39 Cygni

39 Cygni is a giant star in the constellation of Cygnus.

39 Cygni visual magnitude is 4.43. Because of its moderate brightness, 39 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 39 Cygni:

Color of 39 Cygni ⬤

Magnitude of 39 Cygni 4.43

Class Giant

VISIBILITY RIGHT NOW 39 Cygni is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 28°.

Celestial coordinates and finder chart of 39 Cygni

39 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 39 Cygni are provided in the following table:

Right Ascension J2000 20h 23m 51s

Declination J2000 +32° 11’ 23”

Galactic Longitude 71.72°

Galactic Latitude -3.02°

Constellation Cygnus

The simplified sky map below shows the position of 39 Cygni in the sky:

Simplified finder chart for 39 Cygni.

Visibility of 39 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 39 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: 57.8° RISE 19:28

Max altitude: 70.7° TRANSIT 4:58

Azimuth: 302.2° SET 14:24

RIGHT NOW 39 Cygni is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 39 Cygni

The image below is a photograph of 39 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 39 Cygni is 0.049 arcsec per year in Right Ascension and -0.005 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 39 Cygni. The red arrow shows the motion of 39 Cygni during the next 10000 years (8.17 arcmin in Right Ascension and -0.83 arcmin in declination);

Distance of 39 Cygni from the Sun and relative movement

39 Cygni is distant 255.29 light years from the Sun and it is moving towards the Sun at the speed of 15 kilometers per second.

Distance (parsec) 78.31 pc

Distance (light year) 255.29 ly

Heliocentric radial velocity -15 km/s

Proper Motion RA 0.049 arcsec/year

Proper Motion Dec -0.005 arcsec/year

Spectral properties of 39 Cygni

39 Cygni belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -0.04

Spectral Type K2III

Color Index (B-V) 1.33

Temperature of 39 Cygni 4069K

The red dot in the diagram below shows where 39 Cygni is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 39 Cygni. Attribution: Richard Powell / CC BY-SA

Alternative designations of 39 Cygni

Flamsteed designation 39 Cygni

Henry Draper Catalogue HD194317

SAO Catalogue SAO69950

Hipparcos Catalogue HIP100587

Durchmusterung Catalogue BD+31 4062

FK5 Catalogue 3633

In Evidence

Other stars in Cygnus