4 Cygni

Below the horizon. Rise: 15:49 | Tran: 2:21 | Set: 12:48

Alt: -0.50° Az: 15.58° Direction: South

4 Cygni is a variable star of spectral class B9 in the constellation of Cygnus.

4 Cygni visual magnitude is 5.15. Because of its faintness, 4 Cygni is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of 4 Cygni. The red arrow shows the motion of 4 Cygni during the next 10000 years (0.83 arcmin in Right Ascension and 2.33 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 19h 27m 04s

Declination +36° 22’ 12”

Hour Angle 13h 17m 54s

Sidereal Time 08h 44m 59s

J2000

Right Ascension 19h 26m 09s

Declination +36° 19’ 04”

Galactic Coordinates

Galactic Longitude 69.11°

Galactic Latitude 9.31°

Finder Chart

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Finder chart for 4 Cygni.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.15

Class

4 Cygni is also a Si chemically peculiar star.

Absolute magnitude -1.36

Spectral Type B9

Color Index (B-V) -0.12

Temperature 11920K

The red dot in the diagram below shows where 4 Cygni is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 4 Cygni. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

4 Cygni is distant 653.31 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

Distance (parsec) 200.40

Distance (light year) 653.31

Radial Speed -22 km/s

Proper Motion RA 0.005 arcsec/y

Proper Motion Dec 0.014"/y

Alternative Designations

Flamsteed designation 4 Cygni

Henry Draper Catalogue HD183056

SAO Catalogue SAO68301

Hipparcos Catalogue HIP95556

Durchmusterung Catalogue BD+36 3557

FK5 Catalogue 3554

General Catalogue of Variable Stars V1741 Cyg

Visibility from Your Location

Today's 4 Cygni rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 53.6° RISE 15:49

Max altitude: 74.9° TRANSIT 2:21

Azimuth: 306.4° SET 12:48

Set Location

Other stars in Cygnus