θ Ursae Majoris (theta Ursae Majoris)
θ Ursae Majoris is a variable and double sub-giant star in the constellation of Ursa Major.
θ Ursae Majoris visual magnitude is 3.17. Because of its moderate brightness, θ Ursae Majoris should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.
The table below summarizes the key facts about θ Ursae Majoris:
θ Ursae Majoris (theta Ursae Majoris) is above the horizon from Greenwich, United Kingdom .
Celestial coordinates and finder chart of θ Ursae Majoris
θ Ursae Majoris is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of θ Ursae Majoris are provided in the following table:
The simplified sky map below shows the position of θ Ursae Majoris in the sky:
Visibility of θ Ursae Majoris from your location
Location: Greenwich, United Kingdom
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
θ Ursae Majoris (theta Ursae Majoris) is circumpolar and transits at 16:41 UTC (altitude: 89.8°)
Digitized Sky Survey image of θ Ursae Majoris
The image below is a photograph of θ Ursae Majoris from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of θ Ursae Majoris is -0.954 arcsec per year in Right Ascension and -0.531 arcsec per year in Declination and the associated displacement for the next 100 years is represented with the red arrow.
Distance of θ Ursae Majoris from the Sun and relative movement
θ Ursae Majoris is distant 43.96 light years from the Sun and it is moving far from the Sun at the speed of 15 kilometers per second.
Spectral properties of θ Ursae Majoris
θ Ursae Majoris belongs to spectral class F6 and has a luminosity class of IV corresponding to a sub-giant star.
The red dot in the diagram below shows where θ Ursae Majoris is situated in the Hertzsprung–Russell diagram.
θ Ursae Majoris star system properties
θ Ursae Majoris is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the θ Ursae Majoris double sysyem: