Universe Guide

19 Ursae Minoris

19 Ursae Minoris Facts

  • 19 Ursae Minoris is a main sequence star that can be located in the constellation of Ursa Minor. The description is based on the spectral class.
  • 19 Ursae Minoris is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B8V) of the star, the star's colour is blue .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 617.73 light years away from us. Distance

19 Ursae Minoris's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR6079. HIP79280 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD146926.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 19 Ursae Minoris. The Flamsteed name can be shortened to 19 Umi.

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+76 594.

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

Location of 19 Ursae Minoris

The location of the main sequence 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 19 Ursae Minoris, the location is 16h 10m 49.53 and +75° 52` 39.1 .

Radial Velocity and Proper Motion of 19 Ursae Minoris

Proper Motion

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 13.00 ± 0.17 milliarcseconds/year towards the north and -1.66 ± 0.18 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -0.90000 km/s with an error of about 2.80 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 of 19 Ursae Minoris

19 Ursae Minoris Temperature and Colour

Based on the star's spectral type of B8V , 19 Ursae Minoris's colour and type is blue main sequence star. The star has a B-V Colour Index of -0.09 which means the star's temperature is about 11,375 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

19 Ursae Minoris 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 346.04 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

19 Ursae Minoris Radius

19 Ursae Minoris estimated radius has been calculated as being 3.94 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,738,391.41.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 3.6560281342636070436919404936. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

19 Ursae Minoris Apparent and Absolute Magnitudes

19 Ursae Minoris has an apparent magnitude of 5.48 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 -1.07 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.91. 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 19 Ursae Minoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.90000 which gave the calculated distance to 19 Ursae Minoris as 665.64 light years away from Earth or 204.08 parsecs. If you want that in miles, it is about 3,913,048,193,405,938.16, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 5.28000 which put 19 Ursae Minoris at a distance of 617.73 light years or 189.39 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 39,064,219.45 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 7,454.00 Parsecs or 24,312.22 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to 19 Ursae Minoris

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A380736562,853,274.77
Speed of Sound (Mach 1)767.269539,914,958.42
Concorde (Mach 2)1,534.54269,957,127.37
New Horizons Probe33,00012,553,333.64
Speed of Light670,616,629.00617.73

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 19 Ursae Minoris Facts and Figures

Visual Facts

Primary / Proper / Traditional Name19 Ursae Minoris
Alternative NamesHD 146926, HIP 79280, HR 6079, 19 Umi, BD+76 594
Spectral TypeB8V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
ConstellationUrsa Minor
Absolute Magnitude -1.07 / -0.91
Visual / Apparent Magnitude5.48
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 10m 49.53
Declination (Dec.)+75° 52` 39.1
Galactic Latitude35.60751157 degrees
Galactic Longitude109.67135149 degrees
1997 Distance from Earth4.90000 Parallax (milliarcseconds)
 665.64 Light Years
 204.08 Parsecs
2007 Distance from Earth5.28000 Parallax (milliarcseconds)
 617.73 Light Years
 189.39 Parsecs
 39,064,219.45 Astronomical Units
Galacto-Centric Distance24,312.22 Light Years / 7,454.00 Parsecs
Proper Motion Dec.13.00000 ± 0.17000 milliarcseconds/year
Proper Motion RA.-1.66000 ± 0.18000 milliarcseconds/year
B-V Index-0.09
Radial Velocity-0.90000 ± 2.80 km/s
Semi-Major Axis8561.0000000
Stellar Luminosity (Lsun)346.0400000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)3.66
Effective Temperature11,375 Kelvin

Sources and Links

SIMBAD SourceLink

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