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HIP 65971, HD117845

Primary Facts on HIP 65971

  • HIP 65971's star type is main sequence dwarf star that can be located in the constellation of Ursa Major. The description is based on the spectral class.
  • HIP 65971 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G2V) of the star, the star's colour is white to yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 146.66 light years away from us.

HIP 65971's Alternative Names

HIP65971 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD117845.

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+59 1517.

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

Location of HIP 65971

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 65971, the location is 13h 31m 33.81 and +58° 57` 10.3 .

Radial Velocity and Proper Motion of HIP 65971

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 19.07 ± 0.50 miliarcseconds/year towards the north and -44.94 ± 0.62 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 the Sun is -2.50 km/s with an error of about 0.30 km/s . 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.

HIP 65971 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 1.15 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 HIP 65971

HIP 65971 has a spectral type of G2V. This means the star is a white to yellow main sequence dwarf star. The star is 7,410.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,168.70 s. The star has a B-V Colour Index of 0.58 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,968 Kelvin.

HIP 65971 Radius has been calculated as being 0.96 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 666,320.35.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 0.95. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.34 with an error value of 0.08 Fe/H with the Sun has a value of 1 to put it into context.

HIP 65971 Apparent and Absolute Magnitudes

HIP 65971 has an apparent magnitude of 8.07 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 4.80 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.81. 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 65971

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 22.19 which gave the calculated distance to HIP 65971 as 146.99 light years away from Earth or 45.07 parsecs. It would take a spaceship travelling at the speed of light, 146.99 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 22.24 which put HIP 65971 at a distance of 146.66 light years or 44.96 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 9,273,601.07 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 7,410.00 Parsecs or 24,168.70 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 HIP 65971 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHIP 65971
Alternative NamesHD 117845, HIP 65971, BD+59 1517
Spectral TypeG2V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour white to yellow
GalaxyMilky Way
ConstellationUrsa Major
Absolute Magnitude 4.80 / 4.81
Visual / Apparent Magnitude8.07
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 31m 33.81
Declination (Dec.)+58° 57` 10.3
Galactic Latitude57.42 degrees
Galactic Longitude113.33 degrees
1997 Distance from Earth22.19 Parallax (milliarcseconds)
 146.99 Light Years
 45.07 Parsecs
2007 Distance from Earth22.24 Parallax (milliarcseconds)
 146.66 Light Years
 44.96 Parsecs
 9,273,601.07 Astronomical Units
Galacto-Centric Distance24,168.70 Light Years / 7,410.00 Parsecs
Proper Motion Dec.19.07 ± 0.50 milliarcseconds/year
Proper Motion RA.-44.94 ± 0.62 milliarcseconds/year
B-V Index0.58
Radial Velocity-2.50 ± 0.30 km/s
Iron Abundance-0.34 ± 0.08 Fe/H
Eccentricity0.09
Semi-Major Axis8092.00
Stellar Luminosity (Lsun)1.15

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature5,968 Kelvin

Sources and Links


SIMBAD SourceLink

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