σ2 Ursae Majoris (sigma2 Ursae Majoris)

Above the horizon. Circumpolar today

Alt: 41.48° Az: 30.38° Direction: North-North-East

σ2 Ursae Majoris is a variable and multiple sub-giant star of spectral class F6 in the constellation of Ursa Major.

σ2 Ursae Majoris visual magnitude is 4.8. Because of its moderate brightness, σ2 Ursae Majoris is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Image of σ2 Ursae Majoris (sigma2 Ursae Majoris) star

DSS2 image of σ2 Ursae Majoris. The red arrow shows the motion of σ2 Ursae Majoris during the next 10000 years (-3.33 arcmin in Right Ascension and -12.33 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 09h 12m 31s

Declination +67° 01’ 56”

Hour Angle 17h 04m 46s

Sidereal Time 02h 17m 18s

J2000

Right Ascension 09h 10m 23s

Declination +67° 08’ 04”

Galactic Coordinates

Galactic Longitude 146.87°

Galactic Latitude 38.11°

Finder Chart

Simplified finder chart for σ2 Ursae Majoris (sigma2 Ursae Majoris).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.8

Class Sub-giant

Absolute magnitude 3.25

Spectral Type F6IV

Color Index (B-V) 0.49

Temperature 6435K

The red dot in the diagram below shows where σ2 Ursae Majoris is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of σ2 Ursae Majoris. Attribution: Richard Powell / CC BY-SA

Star System Properties

σ2 Ursae Majoris is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the σ2 Ursae Majoris double sysyem:

Main star magnitude 4.8

Secondary star magnitude 8.3

Magnitude difference 3.5

Separation 2.8 arcsec

Distance, Radial Speed, Proper Motion

σ2 Ursae Majoris is distant 66.71 light years from the Sun and it is moving towards the Sun at the speed of 2 kilometers per second.

Distance (parsec) 20.46

Distance (light year) 66.71

Radial Speed -2 km/s

Proper Motion RA -0.02 arcsec/y

Proper Motion Dec -0.074"/y

Alternative Designations

Bayer designation σ2 Ursae Majoris
(sigma2 Ursae Majoris)

Flamsteed designation 13 Ursae Majoris

Henry Draper Catalogue HD78154

SAO Catalogue SAO14788

Hipparcos Catalogue HIP45038

Durchmusterung Catalogue BD+67 577

Gliese Catalogue Gl 335 A

General Catalogue of Variable Stars 4392

Aitken Double Star Catalogue ADS7203

Visibility from Your Location

σ2 Ursae Majoris (sigma2 Ursae Majoris) is circumpolar and transits at 07:43 UTC (altitude: 74.4°)

Set Location

Other stars in Ursa Major