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: 4:46  
clear_day Transit: 12:57  
SunsetSet: 21:08 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Eridanus » 

47 Eridani

Altitude: -46.7°   Azimuth: 359.2°   Direction: North

47 Eridani is a variable giant star in the constellation of Eridanus.

47 Eridani visual magnitude is 5.11. Because of its reltive faintness, 47 Eridani 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 47 Eridani:


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

Altitude: -46.7°
Azimuth: 359.2°
Direction: North

Celestial coordinates and finder chart of 47 Eridani

47 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 47 Eridani are provided in the following table:

04h 34m 11s
-08° 13’ 53”

The simplified sky map below shows the position of 47 Eridani in the sky:

Finder chart 47 Eridani star
Simplified finder chart for 47 Eridani.

Visibility of 47 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 47 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: 98.2°
Max altitude: 30.3°
Azimuth: 261.8°
47 Eridani is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 47 Eridani

The image below is a photograph of 47 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 47 Eridani is -0.018 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 47 Eridani star
DSS2 image of 47 Eridani. The red arrow shows the motion of 47 Eridani during the next 10000 years (-3.00 arcmin in Right Ascension and -0.17 arcmin in declination);

Distance of 47 Eridani from the Sun and relative movement

47 Eridani is distant 804.94 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

246.91 pc
804.94 ly
-12 km/s
-0.018 arcsec/year
-0.001 arcsec/year

Spectral properties of 47 Eridani

47 Eridani belongs to spectral class M3 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 47 Eridani is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 47 Eridani. Attribution: Richard Powell / CC BY-SA

Alternative designations of 47 Eridani