σ2 Ursae Majoris (sigma2 Ursae Majoris)

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

σ2 Ursae Majoris visual magnitude is 4.8. Because of its moderate brightness, σ2 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 σ2 Ursae Majoris:

Color of σ2 Ursae Majoris ⬤

Magnitude of σ2 Ursae Majoris 4.8

Class Sub-giant

VISIBILITY RIGHT NOW σ2 Ursae Majoris (sigma2 Ursae Majoris) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 29°.

Celestial coordinates and finder chart of σ2 Ursae Majoris

σ2 Ursae Majoris is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of σ2 Ursae Majoris are provided in the following table:

Right Ascension J2000 09h 10m 23s

Declination J2000 +67° 08’ 04”

Galactic Longitude 146.87°

Galactic Latitude 38.11°

Constellation Ursa Major

The simplified sky map below shows the position of σ2 Ursae Majoris in the sky:

Finder chart σ2 Ursae Majoris (sigma2 Ursae Majoris) star

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

Visibility of σ2 Ursae Majoris from your location

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

σ2 Ursae Majoris (sigma2 Ursae Majoris) is circumpolar and transits at 20:26 UTC (altitude: 74.3°)

Digitized Sky Survey image of σ2 Ursae Majoris

The image below is a photograph of σ2 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 σ2 Ursae Majoris is -0.02 arcsec per year in Right Ascension and -0.074 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

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);

Distance of σ2 Ursae Majoris from the Sun and relative movement

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 pc

Distance (light year) 66.71 ly

Heliocentric radial velocity -2 km/s

Proper Motion RA -0.02 arcsec/year

Proper Motion Dec -0.074 arcsec/year

Spectral properties of σ2 Ursae Majoris

σ2 Ursae Majoris belongs to spectral class F6 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 3.25

Spectral Type F6IV

Color Index (B-V) 0.49

Temperature of σ2 Ursae Majoris 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

σ2 Ursae Majoris 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

Alternative designations of σ2 Ursae Majoris

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

How to support us

In Evidence

Other stars in Ursa Major