18 Cephei

Altitude: 78.2° Azimuth: 353.2° Direction: North

18 Cephei is a variable giant star in the constellation of Cepheus.

18 Cephei visual magnitude is 5.29. Because of its reltive faintness, 18 Cephei 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 18 Cephei:

Color of 18 Cephei ⬤

Magnitude of 18 Cephei 5.29

Class Giant

VISIBILITY RIGHT NOW

18 Cephei is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 78.2°
Azimuth: 353.2°
Direction: North

Celestial coordinates and finder chart of 18 Cephei

18 Cephei is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 18 Cephei are provided in the following table:

Right Ascension J2000 22h 03m 52s

Declination J2000 +63° 07’ 10”

Galactic Longitude 105.26°

Galactic Latitude 6.15°

Constellation Cepheus

The simplified sky map below shows the position of 18 Cephei in the sky:

Simplified finder chart for 18 Cephei.

Visibility of 18 Cephei from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

18 Cephei is circumpolar and transits at 16:59 UTC (altitude: 78.4°)

Digitized Sky Survey image of 18 Cephei

The image below is a photograph of 18 Cephei 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 18 Cephei is 0.031 arcsec per year in Right Ascension and 0.055 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 18 Cephei. The red arrow shows the motion of 18 Cephei during the next 10000 years (5.17 arcmin in Right Ascension and 9.17 arcmin in declination);

Distance of 18 Cephei from the Sun and relative movement

18 Cephei is distant 448.42 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

Distance (parsec) 137.55 pc

Distance (light year) 448.42 ly

Heliocentric radial velocity -4 km/s

Proper Motion RA 0.031 arcsec/year

Proper Motion Dec 0.055 arcsec/year

Spectral properties of 18 Cephei

18 Cephei belongs to spectral class M5 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -0.40

Spectral Type M5III

Color Index (B-V) 1.58

Temperature of 18 Cephei 3677K

The red dot in the diagram below shows where 18 Cephei is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 18 Cephei. Attribution: Richard Powell / CC BY-SA

Alternative designations of 18 Cephei

Flamsteed designation 18 Cephei

Henry Draper Catalogue HD209772

SAO Catalogue SAO19828

Hipparcos Catalogue HIP108924

Durchmusterung Catalogue BD+62 2028

General Catalogue of Variable Stars MO Cep

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