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HIP 66224, HD117887

HIP 66224 is a white to yellow subgiant star that can be located in the constellation of Centaurus. The description is based on the spectral class. HIP 66224 is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it.

HIP 66224's Alternative Names

HIP66224 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD117887.

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

Location of HIP 66224

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 66224, the location is 13h 34m 23.17 and -53° 41` 11.1 .

Proper Motion of HIP 66224

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 -3.06 ± 0.63 miliarcseconds/year towards the north and 3.52 ± 0.99 miliarcseconds/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.

Physical Properties (Colour, Temperature) of HIP 66224

HIP 66224 has a spectral type of G5/G6III/IV. This means the star is a white to yellow subgiant star. The star has a B-V Colour Index of 0.88 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,096 Kelvin.

HIP 66224 Radius has been calculated as being 6.00 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,177,478.90.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 8.80. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 66224 Apparent and Absolute Magnitudes

HIP 66224 has an apparent magnitude of 8.77 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 1.50 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.67. 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 66224

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.52 which gave the calculated distance to HIP 66224 as 926.60 light years away from Earth or 284.09 parsecs. It would take a spaceship travelling at the speed of light, 926.60 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 2.40 which put HIP 66224 at a distance of 1359.01 light years or 416.67 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 85,943,757.95 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.

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 66224 Facts

Visual Facts


Primary / Proper / Traditional NameHIP 66224
Alternative NamesHD 117887, HIP 66224
Spectral TypeG5/G6III/IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationCentaurus
Absolute Magnitude 1.50 / 0.67
Visual / Apparent Magnitude8.77
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 34m 23.17
Declination (Dec.)-53° 41` 11.1
Galactic Latitude8.65 degrees
Galactic Longitude309.34 degrees
1997 Distance from Earth3.52 Parallax (milliarcseconds)
 926.60 Light Years
 284.09 Parsecs
2007 Distance from Earth2.40 Parallax (milliarcseconds)
 1359.01 Light Years
 416.67 Parsecs
 85,943,757.95 Astronomical Units
Proper Motion Dec.-3.06 ± 0.63 milliarcseconds/year
Proper Motion RA.3.52 ± 0.99 milliarcseconds/year
B-V Index0.88

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature5,096 Kelvin

Sources and Links


SIMBAD SourceLink

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