Deneb - α Cygni (alpha Cygni)
Deneb, also designated as α Cygni (alpha Cygni), is a variable and double supergiant star in the constellation of Cygnus.
Deneb visual magnitude is 1.25, making it the 18th brightest star in the sky. Thanks to its high brightness, Deneb is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.
The table below summarizes the key facts about Deneb:
Deneb - α Cygni (alpha Cygni) is above the horizon from Greenwich, United Kingdom .
Celestial coordinates and finder chart of Deneb
Deneb 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 Deneb are provided in the following table:
The simplified sky map below shows the position of Deneb in the sky:
Visibility of Deneb from your location
Location: Greenwich, United Kingdom
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Deneb - α Cygni (alpha Cygni) is circumpolar and transits at 03:40 UTC (altitude: 83.8°)
Digitized Sky Survey image of Deneb
The image below is a photograph of Deneb 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 Deneb is 0.003 arcsec per year in Right Ascension and 0.002 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.
Distance of Deneb from the Sun and relative movement
Deneb is distant 3,227.72 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.
Spectral properties of Deneb
Deneb belongs to spectral class A2 and has a luminosity class of I corresponding to a supergiant star.
The red dot in the diagram below shows where Deneb is situated in the Hertzsprung–Russell diagram.
Deneb star system properties
Deneb 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 Deneb double sysyem: