Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:51  
clear_day Transit: 12:56  
SunsetSet: 21:00 south
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All Constellations » Cetus » 

81 Ceti

81 Ceti is a giant star in the constellation of Cetus.

81 Ceti visual magnitude is 5.65. Because of its reltive faintness, 81 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 81 Ceti:

81 Ceti is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 33°.

Celestial coordinates and finder chart of 81 Ceti

81 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 81 Ceti are provided in the following table:

02h 37m 41s
-03° 23’ 45”

The simplified sky map below shows the position of 81 Ceti in the sky:

Finder chart 81 Ceti star
Simplified finder chart for 81 Ceti.

Visibility of 81 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 81 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: 93.4°
Max altitude: 35.1°
Azimuth: 266.6°
81 Ceti is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 81 Ceti

The image below is a photograph of 81 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 81 Ceti is 0.041 arcsec per year in Right Ascension and -0.045 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 81 Ceti star
DSS2 image of 81 Ceti. The red arrow shows the motion of 81 Ceti during the next 10000 years (6.83 arcmin in Right Ascension and -7.50 arcmin in declination);

Distance of 81 Ceti from the Sun and relative movement

81 Ceti is distant 316.81 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

97.18 pc
316.81 ly
8 km/s
0.041 arcsec/year
-0.045 arcsec/year

Spectral properties of 81 Ceti

81 Ceti belongs to spectral class G5


The red dot in the diagram below shows where 81 Ceti is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 81 Ceti. Attribution: Richard Powell / CC BY-SA

Alternative designations of 81 Ceti