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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:44  
clear_day Transit: 12:10  
SunsetSet: 17:38
sleep NighttimeWhat's Visible Now?
All Constellations » Cygnus » 

λ Cygni (lambda Cygni)

Altitude: 0.6°   Azimuth: 340.3°   Direction: North-North-West

λ Cygni is a multiple main-sequence star in the constellation of Cygnus.

λ Cygni visual magnitude is 4.53. Because of its moderate brightness, λ Cygni 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 Cygni is 0.009 arcsec per year in Right Ascension and -0.005 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of λ Cygni (lambda Cygni) star
DSS2 image of λ Cygni. The red arrow shows the motion of λ Cygni during the next 100000 years (15.00 arcmin in Right Ascension and -8.33 arcmin in declination);

Key facts about λ Cygni

4.53
Main-sequence

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

Altitude: 0.6°
Azimuth: 340.3°
Direction: North-North-West

Celestial coordinates and finder chart of λ Cygni

λ Cygni 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 Cygni are provided in the following table:

20h 47m 24s
+36° 29’ 26”
78.08°
-4.34°
Cygnus

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

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

Visibility of λ Cygni from your location

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

Today's λ Cygni (lambda Cygni) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 53.5°
Max altitude: 75.0°
Azimuth: 306.5°

Distance of λ Cygni from the Sun and relative movement

λ Cygni is distant 878.71 light years from the Sun and it is moving towards the Sun at the speed of 23 kilometers per second.

269.54 pc
878.71 ly
-23 km/s
0.009 arcsec/year
-0.005 arcsec/year

Spectral properties of λ Cygni

λ Cygni belongs to spectral class B5 and has a luminosity class of V corresponding to a main-sequence star.

-2.62
B5V
11744K

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

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

λ Cygni star system properties

λ Cygni is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the λ Cygni double sysyem:

4.53
5.83
1.3
0.9 arcsec

Alternative designations of λ Cygni

λ Cygni
(lambda Cygni)
SAO70505
SAO70505