θ Ursae Majoris (theta Ursae Majoris)

Altitude: 21.5° Azimuth: 30.7° Direction: North-North-East

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:

Color of θ Ursae Majoris ⬤

Magnitude of θ Ursae Majoris 3.17

Class Sub-giant

VISIBILITY RIGHT NOW

θ Ursae Majoris (theta Ursae Majoris) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 21.5°
Azimuth: 30.7°
Direction: North-North-East

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:

Right Ascension J2000 09h 32m 51s

Declination J2000 +51° 40’ 37”

Galactic Longitude 165.45°

Galactic Latitude 45.66°

Constellation Ursa Major

The simplified sky map below shows the position of θ Ursae Majoris in the sky:

Finder chart θ Ursae Majoris (theta Ursae Majoris) star

Simplified finder chart for θ Ursae Majoris (theta Ursae Majoris).

Visibility of θ Ursae Majoris from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

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.

Image of θ Ursae Majoris (theta Ursae Majoris) star

DSS2 image of θ Ursae Majoris. The red arrow shows the motion of θ Ursae Majoris during the next 100 years (-1.59 arcmin in Right Ascension and -0.89 arcmin in declination);

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.

Distance (parsec) 13.49 pc

Distance (light year) 43.96 ly

Heliocentric radial velocity 15 km/s

Proper Motion RA -0.954 arcsec/year

Proper Motion Dec -0.531 arcsec/year

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.

Absolute magnitude 2.52

Spectral Type F6IV

Color Index (B-V) 0.46

Temperature of θ Ursae Majoris 6576K

The red dot in the diagram below shows where θ Ursae Majoris is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of θ Ursae Majoris. Attribution: Richard Powell / CC BY-SA

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:

Main star magnitude 3.17

Secondary star magnitude 13.87

Magnitude difference 10.7

Separation 4.1 arcsec

Alternative designations of θ Ursae Majoris

Bayer designation θ Ursae Majoris
(theta Ursae Majoris)

Flamsteed designation 25 Ursae Majoris

Henry Draper Catalogue HD82328

SAO Catalogue SAO27289

Hipparcos Catalogue HIP46853

Durchmusterung Catalogue BD+52 1401

Gliese Catalogue Gl 354 A

FK5 Catalogue 358

General Catalogue of Variable Stars 4519

Aitken Double Star Catalogue ADS7420

In Evidence

Other stars in Ursa Major