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HIP 66245, HD117920

HIP 66245 is a orange to red giant star that can be located in the constellation of Centaurus. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

HIP 66245's Alternative Names

HIP66245 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD117920.

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

Location of HIP 66245

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 HIP 66245, the location is 13h 34m 38.62 and -51° 28` 11.9 .

Proper Motion of HIP 66245

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 -16.11 ± 0.77 miliarcseconds/year towards the north and -26.41 ± 1.21 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature) of HIP 66245

HIP 66245 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 1.16 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,558 Kelvin.

HIP 66245 Radius has been calculated as being 7.97 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,544,032.13.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 12.17. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 66245 Apparent and Absolute Magnitudes

HIP 66245 has an apparent magnitude of 8.89 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 1.37 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.45. 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 HIP 66245

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.14 which gave the calculated distance to HIP 66245 as 1038.74 light years away from Earth or 318.47 parsecs. It would take a spaceship travelling at the speed of light, 1038.74 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 2.05 which put HIP 66245 at a distance of 1591.04 light years or 487.80 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.

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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HIP 66245 Facts

Visual Facts


Primary / Proper / Traditional NameHIP 66245
Alternative NamesHD 117920, HIP 66245
Spectral TypeK0III
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
ConstellationCentaurus
Absolute Magnitude1.37 / 0.45
Visual / Apparent Magnitude8.89
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 34m 38.62
Declination (Dec.)-51° 28` 11.9
Galactic Latitude10.83 degrees
Galactic Longitude309.76 degrees
1997 Distance from Earth3.14 Parallax (milliarcseconds)
 1038.74 Light Years
 318.47 Parsecs
2007 Distance from Earth2.05 Parallax (milliarcseconds)
 1591.04 Light Years
 487.80 Parsecs
Proper Motion Dec.-16.11 ± 0.77 milliarcseconds/year
Proper Motion RA.-26.41 ± 1.21 milliarcseconds/year
B-V Index1.16

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature4,558 Kelvin

Sources and Links


SIMBAD SourceLink

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