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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: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sunny DaytimeWhat's Visible Now?
All Constellations » Eridanus » 

15 Eridani

Altitude: -29.2°   Azimuth: 90.1°   Direction: East

15 Eridani is a double giant star in the constellation of Eridanus.

15 Eridani visual magnitude is 4.88. Because of its moderate brightness, 15 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 15 Eridani:


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

Altitude: -29.2°
Azimuth: 90.1°
Direction: East

Celestial coordinates and finder chart of 15 Eridani

15 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 15 Eridani are provided in the following table:

03h 18m 22s
-22° 30’ 41”

The simplified sky map below shows the position of 15 Eridani in the sky:

Finder chart 15 Eridani star
Simplified finder chart for 15 Eridani.

Visibility of 15 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 15 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: 112.5°
Max altitude: 16.0°
Azimuth: 247.5°

Digitized Sky Survey image of 15 Eridani

The image below is a photograph of 15 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 15 Eridani is 0.018 arcsec per year in Right Ascension and 0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 15 Eridani star
DSS2 image of 15 Eridani. The red arrow shows the motion of 15 Eridani during the next 10000 years (3.00 arcmin in Right Ascension and 2.00 arcmin in declination);

Distance of 15 Eridani from the Sun and relative movement

15 Eridani is distant 254.89 light years from the Sun and it is moving far from the Sun at the speed of 24 kilometers per second.

78.19 pc
254.89 ly
24 km/s
0.018 arcsec/year
0.012 arcsec/year

Spectral properties of 15 Eridani

15 Eridani belongs to spectral class G6 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 15 Eridani is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 15 Eridani. Attribution: Richard Powell / CC BY-SA

15 Eridani star system properties

15 Eridani 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 15 Eridani double sysyem:

0.2 arcsec

Alternative designations of 15 Eridani