We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Donate Now! Help keep this site free and ads-free!
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:04  
clear_day Transit: 12:06  
SunsetSet: 18:09
sleep NighttimeWhat's Visible Now?
All Constellations » Perseus » 

λ Persei (lambda Persei)

Altitude: 13.4°   Azimuth: 346.3°   Direction: North-North-West

λ Persei is a hypergiant star in the constellation of Perseus.

λ Persei visual magnitude is 4.29. Because of its moderate brightness, λ Persei should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of λ Persei is -0.015 arcsec per year in Right Ascension and -0.036 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of λ Persei (lambda Persei) star
DSS2 image of λ Persei. The red arrow shows the motion of λ Persei during the next 10000 years (-2.50 arcmin in Right Ascension and -6.00 arcmin in declination);

Key facts about λ Persei

4.29
Hypergiant

λ Persei (lambda Persei) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 13.4°
Azimuth: 346.3°
Direction: North-North-West

Celestial coordinates and finder chart of λ Persei

λ Persei is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of λ Persei are provided in the following table:

04h 06m 34s
+50° 21’ 05”
151.63°
-1.32°
Perseus

The simplified sky map below shows the position of λ Persei in the sky:

Finder chart λ Persei (lambda Persei) star
Simplified finder chart for λ Persei (lambda Persei).

Visibility of λ Persei from your location

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

λ Persei (lambda Persei) is circumpolar and transits at 16:15 UTC (altitude: 88.9°)

Distance of λ Persei from the Sun and relative movement

λ Persei is distant 346.44 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

106.27 pc
346.44 ly
6 km/s
-0.015 arcsec/year
-0.036 arcsec/year

Spectral properties of λ Persei

λ Persei belongs to spectral class A0 and has a luminosity class of IV corresponding to a hypergiant star.

-0.84
A0IV
9882K

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

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

Alternative designations of λ Persei

λ Persei
(lambda Persei)
SAO24412
SAO24412