Universe GuideSearchTwitterComments

DM Ursae Majoris

DM Ursae Majoris Facts

DM Ursae Majoris's Alternative Names

HIP53425 is the reference name for the star in the Hipparcos Star Catalogue.

DM Ursae Majoris has alternative name(s) :- , DM UMa.

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+61 1211.

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

Location of DM Ursae Majoris

The location of the subgiant 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 DM Ursae Majoris, the location is 10h 55m 43.59 and +60° 28` 09.8 .

Radial Velocity and Proper Motion of DM Ursae Majoris

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 -7.51 ± 0.90 milliarcseconds/year towards the north and -37.43 ± 1.28 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 -8.03 km/s with an error of about 0.29 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.

DM Ursae Majoris 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 4.24 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 DM Ursae Majoris

DM Ursae Majoris Colour and Temperature

DM Ursae Majoris has a spectral type of K0/K1III-IV. This means the star is a orange to red subgiant star. The star has a B-V Colour Index of 1.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,830 Kelvin.

DM Ursae Majoris Radius

Radius has been calculated as being 2.56 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,784,261.16.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 2.58. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

DM Ursae Majoris Apparent and Absolute Magnitudes

DM Ursae Majoris has an apparent magnitude of 9.29 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 3.58 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.57. 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 DM Ursae Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.21 which gave the calculated distance to DM Ursae Majoris as 452.38 light years away from Earth or 138.70 parsecs. It would take a spaceship travelling at the speed of light, 452.38 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 7.19 which put DM Ursae Majoris at a distance of 453.63 light years or 139.08 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 28,687,109.36 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 7,470.00 Parsecs or 24,364.40 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of DM Ursae Majoris

The star is a eclipsing binary sys RS Canum Venaticorum variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. DM Ursae Majoris brightness ranges from a magnitude of 9.610 to a magnitude of 9.358 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 days (variability).

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.

Hide Explanations
Show GridLines

Additional DM Ursae Majoris Facts and Figures

Visual Facts


Primary / Proper / Traditional NameDM Ursae Majoris
Alternative NamesHIP 53425, BD+61 1211, DM UMa
Spectral TypeK0/K1III-IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationUrsa Major
Absolute Magnitude 3.58 / 3.57
Visual / Apparent Magnitude9.29
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)10h 55m 43.59
Declination (Dec.)+60° 28` 09.8
Galactic Latitude51.32 degrees
Galactic Longitude145.36 degrees
1997 Distance from Earth7.21 Parallax (milliarcseconds)
 452.38 Light Years
 138.70 Parsecs
2007 Distance from Earth7.19 Parallax (milliarcseconds)
 453.63 Light Years
 139.08 Parsecs
 28,687,109.36 Astronomical Units
Galacto-Centric Distance24,364.40 Light Years / 7,470.00 Parsecs
Proper Motion Dec.-7.51 ± 0.90 milliarcseconds/year
Proper Motion RA.-37.43 ± 1.28 milliarcseconds/year
B-V Index1.01
Radial Velocity-8.03 ± 0.29 km/s
Eccentricity0.02
Semi-Major Axis7600.00
Stellar Luminosity (Lsun)4.24

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeRS Canum Venaticorum
Mean Variability Period in Days0.211
Variable Magnitude Range (Brighter - Dimmer)9.358 - 9.610

Estimated Calculated Facts


Radius (x the Sun)2.58
Effective Temperature4,830 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

   
x
This website is using cookies. More info. That's Fine