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HD 31591

HD 31591 Facts

HD 31591's Alternative Names

The Id of the star in the Henry Draper catalogue is HD31591.

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+42 1119.

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

Location of HD 31591

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 31591, the location is 04 59 01.9211329910 and +42 32 45.404395687 .

Radial Velocity and Proper Motion of HD 31591

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 -9.88 miliarcseconds/year towards the north and 0.32 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 7.00 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.

Physical Properties (Colour) of HD 31591

HD 31591 has a spectral type of A5III C. This means the star is a blue giant star.

Distance to HD 31591

The Parallax of the star is given as 2.07 which gives a calculated distance to HD 31591 of 1573.01 light years from the Earth or 482.28 parsecs. It would take a spaceship travelling at the speed of light, 1573.01 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 99,476,697.59 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.

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Additional HD 31591 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 31591
Alternative NamesHD 31591, BD+42 1119
Spectral TypeA5III C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourBlue
GalaxyMilky Way
ConstellationAuriga
Right Ascension (R.A.)04 59 01.9211329910
Declination (Dec.)+42 32 45.404395687
Distance from Earth2.07 Parallax (milliarcseconds)
 1573.01 Light Years
 482.28 Parsecs
 99,476,697.59 Astronomical Units
Proper Motion Dec.-9.88 milliarcseconds/year
Proper Motion RA.0.32 milliarcseconds/year
Radial Velocity7.00 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=hd31591

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