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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: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
wb_twilight Civil TwilightWhat's Visible Now?
All Constellations » Eridanus » 

45 Eridani

Altitude: -11.8°   Azimuth: 285.2°   Direction: West-North-West

45 Eridani is a bright giant star in the constellation of Eridanus.

45 Eridani visual magnitude is 4.91. Because of its moderate brightness, 45 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 45 Eridani:

Bright giant

45 Eridani is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -11.8°
Azimuth: 285.2°
Direction: West-North-West

Celestial coordinates and finder chart of 45 Eridani

45 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 45 Eridani are provided in the following table:

04h 31m 52s
-00° 02’ 38”

The simplified sky map below shows the position of 45 Eridani in the sky:

Finder chart 45 Eridani star
Simplified finder chart for 45 Eridani.

Visibility of 45 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 45 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: 90.0°
Max altitude: 38.5°
Azimuth: 270.0°

Digitized Sky Survey image of 45 Eridani

The image below is a photograph of 45 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 45 Eridani is 0.003 arcsec per year in Right Ascension and -0.009 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of 45 Eridani star
DSS2 image of 45 Eridani. The red arrow shows the motion of 45 Eridani during the next 100000 years (5.00 arcmin in Right Ascension and -15.00 arcmin in declination);

Distance of 45 Eridani from the Sun and relative movement

45 Eridani is distant 829.52 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

254.45 pc
829.52 ly
17 km/s
0.003 arcsec/year
-0.009 arcsec/year

Spectral properties of 45 Eridani

45 Eridani belongs to spectral class K3 and has a luminosity class of II corresponding to a bright giant star.


The red dot in the diagram below shows where 45 Eridani is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 45 Eridani. Attribution: Richard Powell / CC BY-SA

Alternative designations of 45 Eridani