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
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All Constellations » Eridanus » 

φ Eridani (phi Eridani)

Altitude: -47.5°   Azimuth: 240.7°   Direction: West-South-West

φ Eridani is a double main-sequence star in the constellation of Eridanus.

φ Eridani visual magnitude is 3.56. Because of its moderate brightness, φ 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 φ Eridani:


φ Eridani (phi Eridani) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -47.5°
Azimuth: 240.7°
Direction: West-South-West

Celestial coordinates and finder chart of φ Eridani

φ 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 φ Eridani are provided in the following table:

02h 16m 30s
-51° 30’ 43”

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

Finder chart φ Eridani (phi Eridani) star
Simplified finder chart for φ Eridani (phi Eridani).

Visibility of φ Eridani from your location

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

φ Eridani (phi Eridani) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of φ Eridani

The image below is a photograph of φ 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 φ Eridani is 0.096 arcsec per year in Right Ascension and -0.027 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of φ Eridani (phi Eridani) star
DSS2 image of φ Eridani. The red arrow shows the motion of φ Eridani during the next 1000 years (1.60 arcmin in Right Ascension and -0.45 arcmin in declination);

Distance of φ Eridani from the Sun and relative movement

φ Eridani is distant 154.80 light years from the Sun and it is moving far from the Sun at the speed of 10 kilometers per second.

47.48 pc
154.80 ly
10 km/s
0.096 arcsec/year
-0.027 arcsec/year

Spectral properties of φ Eridani

φ Eridani belongs to spectral class B8 and has a luminosity class of V corresponding to a main-sequence star.


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

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

φ Eridani star system properties

φ Eridani is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the φ Eridani double sysyem:

87.6 arcsec

Alternative designations of φ Eridani

φ Eridani
(phi Eridani)