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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: 7:48  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
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All Constellations » Eridanus » 

39 Eridani

Altitude: -21.3°   Azimuth: 280.6°   Direction: West

39 Eridani is a multiple giant star in the constellation of Eridanus.

39 Eridani visual magnitude is 4.87. Because of its moderate brightness, 39 Eridani should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about 39 Eridani:


39 Eridani is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -21.3°
Azimuth: 280.6°
Direction: West

Celestial coordinates and finder chart of 39 Eridani

39 Eridani 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 Eridani are provided in the following table:

04h 14m 23s
-10° 15’ 23”

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

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

Visibility of 39 Eridani 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 Eridani 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: 100.3°
Max altitude: 28.3°
Azimuth: 259.7°

Digitized Sky Survey image of 39 Eridani

The image below is a photograph of 39 Eridani 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 39 Eridani is -0.009 arcsec per year in Right Ascension and -0.162 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 39 Eridani star
DSS2 image of 39 Eridani. The red arrow shows the motion of 39 Eridani during the next 1000 years (-0.15 arcmin in Right Ascension and -2.70 arcmin in declination);

Distance of 39 Eridani from the Sun and relative movement

39 Eridani is distant 206.33 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

63.29 pc
206.33 ly
7 km/s
-0.009 arcsec/year
-0.162 arcsec/year

Spectral properties of 39 Eridani

39 Eridani belongs to spectral class K3 and has a luminosity class of III corresponding to a giant star.


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

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

39 Eridani star system properties

39 Eridani 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 Eridani double sysyem:

6.4 arcsec

Alternative designations of 39 Eridani