τ4 Eridani (tau4 Eridani)
τ4 Eridani is a variable and multiple giant star in the constellation of Eridanus.
τ4 Eridani visual magnitude is 3.69. Because of its moderate brightness, τ4 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 τ4 Eridani:
Celestial coordinates and finder chart of τ4 Eridani
τ4 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 τ4 Eridani are provided in the following table:
The simplified sky map below shows the position of τ4 Eridani in the sky:
Visibility of τ4 Eridani from your location
Digitized Sky Survey image of τ4 Eridani
The image below is a photograph of τ4 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 τ4 Eridani is 0.052 arcsec per year in Right Ascension and 0.033 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of τ4 Eridani from the Sun and relative movement
τ4 Eridani is distant 258.12 light years from the Sun and it is moving far from the Sun at the speed of 42 kilometers per second.
Spectral properties of τ4 Eridani
τ4 Eridani belongs to spectral class M3 and has a luminosity class of III corresponding to a giant star.
The red dot in the diagram below shows where τ4 Eridani is situated in the Hertzsprung–Russell diagram.
τ4 Eridani star system properties
τ4 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 τ4 Eridani double sysyem: