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HD 47012

HD 47012 Facts

HD 47012's Alternative Names

HIP31469 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD47012.

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-21 1514.

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

Location of HD 47012

The location of the giant 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 object is compared to the celestial equator and is expressed in degrees. For HD 47012, the location is 06h 35m 30.81 and -22° 06` 32.4 .

Proper Motion of HD 47012

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 -20.72 ± 0.29 milliarcseconds/year towards the north and 9.89 ± 0.45 milliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

HD 47012 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 66.47 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 HD 47012

HD 47012 Colour and Temperature

HD 47012 has a spectral type of K0III. This means the star is a orange to red giant star. The star has a B-V Colour Index of 1.03 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,792 Kelvin.

HD 47012 Radius

Radius has been calculated as being 11.64 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,097,500.28.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 9.91. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HD 47012 Apparent and Absolute Magnitudes

HD 47012 has an apparent magnitude of 6.32 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 0.33 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.68. 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 HD 47012

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.35 which gave the calculated distance to HD 47012 as 513.64 light years away from Earth or 157.48 parsecs. It would take a spaceship travelling at the speed of light, 513.64 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 7.44 which put HD 47012 at a distance of 438.39 light years or 134.41 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.

Using the 2007 distance, the star is roughly 27,723,859.43 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,482.00 Parsecs or 24,403.54 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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Additional HD 47012 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 47012
Alternative NamesHD 47012, HIP 31469, BD-21 1514
Spectral TypeK0III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationCanis Major
Absolute Magnitude 0.33 / 0.68
Visual / Apparent Magnitude6.32
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 35m 30.81
Declination (Dec.)-22° 06` 32.4
Galactic Latitude-13.23 degrees
Galactic Longitude231.23 degrees
1997 Distance from Earth6.35 Parallax (milliarcseconds)
 513.64 Light Years
  157.48 Parsecs
2007 Distance from Earth7.44 Parallax (milliarcseconds)
 438.39 Light Years
 134.41 Parsecs
 27,723,859.43 Astronomical Units
Galacto-Centric Distance24,403.54 Light Years / 7,482.00 Parsecs
Proper Motion Dec.-20.72 ± 0.29 milliarcseconds/year
Proper Motion RA.9.89 ± 0.45 milliarcseconds/year
B-V Index1.03
Stellar Luminosity (Lsun)66.47

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)9.91
Effective Temperature4,792 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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