μ1 Cygni (mu1 Cygni)

μ1 Cygni is a multiple main-sequence star in the constellation of Cygnus.

μ1 Cygni visual magnitude is 4.73. Because of its moderate brightness, μ1 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 μ1 Cygni:

Color of μ1 Cygni ⬤

Magnitude of μ1 Cygni 4.73

Class Main-sequence

VISIBILITY RIGHT NOW μ1 Cygni (mu1 Cygni) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of μ1 Cygni

μ1 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 μ1 Cygni are provided in the following table:

Right Ascension J2000 21h 44m 08s

Declination J2000 +28° 44’ 34”

Galactic Longitude 80.58°

Galactic Latitude -18.34°

Constellation Cygnus

The simplified sky map below shows the position of μ1 Cygni in the sky:

Simplified finder chart for μ1 Cygni (mu1 Cygni).

Visibility of μ1 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 μ1 Cygni (mu1 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: 61.3° RISE 21:11

Max altitude: 67.3° TRANSIT 6:06

Azimuth: 298.7° SET 14:57

RIGHT NOW μ1 Cygni (mu1 Cygni) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of μ1 Cygni

The image below is a photograph of μ1 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 μ1 Cygni is 0.292 arcsec per year in Right Ascension and -0.241 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of μ1 Cygni. The red arrow shows the motion of μ1 Cygni during the next 1000 years (4.87 arcmin in Right Ascension and -4.02 arcmin in declination);

Distance of μ1 Cygni from the Sun and relative movement

μ1 Cygni is distant 73.03 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

Distance (parsec) 22.40 pc

Distance (light year) 73.03 ly

Heliocentric radial velocity 18 km/s

Proper Motion RA 0.292 arcsec/year

Proper Motion Dec -0.241 arcsec/year

Spectral properties of μ1 Cygni

μ1 Cygni belongs to spectral class F6 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 2.98

Spectral Type F6V

Color Index (B-V) 0.48

Temperature of μ1 Cygni 6481K

The red dot in the diagram below shows where μ1 Cygni is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of μ1 Cygni. Attribution: Richard Powell / CC BY-SA

μ1 Cygni star system properties

μ1 Cygni is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the μ1 Cygni double sysyem:

Main star magnitude 4.73

Secondary star magnitude 6.03

Magnitude difference 1.3

Separation 2 arcsec

Alternative designations of μ1 Cygni

Bayer designation μ1 Cygni
(mu1 Cygni)

Flamsteed designation 78 Cygni

Henry Draper Catalogue HD206826

SAO Catalogue SAO89940

Hipparcos Catalogue HIP107310

Durchmusterung Catalogue BD+28 4169

Gliese Catalogue Gl 836.6A

Aitken Double Star Catalogue ADS15270

In Evidence

Other stars in Cygnus