θ Cygni (theta Cygni)

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

θ Cygni visual magnitude is 4.48. Because of its moderate brightness, θ Cygni 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 θ Cygni:

Color of θ Cygni ⬤

Magnitude of θ Cygni 4.48

Class Main-sequence

VISIBILITY RIGHT NOW θ Cygni (theta Cygni) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 15°.

Celestial coordinates and finder chart of θ Cygni

θ 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 θ Cygni are provided in the following table:

Right Ascension J2000 19h 36m 26s

Declination J2000 +50° 13’ 15”

Galactic Longitude 82.66°

Galactic Latitude 13.85°

Constellation Cygnus

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

Simplified finder chart for θ Cygni (theta Cygni).

Visibility of θ Cygni from your location

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

θ Cygni (theta Cygni) is circumpolar and transits at 02:55 UTC (altitude: 88.7°)

Digitized Sky Survey image of θ Cygni

The image below is a photograph of θ 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 θ Cygni is -0.017 arcsec per year in Right Ascension and 0.257 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of θ Cygni. The red arrow shows the motion of θ Cygni during the next 1000 years (-0.28 arcmin in Right Ascension and 4.28 arcmin in declination);

Distance of θ Cygni from the Sun and relative movement

θ Cygni is distant 60.62 light years from the Sun and it is moving towards the Sun at the speed of 28 kilometers per second.

Distance (parsec) 18.59 pc

Distance (light year) 60.62 ly

Heliocentric radial velocity -28 km/s

Proper Motion RA -0.017 arcsec/year

Proper Motion Dec 0.257 arcsec/year

Spectral properties of θ Cygni

θ Cygni belongs to spectral class F4 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 3.13

Spectral Type F4V

Color Index (B-V) 0.38

Temperature of θ Cygni 6989K

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

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

θ Cygni star system properties

θ 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 θ Cygni double sysyem:

Main star magnitude 4.48

Secondary star magnitude 11.38

Magnitude difference 6.9

Separation 48.4 arcsec

Alternative designations of θ Cygni

Bayer designation θ Cygni
(theta Cygni)

Flamsteed designation 13 Cygni

Henry Draper Catalogue HD185395

SAO Catalogue SAO31815

Hipparcos Catalogue HIP96441

Durchmusterung Catalogue BD+49 3062

Gliese Catalogue Gl 765 A

FK5 Catalogue 738

Aitken Double Star Catalogue ADS12695

In Evidence

Other stars in Cygnus