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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Cetus » 

18 Ceti

Altitude: -45.4°   Azimuth: 319.7°   Direction: North-West

18 Ceti is a double hypergiant star in the constellation of Cetus.

18 Ceti visual magnitude is 6.15. Because of its reltive faintness, 18 Ceti 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 Ceti:

6.15
Hypergiant

18 Ceti is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -45.4°
Azimuth: 319.7°
Direction: North-West

Celestial coordinates and finder chart of 18 Ceti

18 Ceti is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 18 Ceti are provided in the following table:

00h 45m 28s
-12° 52’ 50”
117.05°
-75.68°
Cetus

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

Finder chart 18 Ceti star
Simplified finder chart for 18 Ceti.

Visibility of 18 Ceti 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 18 Ceti 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: 102.9°
Max altitude: 25.6°
Azimuth: 257.1°

Digitized Sky Survey image of 18 Ceti

The image below is a photograph of 18 Ceti 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 Ceti is -0.034 arcsec per year in Right Ascension and -0.201 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 18 Ceti star
DSS2 image of 18 Ceti. The red arrow shows the motion of 18 Ceti during the next 1000 years (-0.57 arcmin in Right Ascension and -3.35 arcmin in declination);

Distance of 18 Ceti from the Sun and relative movement

18 Ceti is distant 103.85 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

31.86 pc
103.85 ly
-13 km/s
-0.034 arcsec/year
-0.201 arcsec/year

Spectral properties of 18 Ceti

18 Ceti belongs to spectral class G0 and has a luminosity class of V corresponding to a hypergiant star.

3.63
G0V
5929K

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

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

18 Ceti star system properties

18 Ceti 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 18 Ceti double sysyem:

6.15
12.45
6.3
69.5 arcsec

Alternative designations of 18 Ceti

SAO147432
SAO147432