77 Cygni
77 Cygni is a double hypergiant star in the constellation of Cygnus.
77 Cygni visual magnitude is 5.69. Because of its reltive faintness, 77 Cygni should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.
The table below summarizes the key facts about 77 Cygni:
Celestial coordinates and finder chart of 77 Cygni
77 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 77 Cygni are provided in the following table:
The simplified sky map below shows the position of 77 Cygni in the sky:
Visibility of 77 Cygni from your location
Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London
77 Cygni is circumpolar and transits at 12:25 UTC (altitude: 79.6°)
Digitized Sky Survey image of 77 Cygni
The image below is a photograph of 77 Cygni 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 77 Cygni is 0.021 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of 77 Cygni from the Sun and relative movement
77 Cygni is distant 372.15 light years from the Sun and it is moving towards the Sun at the speed of 25 kilometers per second.
Spectral properties of 77 Cygni
77 Cygni belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.
The red dot in the diagram below shows where 77 Cygni is situated in the Hertzsprung–Russell diagram.
77 Cygni star system properties
77 Cygni 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 77 Cygni double sysyem: