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HomeFactsConstellationsUrsa Major

HIP 64631, HD115229

HIP 64631 is a orange to red star that can be located in the constellation of UrsaMajor. 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 64631's Alternative Names

HIP64631 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD115229.

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+55 1586.

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

Location of HIP 64631

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 64631, the location is 13h 14m 50.28 and +54° 28` 14.1 .

Proper Motion of HIP 64631

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 -47.57 ± 0.56 miliarcseconds/year towards the north and -10.77 ± 0.81 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -40.27000 km/s with an error of about 0.52 km/s .

Physical Properties (Colour, Temperature) of HIP 64631

HIP 64631 has a spectral type of K5. This means the star is a orange to red star. The star has a B-V Colour Index of 1.37 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,262 Kelvin.

HIP 64631 Radius has been calculated as being 11.16 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,765,185.04.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 13.54. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 64631 Apparent and Absolute Magnitudes

HIP 64631 has an apparent magnitude of 8.45 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 0.93 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.51. 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 64631

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.13 which gave the calculated distance to HIP 64631 as 1042.06 light years away from Earth or 319.49 parsecs. It would take a spaceship travelling at the speed of light, 1042.06 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 2.58 which put HIP 64631 at a distance of 1264.20 light years or 387.60 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 64631 Facts

Visual Facts


 HIP 64631
Alternative NamesHD 115229, HIP 64631, BD+55 1586
Spectral TypeK5
Multiple Star SystemNo / Unknown
Star TypeStar
Colour orange to red
GalaxyMilky Way
ConstellationUrsa Major
Absolute Magnitude0.93 / 0.51
Visual / Apparent Magnitude8.45
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 14m 50.28
Declination (Dec.)+54° 28` 14.1
Galactic Latitude62.32 degrees
Galactic Longitude115.61 degrees
1997 Distance from Earth3.13 Parallax (milliarcseconds)
 1042.06 Light Years
 319.49 Parsecs
2007 Distance from Earth2.58 Parallax (milliarcseconds)
 1264.20 Light Years
 387.60 Parsecs
Proper Motion Dec.-47.57 ± 0.56 milliarcseconds/year
Proper Motion RA.-10.77 ± 0.81 milliarcseconds/year
B-V Index1.37
Radial Velocity-40.27 ± 0.52 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature4,262 Kelvin

Sources and Links


SIMBAD SourceLink

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