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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
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All Constellations » Eridanus » 

ρ1 Eridani (rho1 Eridani)

Altitude: -24.5°   Azimuth: 289.7°   Direction: West-North-West

ρ1 Eridani is a hypergiant star in the constellation of Eridanus.

ρ1 Eridani visual magnitude is 5.75. Because of its reltive faintness, ρ1 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 ρ1 Eridani:


ρ1 Eridani (rho1 Eridani) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -24.5°
Azimuth: 289.7°
Direction: West-North-West

Celestial coordinates and finder chart of ρ1 Eridani

ρ1 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 ρ1 Eridani are provided in the following table:

03h 01m 09s
-07° 39’ 46”

The simplified sky map below shows the position of ρ1 Eridani in the sky:

Finder chart ρ1 Eridani (rho1 Eridani) star
Simplified finder chart for ρ1 Eridani (rho1 Eridani).

Visibility of ρ1 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 ρ1 Eridani (rho1 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: 97.7°
Max altitude: 30.9°
Azimuth: 262.3°

Digitized Sky Survey image of ρ1 Eridani

The image below is a photograph of ρ1 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 ρ1 Eridani is 0.098 arcsec per year in Right Ascension and -0.07 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of ρ1 Eridani (rho1 Eridani) star
DSS2 image of ρ1 Eridani. The red arrow shows the motion of ρ1 Eridani during the next 1000 years (1.63 arcmin in Right Ascension and -1.17 arcmin in declination);

Distance of ρ1 Eridani from the Sun and relative movement

ρ1 Eridani is distant 304.39 light years from the Sun and it is moving far from the Sun at the speed of 14 kilometers per second.

93.37 pc
304.39 ly
14 km/s
0.098 arcsec/year
-0.07 arcsec/year

Spectral properties of ρ1 Eridani

ρ1 Eridani belongs to spectral class K0 and has a luminosity class of II corresponding to a hypergiant star.


The red dot in the diagram below shows where ρ1 Eridani is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ρ1 Eridani. Attribution: Richard Powell / CC BY-SA

Alternative designations of ρ1 Eridani

ρ1 Eridani
(rho1 Eridani)