υ Cygni (upsilon Cygni)

υ Cygni is a variable and multiple main-sequence star in the constellation of Cygnus.

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

Color of υ Cygni ⬤

Magnitude of υ Cygni 4.43

Class Main-sequence

VISIBILITY RIGHT NOW υ Cygni (upsilon Cygni) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 51°.

Celestial coordinates and finder chart of υ Cygni

υ 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 υ Cygni are provided in the following table:

Right Ascension J2000 21h 17m 55s

Declination J2000 +34° 53’ 48”

Galactic Longitude 80.98°

Galactic Latitude -10.05°

Constellation Cygnus

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

Finder chart υ Cygni (upsilon Cygni) star

Simplified finder chart for υ Cygni (upsilon Cygni).

Visibility of υ 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 υ Cygni (upsilon 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: 55.1° RISE 19:26

Max altitude: 73.4° TRANSIT 5:32

Azimuth: 304.9° SET 15:33

RIGHT NOW υ Cygni (upsilon Cygni) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of υ Cygni

The image below is a photograph of υ 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 υ Cygni is 0.014 arcsec per year in Right Ascension and -0.002 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of υ Cygni. The red arrow shows the motion of υ Cygni during the next 10000 years (2.33 arcmin in Right Ascension and -0.33 arcmin in declination);

Distance of υ Cygni from the Sun and relative movement

υ Cygni is distant 900.55 light years from the Sun and it is moving far from the Sun at the speed of 4 kilometers per second.

Distance (parsec) 276.24 pc

Distance (light year) 900.55 ly

Heliocentric radial velocity 4 km/s

Proper Motion RA 0.014 arcsec/year

Proper Motion Dec -0.002 arcsec/year

Spectral properties of υ Cygni

υ Cygni belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -2.78

Spectral Type B2V

Color Index (B-V) -0.11

Temperature of υ Cygni 11744K

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

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

υ Cygni star system properties

υ 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 υ Cygni double sysyem:

Main star magnitude 4.43

Secondary star magnitude 10.83

Magnitude difference 6.4

Separation 15.3 arcsec

Alternative designations of υ Cygni

Bayer designation υ Cygni
(upsilon Cygni)

Flamsteed designation 66 Cygni

Henry Draper Catalogue HD202904

SAO Catalogue SAO71173

Hipparcos Catalogue HIP105138

Durchmusterung Catalogue BD+34 4371

FK5 Catalogue 1559

General Catalogue of Variable Stars Ups Cyg

Aitken Double Star Catalogue ADS14831

In Evidence

Other stars in Cygnus