4 Cygni

Altitude: 29.8° Azimuth: 292.2° Direction: West-North-West

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

4 Cygni visual magnitude is 5.15. Because of its reltive faintness, 4 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 4 Cygni:

Color of 4 Cygni ⬤

Magnitude of 4 Cygni 5.15

Class

VISIBILITY RIGHT NOW

4 Cygni is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 29.8°
Azimuth: 292.2°
Direction: West-North-West

Celestial coordinates and finder chart of 4 Cygni

4 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 4 Cygni are provided in the following table:

Right Ascension J2000 19h 26m 09s

Declination J2000 +36° 19’ 04”

Galactic Longitude 69.11°

Galactic Latitude 9.31°

Constellation Cygnus

The simplified sky map below shows the position of 4 Cygni in the sky:

Simplified finder chart for 4 Cygni.

Visibility of 4 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 4 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: 53.7° RISE 3:39

Max altitude: 74.8° TRANSIT 14:06

Azimuth: 306.3° SET 0:36

Digitized Sky Survey image of 4 Cygni

The image below is a photograph of 4 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 4 Cygni is 0.005 arcsec per year in Right Ascension and 0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

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);

Distance of 4 Cygni from the Sun and relative movement

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 pc

Distance (light year) 653.31 ly

Heliocentric radial velocity -22 km/s

Proper Motion RA 0.005 arcsec/year

Proper Motion Dec 0.014 arcsec/year

Spectral properties of 4 Cygni

4 Cygni belongs to spectral class B9 4 Cygni is also a Si chemically peculiar star.

Absolute magnitude -1.36

Spectral Type B9

Color Index (B-V) -0.12

Temperature of 4 Cygni 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

Alternative designations of 4 Cygni

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

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Other stars in Cygnus