21 Eridani

Below the horizon. Rise: 21:33 | Tran: 3:07 | Set: 8:37

Alt: -42.98° Az: 16.57° Direction: North-North-East

21 Eridani is a main-sequence star of spectral class K1 in the constellation of Eridanus.

21 Eridani visual magnitude is 5.96. Because of its faintness, 21 Eridani is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

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);

Celestial Coordinates

Apparent

Right Ascension 03h 40m 14s

Declination -05° 32’ 48”

Hour Angle 12h 48m 24s

Sidereal Time 16h 28m 38s

J2000

Right Ascension 03h 39m 01s

Declination -05° 37’ 33”

Galactic Coordinates

Galactic Longitude 192.27°

Galactic Latitude -44.75°

Finder Chart

Simplified finder chart for 21 Eridani.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.96

Class Main-sequence

Absolute magnitude 3.23

Spectral Type K1V

Color Index (B-V) 0.92

Temperature 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

Distance, Radial Speed, Proper Motion

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

Distance (light year) 114.63

Radial Speed 40 km/s

Proper Motion RA -0.015 arcsec/y

Proper Motion Dec -0.205"/y

Alternative Designations

Flamsteed designation 21 Eridani

Henry Draper Catalogue HD22713

SAO Catalogue SAO130634

Hipparcos Catalogue HIP17027

Durchmusterung Catalogue BD-06 713

Visibility from Your Location

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

Azimuth: 95.5° RISE 21:33

Max altitude: 33.0° TRANSIT 3:07

Azimuth: 264.5° SET 8:37

Set Location

Other stars in Eridanus