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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
SunriseRise: 6:44  
clear_day Transit: 12:10  
SunsetSet: 17:38
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All Constellations » Cetus » 

39 Ceti

Altitude: 3.2°   Azimuth: 261.9°   Direction: West

39 Ceti is a variable and double giant star in the constellation of Cetus.

39 Ceti visual magnitude is 5.41. Because of its reltive faintness, 39 Ceti should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of 39 Ceti is -0.104 arcsec per year in Right Ascension and -0.063 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 39 Ceti star
DSS2 image of 39 Ceti. The red arrow shows the motion of 39 Ceti during the next 1000 years (-1.73 arcmin in Right Ascension and -1.05 arcmin in declination);

Key facts about 39 Ceti


39 Ceti is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 3.2°
Azimuth: 261.9°
Direction: West

Celestial coordinates and finder chart of 39 Ceti

39 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 39 Ceti are provided in the following table:

01h 16m 36s
-02° 30’ 01”

The simplified sky map below shows the position of 39 Ceti in the sky:

Finder chart 39 Ceti star
Simplified finder chart for 39 Ceti.

Visibility of 39 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 39 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: 92.5°
Max altitude: 36.0°
Azimuth: 267.5°

Distance of 39 Ceti from the Sun and relative movement

39 Ceti is distant 255.89 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

78.49 pc
255.89 ly
-20 km/s
-0.104 arcsec/year
-0.063 arcsec/year

Spectral properties of 39 Ceti

39 Ceti belongs to spectral class G5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 39 Ceti is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 39 Ceti. Attribution: Richard Powell / CC BY-SA

39 Ceti star system properties

39 Ceti is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 39 Ceti double sysyem:

177.6 arcsec

Alternative designations of 39 Ceti