25 Cygni

Altitude: 19.2° Azimuth: 54.1° Direction: North-East

25 Cygni is a variable sub-giant star in the constellation of Cygnus.

25 Cygni visual magnitude is 5.19. Because of its reltive faintness, 25 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 25 Cygni:

Color of 25 Cygni ⬤

Magnitude of 25 Cygni 5.19

Class Sub-giant

VISIBILITY RIGHT NOW

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

Altitude: 19.2°
Azimuth: 54.1°
Direction: North-East

Celestial coordinates and finder chart of 25 Cygni

25 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 25 Cygni are provided in the following table:

Right Ascension J2000 19h 59m 55s

Declination J2000 +37° 02’ 34”

Galactic Longitude 73.07°

Galactic Latitude 3.76°

Constellation Cygnus

The simplified sky map below shows the position of 25 Cygni in the sky:

Simplified finder chart for 25 Cygni.

Visibility of 25 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 25 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: 53.0° RISE 10:11

Max altitude: 75.6° TRANSIT 20:54

Azimuth: 307.0° SET 7:40

Digitized Sky Survey image of 25 Cygni

The image below is a photograph of 25 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 25 Cygni is 0.006 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

DSS2 image of 25 Cygni. The red arrow shows the motion of 25 Cygni during the next 100000 years (10.00 arcmin in Right Ascension and 1.67 arcmin in declination);

Distance of 25 Cygni from the Sun and relative movement

25 Cygni is distant 1,574.88 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

Distance (parsec) 483.09 pc

Distance (light year) 1,574.88 ly

Heliocentric radial velocity -4 km/s

Proper Motion RA 0.006 arcsec/year

Proper Motion Dec 0.001 arcsec/year

Spectral properties of 25 Cygni

25 Cygni belongs to spectral class B3 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude -3.23

Spectral Type B3IV

Color Index (B-V) -0.17

Temperature of 25 Cygni 12902K

The red dot in the diagram below shows where 25 Cygni is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 25 Cygni. Attribution: Richard Powell / CC BY-SA

Alternative designations of 25 Cygni

Flamsteed designation 25 Cygni

Henry Draper Catalogue HD189687

SAO Catalogue SAO69231

Hipparcos Catalogue HIP98425

Durchmusterung Catalogue BD+36 3806

FK5 Catalogue 3599

General Catalogue of Variable Stars V1746 Cyg

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