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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
SunriseRise: 5:43  
clear_day Transit: 12:56  
SunsetSet: 20:10
sunny DaytimeWhat's Visible Now?
All Constellations » Eridanus » 

υ4 Eridani (upsilon4 Eridani)

Altitude: 4.7°   Azimuth: 180.2°   Direction: South

υ4 Eridani is a variable and multiple main-sequence star in the constellation of Eridanus.

υ4 Eridani visual magnitude is 3.56. Because of its moderate brightness, υ4 Eridani should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of υ4 Eridani is 0.067 arcsec per year in Right Ascension and -0.008 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of υ4 Eridani (upsilon4 Eridani) star
DSS2 image of υ4 Eridani. The red arrow shows the motion of υ4 Eridani during the next 10000 years (11.17 arcmin in Right Ascension and -1.33 arcmin in declination);

Key facts about υ4 Eridani


υ4 Eridani (upsilon4 Eridani) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 4.7°
Azimuth: 180.2°
Direction: South

Celestial coordinates and finder chart of υ4 Eridani

υ4 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 υ4 Eridani are provided in the following table:

04h 17m 53s
-33° 47’ 53”

The simplified sky map below shows the position of υ4 Eridani in the sky:

Finder chart υ4 Eridani (upsilon4 Eridani) star
Simplified finder chart for υ4 Eridani (upsilon4 Eridani).

Visibility of υ4 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 υ4 Eridani (upsilon4 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: 123.8°
Max altitude: 4.7°
Azimuth: 236.2°

Distance of υ4 Eridani from the Sun and relative movement

υ4 Eridani is distant 178.43 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

54.73 pc
178.43 ly
18 km/s
0.067 arcsec/year
-0.008 arcsec/year

Spectral properties of υ4 Eridani

υ4 Eridani belongs to spectral class B9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where υ4 Eridani is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of υ4 Eridani. Attribution: Richard Powell / CC BY-SA

υ4 Eridani star system properties

υ4 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 υ4 Eridani double sysyem:

0.2 arcsec

Alternative designations of υ4 Eridani

υ4 Eridani
(upsilon4 Eridani)