual Facts

Star Typegiant star
Age2.95 Billion Years Old
Absolute Magnitude0.74 / 0.84
Visual / Apparent Magnitude5.78
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)12h 05m 14.74
Declination (Dec.)+76d54`21.4
Galactic Latitude39.92 degrees
Galactic Longitude126.32 degrees
1997 Distance from Earth9.80 Parallax (milliarcseconds)
 332.82 Light Years
 102.04 Parsecs
2007 Revised Distance from Earth10.30 Parallax (milliarcseconds)
 316.66 Light Years
 97.09 Parsecs
Galacto-Centric Distance24,282.86 Light Years / 7,445.00 Parsecs
Proper Motion Dec.-91.65 ± 0.19 milliarcseconds/year
Proper Motion RA.147.68 ± 0.25 milliarcseconds/year
B-V Index1.02
Radial Velocity-20.19 ± 0.26 km/s
Iron Abundance-0.32 ± 0.03 Fe/H
Spectral TypeG9III
Colour(G) White to Yellow

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature4,811 Kelvin
Mass Compared to the Sun2.00
Metallicity-0.35000

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Tonatiuh in Camelopardalis


Tonatiuh Location in Camelopardalis

The map was generated using Night Vision, an awesome free application by Brian Simpson.


List of Extrasolar Planets orbiting Tonatiuh


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
Hd 104985 BConfirmed8.3199.5050.0920030.95204.000

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