66 Eridani

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:

Color of 66 Eridani ⬤

Magnitude of 66 Eridani 5.12

Class Main-sequence

VISIBILITY RIGHT NOW 66 Eridani is below the horizon from Greenwich, United Kingdom [change].

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:

Right Ascension J2000 05h 06m 45s

Declination J2000 -04° 39’ 18”

Galactic Longitude 204.78°

Galactic Latitude -25.35°

Constellation Eridanus

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

Simplified finder chart for 66 Eridani.

Visibility of 66 Eridani from your location

Location: Greenwich, United Kingdom [change]
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 [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 94.7° RISE 11:32

Max altitude: 33.9° TRANSIT 17:06

Azimuth: 265.3° SET 22:41

RIGHT NOW 66 Eridani is below the horizon from Greenwich, United Kingdom

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.

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.

Distance (parsec) 85.84 pc

Distance (light year) 279.83 ly

Heliocentric radial velocity 31 km/s

Proper Motion RA 0.016 arcsec/year

Proper Motion Dec 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.

Absolute magnitude 0.45

Spectral Type B9V

Color Index (B-V) -0.06

Temperature of 66 Eridani 10941K

The red dot in the diagram below shows where 66 Eridani is situated in the Hertzsprung–Russell 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:

Main star magnitude 5.12

Secondary star magnitude 10.52

Magnitude difference 5.4

Separation 52.8 arcsec

Alternative designations of 66 Eridani

Flamsteed designation 66 Eridani

Henry Draper Catalogue HD32964

SAO Catalogue SAO131777

Hipparcos Catalogue HIP23794

Durchmusterung Catalogue BD-04 1044

General Catalogue of Variable Stars 1831

Aitken Double Star Catalogue ADS3698

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Other stars in Eridanus