51 Eridani

Above the horizon. Rise: 0:10 | Tran: 6:00 | Set: 11:46

Alt: 30.32° Az: 144.42° Direction: South-East

51 Eridani is a multiple hypergiant star of spectral class F0 in the constellation of Eridanus.

51 Eridani visual magnitude is 5.23. Because of its faintness, 51 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 51 Eridani. The red arrow shows the motion of 51 Eridani during the next 10000 years (7.00 arcmin in Right Ascension and -10.17 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 04h 38m 50s

Declination -02° 25’ 31”

Hour Angle 21h 59m 17s

Sideral Time 02h 38m 08s

J2000

Right Ascension 04h 37m 36s

Declination -02° 28’ 23”

Galactic Coordinates

Galactic Longitude 198.61°

Galactic Latitude -30.66°

Finder Chart

Simplified finder chart for 51 Eridani.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.23

Class Hypergiant

Absolute magnitude 2.86

Spectral Type F0V

Color Index (B-V) 0.28

Temperature 7591K

The red dot in the diagram below shows where 51 Eridani is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 51 Eridani. Attribution: Richard Powell / CC BY-SA

Star System Properties

51 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 51 Eridani double sysyem:

Main star magnitude 5.23

Secondary star magnitude 11.13

Magnitude difference 5.9

Separation 80 arcsec

Distance, Radial Speed, Proper Motion

51 Eridani is distant 97.02 light years from the Sun and it is moving far from the Sun at the speed of 21 kilometers per second.

Distance (parsec) 29.76

Distance (light year) 97.02

Radial Speed 21 km/s

Proper Motion RA 0.042 arcsec/y

Proper Motion Dec -0.061"/y

Alternative Designations

Flamsteed designation 51 Eridani

Henry Draper Catalogue HD29391

SAO Catalogue SAO131358

Hipparcos Catalogue HIP21547

Durchmusterung Catalogue BD-02 963

Aitken Double Star Catalogue ADS3350

Visibility from Your Location

Today's 51 Eridani rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 92.4° RISE 0:10

Max altitude: 36.1° TRANSIT 6:00

Azimuth: 267.6° SET 11:46

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Eridanus