Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:50  
clear_day Transit: 12:56  
SunsetSet: 21:02 south
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All Constellations » Cygnus » 

Azelfafage - π1 Cygni (pi1 Cygni)

Azelfafage, also designated as π1 Cygni (pi1 Cygni), is a sub-giant star in the constellation of Cygnus.

Azelfafage visual magnitude is 4.67. Because of its moderate brightness, Azelfafage should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about Azelfafage:

Azelfafage - π1 Cygni (pi1 Cygni) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 82°.

Celestial coordinates and finder chart of Azelfafage

Azelfafage 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 Azelfafage are provided in the following table:

21h 42m 05s
+51° 11’ 22”

The simplified sky map below shows the position of Azelfafage in the sky:

Finder chart Azelfafage - π1 Cygni (pi1 Cygni) star
Simplified finder chart for Azelfafage - π1 Cygni (pi1 Cygni).

Visibility of Azelfafage from your location

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

Azelfafage - π1 Cygni (pi1 Cygni) is circumpolar and transits at 05:12 UTC (altitude: 89.7°)

Digitized Sky Survey image of Azelfafage

The image below is a photograph of Azelfafage from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of Azelfafage is 0.006 arcsec per year in Right Ascension and -0.006 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of Azelfafage - π1 Cygni (pi1 Cygni) star
DSS2 image of Azelfafage. The red arrow shows the motion of Azelfafage during the next 100000 years (10.00 arcmin in Right Ascension and -10.00 arcmin in declination);

Distance of Azelfafage from the Sun and relative movement

Azelfafage is distant 1,680.41 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

515.46 pc
1,680.41 ly
-8 km/s
0.006 arcsec/year
-0.006 arcsec/year

Spectral properties of Azelfafage

Azelfafage belongs to spectral class B3 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

Alternative designations of Azelfafage

π1 Cygni
(pi1 Cygni)