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: 4:45  
clear_day Transit: 12:57  
SunsetSet: 21:09 south
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All Constellations » Eridanus » 

υ1 Eridani (upsilon1 Eridani)

Altitude: -67.5°   Azimuth: 17.8°   Direction: North-North-East

υ1 Eridani is a variable hypergiant star in the constellation of Eridanus.

υ1 Eridani visual magnitude is 4.51. Because of its moderate brightness, υ1 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 υ1 Eridani:


υ1 Eridani (upsilon1 Eridani) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -67.5°
Azimuth: 17.8°
Direction: North-North-East

Celestial coordinates and finder chart of υ1 Eridani

υ1 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 υ1 Eridani are provided in the following table:

04h 33m 30s
-29° 46’ 00”

The simplified sky map below shows the position of υ1 Eridani in the sky:

Finder chart υ1 Eridani (upsilon1 Eridani) star
Simplified finder chart for υ1 Eridani (upsilon1 Eridani).

Visibility of υ1 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 υ1 Eridani (upsilon1 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: 119.8°
Max altitude: 8.8°
Azimuth: 240.2°
υ1 Eridani (upsilon1 Eridani) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of υ1 Eridani

The image below is a photograph of υ1 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 υ1 Eridani is -0.102 arcsec per year in Right Ascension and -0.275 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of υ1 Eridani (upsilon1 Eridani) star
DSS2 image of υ1 Eridani. The red arrow shows the motion of υ1 Eridani during the next 1000 years (-1.70 arcmin in Right Ascension and -4.58 arcmin in declination);

Distance of υ1 Eridani from the Sun and relative movement

υ1 Eridani is distant 124.33 light years from the Sun and it is moving far from the Sun at the speed of 21 kilometers per second.

38.14 pc
124.33 ly
21 km/s
-0.102 arcsec/year
-0.275 arcsec/year

Spectral properties of υ1 Eridani

υ1 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 υ1 Eridani is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of υ1 Eridani. Attribution: Richard Powell / CC BY-SA

Alternative designations of υ1 Eridani

υ1 Eridani
(upsilon1 Eridani)