Universe Guide

U Arietis

U Arietis Facts

U Arietis's Alternative Names

The Id of the star in the Henry Draper catalogue is HD19737.

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

Location of U Arietis

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 object is compared to the celestial equator and is expressed in degrees. For U Arietis, the location is 03 11 03.0379089579 and +14 48 00.311868732 .

Radial Velocity and Proper Motion of U Arietis

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 -9.26 milliarcseconds/year towards the north and 5.82 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 -37.00 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 U Arietis

U Arietis Colour and Temperature

U Arietis has a spectral type of M4.5-7.5e. This means the star is a red star.

Distance to U Arietis

The Parallax of the star is given as 0.97 which gives a calculated distance to U Arietis of 3378.18 light years from the Earth or 1035.73 parsecs. It would take a spaceship travelling at the speed of light, 3378.18 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 213,633,159.16 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.

Variable Type of U Arietis

The star is a pulsating Omicron Ceti 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.

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Additional U Arietis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameU Arietis
Alternative NamesHD 19737
Spectral TypeM4.5-7.5e
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
GalaxyMilky Way
Right Ascension (R.A.)03 11 03.0379089579
Declination (Dec.)+14 48 00.311868732
Distance from Earth0.97 Parallax (milliarcseconds)
 3378.18 Light Years
 1035.73 Parsecs
 213,633,159.16 Astronomical Units
Proper Motion Dec.-9.26 milliarcseconds/year
Proper Motion RA.5.82 milliarcseconds/year
Radial Velocity-37.00 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeOmicron Ceti

Sources and Links


Related Stars

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