υ4 Eridani (upsilon4 Eridani)

υ4 Eridani is a variable and multiple main-sequence star in the constellation of Eridanus.

υ4 Eridani visual magnitude is 3.56. Because of its moderate brightness, υ4 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 υ4 Eridani:

Color of υ4 Eridani ⬤

Magnitude of υ4 Eridani 3.56

Class Main-sequence

VISIBILITY RIGHT NOW υ4 Eridani (upsilon4 Eridani) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of υ4 Eridani

υ4 Eridani is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of υ4 Eridani are provided in the following table:

Right Ascension J2000 04h 17m 53s

Declination J2000 -33° 47’ 53”

Galactic Longitude 234.67°

Galactic Latitude -45.47°

Constellation Eridanus

The simplified sky map below shows the position of υ4 Eridani in the sky:

Finder chart υ4 Eridani (upsilon4 Eridani) star

Simplified finder chart for υ4 Eridani (upsilon4 Eridani).

Visibility of υ4 Eridani from your location

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

Today's υ4 Eridani (upsilon4 Eridani) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 123.8° RISE 10:32

Max altitude: 4.7° TRANSIT 12:43

Azimuth: 236.2° SET 14:53

RIGHT NOW υ4 Eridani (upsilon4 Eridani) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of υ4 Eridani

The image below is a photograph of υ4 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 υ4 Eridani is 0.067 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.

Image of υ4 Eridani (upsilon4 Eridani) star

DSS2 image of υ4 Eridani. The red arrow shows the motion of υ4 Eridani during the next 10000 years (11.17 arcmin in Right Ascension and -1.33 arcmin in declination);

Distance of υ4 Eridani from the Sun and relative movement

υ4 Eridani is distant 178.43 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

Distance (parsec) 54.73 pc

Distance (light year) 178.43 ly

Heliocentric radial velocity 18 km/s

Proper Motion RA 0.067 arcsec/year

Proper Motion Dec -0.008 arcsec/year

Spectral properties of υ4 Eridani

υ4 Eridani belongs to spectral class B9 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -0.13

Spectral Type B9V

Color Index (B-V) -0.12

Temperature of υ4 Eridani 11920K

The red dot in the diagram below shows where υ4 Eridani is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of υ4 Eridani. Attribution: Richard Powell / CC BY-SA

υ4 Eridani star system properties

υ4 Eridani is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the υ4 Eridani double sysyem:

Main star magnitude 3.56

Secondary star magnitude 4.56

Magnitude difference 1

Separation 0.2 arcsec

Alternative designations of υ4 Eridani

Bayer designation υ4 Eridani
(upsilon4 Eridani)

Flamsteed designation 41 Eridani

Henry Draper Catalogue HD27376

SAO Catalogue SAO194902

Hipparcos Catalogue HIP20042

Durchmusterung Catalogue CD-34 1614

General Catalogue of Variable Stars Var

In Evidence

Other stars in Eridanus