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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: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sleep NighttimeWhat's Visible Now?
All Constellations » Cetus » 

25 Ceti

Altitude: 30.6°   Azimuth: 206.0°   Direction: South-South-West

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

25 Ceti visual magnitude is 5.43. Because of its reltive faintness, 25 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 25 Ceti:


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

Altitude: 30.6°
Azimuth: 206.0°
Direction: South-South-West

Celestial coordinates and finder chart of 25 Ceti

25 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 25 Ceti are provided in the following table:

01h 03m 02s
-04° 50’ 12”

The simplified sky map below shows the position of 25 Ceti in the sky:

Finder chart 25 Ceti star
Simplified finder chart for 25 Ceti.

Visibility of 25 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 25 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: 94.8°
Max altitude: 33.7°
Azimuth: 265.2°

Digitized Sky Survey image of 25 Ceti

The image below is a photograph of 25 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 25 Ceti is -0.108 arcsec per year in Right Ascension and -0.106 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 25 Ceti star
DSS2 image of 25 Ceti. The red arrow shows the motion of 25 Ceti during the next 1000 years (-1.80 arcmin in Right Ascension and -1.77 arcmin in declination);

Distance of 25 Ceti from the Sun and relative movement

25 Ceti is distant 410.06 light years from the Sun and it is moving far from the Sun at the speed of 15 kilometers per second.

125.79 pc
410.06 ly
15 km/s
-0.108 arcsec/year
-0.106 arcsec/year

Spectral properties of 25 Ceti

25 Ceti belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 25 Ceti is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 25 Ceti. Attribution: Richard Powell / CC BY-SA

25 Ceti star system properties

25 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 25 Ceti double sysyem:

99.9 arcsec

Alternative designations of 25 Ceti