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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:06 
Transit: 12:56 
Sunset: 20:47
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All Constellations » Ursa Major » 

Mizar - ζ Ursae Majoris (zeta Ursae Majoris)

Above the horizon.  Circumpolar today
Alt: 19.50°   Az: 341.25°   Direction: North-North-West

Mizar, also designated as ζ Ursae Majoris (zeta Ursae Majoris), is a variable and multiple main-sequence star of spectral class A1 in the constellation of Ursa Major.

Mizar visual magnitude is 2.27, making it the 73th brightest star in the sky. Because of its brightness, Mizar is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Image of Mizar - ζ Ursae Majoris (zeta Ursae Majoris) star
DSS2 image of Mizar. The red arrow shows the motion of Mizar during the next 1000 years (2.03 arcmin in Right Ascension and -0.33 arcmin in declination);

Celestial Coordinates

Apparent

13h 24m 56s
+54° 47’ 36”
09h 53m 10s
23h 18m 06s

J2000

13h 23m 55s
+54° 55’ 31”

Galactic Coordinates

113.11°
61.58°

Finder Chart

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Finder chart for Mizar - ζ Ursae Majoris (zeta Ursae Majoris).

Magnitude, Color, Spectral Class

2.27
Main-sequence
Mizar is also a SrSi chemically peculiar star.

0.37
A1V
9882K

The red dot in the diagram below shows where Mizar is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of Mizar. Attribution: Richard Powell / CC BY-SA

Star System Properties

Mizar 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 Mizar double sysyem:

2.27
3.97
1.7
0 arcsec

Distance, Radial Speed, Proper Motion

Mizar is distant 78.12 light years from the Sun and it is moving towards the Sun at the speed of 6 kilometers per second.

23.96
78.12
-6 km/s
0.122 arcsec/y
-0.02"/y

Alternative Designations

Mizar
ζ Ursae Majoris
(zeta Ursae Majoris)
79 Ursae Majoris
SAO28737
SAO28737
NN 3783 A

Visibility from Your Location

Mizar - ζ Ursae Majoris (zeta Ursae Majoris) is circumpolar and transits at 21:41 UTC (altitude: 86.7°)