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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 7:12 
Transit: 12:14 
Sunset: 17:16
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All Constellations » Perseus » 

δ Persei (delta Persei)

Above the horizon.  Circumpolar today
Alt: 17.31°   Az: 31.17°   Direction: North-North-East

δ Persei is a variable and double giant star of spectral class B5 in the constellation of Perseus.

δ Persei visual magnitude is 3.01. Because of its moderate brightness, δ Persei 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 δ Persei (delta Persei) star
DSS2 image of δ Persei. The red arrow shows the motion of δ Persei during the next 10000 years (4.67 arcmin in Right Ascension and -5.67 arcmin in declination);

Celestial Coordinates

Apparent

03h 44m 43s
+47° 51’ 56”
15h 09m 45s
18h 54m 28s

J2000

03h 42m 55s
+47° 47’ 15”

Galactic Coordinates

150.28°
-5.77°

Finder Chart

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Finder chart for δ Persei (delta Persei).

Magnitude, Color, Spectral Class

3.01
Giant

-3.04
B5III
12103K

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

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

Star System Properties

δ Persei 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 δ Persei double sysyem:

3.01
10.31
7.3
99.1 arcsec

Distance, Radial Speed, Proper Motion

δ Persei is distant 527.51 light years from the Sun and it is moving far from the Sun at the speed of 4 kilometers per second.

161.81
527.51
4 km/s
0.028 arcsec/y
-0.034"/y

Alternative Designations

δ Persei
(delta Persei)
SAO39053
SAO39053

Visibility from Your Location

δ Persei (delta Persei) is circumpolar and transits at 17:56 UTC (altitude: 86.4°)