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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:44  
clear_day Transit: 12:51  
SunsetSet: 18:57 south
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All Constellations » Eridanus » 

66 Eridani

Altitude: -13.9°   Azimuth: 79.9°   Direction: East

66 Eridani is a variable and double main-sequence star in the constellation of Eridanus.

66 Eridani visual magnitude is 5.12. Because of its reltive faintness, 66 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 66 Eridani:


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

Altitude: -13.9°
Azimuth: 79.9°
Direction: East

Celestial coordinates and finder chart of 66 Eridani

66 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 66 Eridani are provided in the following table:

05h 06m 45s
-04° 39’ 18”

The simplified sky map below shows the position of 66 Eridani in the sky:

Finder chart 66 Eridani star
Simplified finder chart for 66 Eridani.

Visibility of 66 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 66 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: 94.7°
Max altitude: 33.9°
Azimuth: 265.3°

Digitized Sky Survey image of 66 Eridani

The image below is a photograph of 66 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 66 Eridani is 0.016 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 66 Eridani star
DSS2 image of 66 Eridani. The red arrow shows the motion of 66 Eridani during the next 10000 years (2.67 arcmin in Right Ascension and 1.33 arcmin in declination);

Distance of 66 Eridani from the Sun and relative movement

66 Eridani is distant 279.83 light years from the Sun and it is moving far from the Sun at the speed of 31 kilometers per second.

85.84 pc
279.83 ly
31 km/s
0.016 arcsec/year
0.008 arcsec/year

Spectral properties of 66 Eridani

66 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 66 Eridani is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 66 Eridani. Attribution: Richard Powell / CC BY-SA

66 Eridani star system properties

66 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 66 Eridani double sysyem:

52.8 arcsec

Alternative designations of 66 Eridani