39 Eridani

39 Eridani is a multiple giant star in the constellation of Eridanus.

39 Eridani visual magnitude is 4.87. Because of its moderate brightness, 39 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 39 Eridani:

Color of 39 Eridani ⬤

Magnitude of 39 Eridani 4.87

Class Giant

VISIBILITY RIGHT NOW 39 Eridani is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of 39 Eridani

39 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 39 Eridani are provided in the following table:

Right Ascension J2000 04h 14m 23s

Declination J2000 -10° 15’ 23”

Galactic Longitude 203.58°

Galactic Latitude -39.45°

Constellation Eridanus

The simplified sky map below shows the position of 39 Eridani in the sky:

Simplified finder chart for 39 Eridani.

Visibility of 39 Eridani from your location

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

Today's 39 Eridani rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 100.3° RISE 11:08

Max altitude: 28.3° TRANSIT 16:14

Azimuth: 259.7° SET 21:20

RIGHT NOW 39 Eridani is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 39 Eridani

The image below is a photograph of 39 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 39 Eridani is -0.009 arcsec per year in Right Ascension and -0.162 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of 39 Eridani. The red arrow shows the motion of 39 Eridani during the next 1000 years (-0.15 arcmin in Right Ascension and -2.70 arcmin in declination);

Distance of 39 Eridani from the Sun and relative movement

39 Eridani is distant 206.33 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

Distance (parsec) 63.29 pc

Distance (light year) 206.33 ly

Heliocentric radial velocity 7 km/s

Proper Motion RA -0.009 arcsec/year

Proper Motion Dec -0.162 arcsec/year

Spectral properties of 39 Eridani

39 Eridani belongs to spectral class K3 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 0.86

Spectral Type K3III

Color Index (B-V) 1.17

Temperature of 39 Eridani 4368K

The red dot in the diagram below shows where 39 Eridani is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 39 Eridani. Attribution: Richard Powell / CC BY-SA

39 Eridani star system properties

39 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 39 Eridani double sysyem:

Main star magnitude 4.87

Secondary star magnitude 8.57

Magnitude difference 3.7

Separation 6.4 arcsec

Alternative designations of 39 Eridani

Flamsteed designation 39 Eridani

Henry Draper Catalogue HD26846

SAO Catalogue SAO149478

Hipparcos Catalogue HIP19777

Durchmusterung Catalogue BD-10 867

Aitken Double Star Catalogue ADS3079

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Other stars in Eridanus