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public  Greenwich, UK Greenwich, UK  ⓘ
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Sunrise: 7:10 
Transit: 12:13 
Sunset: 17:18
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All Constellations » Ursa Major » 

Alkaphrah - κ Ursae Majoris (kappa Ursae Majoris)

Above the horizon.  Circumpolar today
Alt: 33.98°   Az: 304.80°   Direction: North-West

Alkaphrah, also designated as κ Ursae Majoris (kappa Ursae Majoris), is a variable and double main-sequence star of spectral class A1 in the constellation of Ursa Major.

Alkaphrah visual magnitude is 3.6. Because of its moderate brightness, Alkaphrah 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 Alkaphrah - κ Ursae Majoris (kappa Ursae Majoris) star
DSS2 image of Alkaphrah. The red arrow shows the motion of Alkaphrah during the next 10000 years (-5.50 arcmin in Right Ascension and -9.00 arcmin in declination);

Celestial Coordinates

Apparent

09h 05m 19s
+47° 03’ 20”
06h 07m 29s
15h 12m 49s

J2000

09h 03m 37s
+47° 09’ 24”

Galactic Coordinates

172.63°
41.63°

Finder Chart

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Finder chart for Alkaphrah - κ Ursae Majoris (kappa Ursae Majoris).

Magnitude, Color, Spectral Class

3.6
Main-sequence

-1.96
A1V
10125K

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

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

Star System Properties

Alkaphrah 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 Alkaphrah double sysyem:

3.6
3.8
0.2
0.3 arcsec

Distance, Radial Speed, Proper Motion

Alkaphrah is distant 422.83 light years from the Sun and it is moving far from the Sun at the speed of 4 kilometers per second.

129.70
422.83
4 km/s
-0.033 arcsec/y
-0.054"/y

Alternative Designations

Alkaphrah
κ Ursae Majoris
(kappa Ursae Majoris)
12 Ursae Majoris
SAO42661
SAO42661

Visibility from Your Location

Alkaphrah - κ Ursae Majoris (kappa Ursae Majoris) is circumpolar and transits at 23:12 UTC (altitude: 85.6°)