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 » Eridanus » 

ι Eridani (iota Eridani)

ι Eridani is a hypergiant star in the constellation of Eridanus.

ι Eridani visual magnitude is 4.11. Because of its moderate brightness, ι 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 ι Eridani:

ι Eridani (iota Eridani) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of ι Eridani

ι Eridani is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of ι Eridani are provided in the following table:

02h 40m 40s
-39° 51’ 20”

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

Finder chart ι Eridani (iota Eridani) star
Simplified finder chart for ι Eridani (iota Eridani).

Visibility of ι Eridani from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

ι Eridani (iota Eridani) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of ι Eridani

The image below is a photograph of ι 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 ι Eridani is 0.138 arcsec per year in Right Ascension and -0.032 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of ι Eridani (iota Eridani) star
DSS2 image of ι Eridani. The red arrow shows the motion of ι Eridani during the next 1000 years (2.30 arcmin in Right Ascension and -0.53 arcmin in declination);

Distance of ι Eridani from the Sun and relative movement

ι Eridani is distant 145.41 light years from the Sun and it is moving towards the Sun at the speed of 9 kilometers per second.

44.60 pc
145.41 ly
-9 km/s
0.138 arcsec/year
-0.032 arcsec/year

Spectral properties of ι Eridani

ι Eridani 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 ι Eridani is situated in the Hertzsprung–Russell diagram.

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

Alternative designations of ι Eridani

ι Eridani
(iota Eridani)