21 Eridani

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

21 Eridani visual magnitude is 5.96. Because of its reltive faintness, 21 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 21 Eridani:

Color of 21 Eridani ⬤

Magnitude of 21 Eridani 5.96

Class Main-sequence

VISIBILITY RIGHT NOW 21 Eridani is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of 21 Eridani

21 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 21 Eridani are provided in the following table:

Right Ascension J2000 03h 39m 01s

Declination J2000 -05° 37’ 33”

Galactic Longitude 192.27°

Galactic Latitude -44.75°

Constellation Eridanus

The simplified sky map below shows the position of 21 Eridani in the sky:

Simplified finder chart for 21 Eridani.

Visibility of 21 Eridani from your location

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

Today's 21 Eridani rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 95.6° RISE 10:42

Max altitude: 32.9° TRANSIT 16:11

Azimuth: 264.4° SET 21:41

RIGHT NOW 21 Eridani is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 21 Eridani

The image below is a photograph of 21 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 21 Eridani is -0.015 arcsec per year in Right Ascension and -0.205 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of 21 Eridani. The red arrow shows the motion of 21 Eridani during the next 1000 years (-0.25 arcmin in Right Ascension and -3.42 arcmin in declination);

Distance of 21 Eridani from the Sun and relative movement

21 Eridani is distant 114.63 light years from the Sun and it is moving far from the Sun at the speed of 40 kilometers per second.

Distance (parsec) 35.16 pc

Distance (light year) 114.63 ly

Heliocentric radial velocity 40 km/s

Proper Motion RA -0.015 arcsec/year

Proper Motion Dec -0.205 arcsec/year

Spectral properties of 21 Eridani

21 Eridani belongs to spectral class K1 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 3.23

Spectral Type K1V

Color Index (B-V) 0.92

Temperature of 21 Eridani 4943K

The red dot in the diagram below shows where 21 Eridani is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 21 Eridani. Attribution: Richard Powell / CC BY-SA

Alternative designations of 21 Eridani

Flamsteed designation 21 Eridani

Henry Draper Catalogue HD22713

SAO Catalogue SAO130634

Hipparcos Catalogue HIP17027

Durchmusterung Catalogue BD-06 713

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Other stars in Eridanus