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public LocationGreenwich, UK
Sunrise: 5:08 
Transit: 13:06 
Sunset: 21:03
wb_twilight   (Astronomical Twilight)   What's Visible Now?
All Constellations » Eridanus » 

τ9 Eridani (tau9 Eridani)

Below the horizon.  Rise: 5:23 | Tran: 9:06 | Set: 12:49
Alt: -31.81°   Az: 89.30°   Direction: East

τ9 Eridani is a variable main-sequence star of spectral class B6 in the constellation of Eridanus.

τ9 Eridani visual magnitude is 4.66. Because of its moderate brightness, τ9 Eridani is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Image of τ9 Eridani (tau9 Eridani) star
DSS2 image of τ9 Eridani. The red arrow shows the motion of τ9 Eridani during the next 10000 years (2.50 arcmin in Right Ascension and 2.50 arcmin in declination);

Celestial Coordinates


04h 00m 58s
-23° 56’ 53”
16h 33m 35s
20h 34m 33s


03h 59m 55s
-24° 00’ 59”

Galactic Coordinates


Finder Chart

Finder chart τ9 Eridani (tau9 Eridani) star
Simplified finder chart for τ9 Eridani (tau9 Eridani).

Magnitude, Color, Spectral Class



The red dot in the diagram below shows where τ9 Eridani is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of τ9 Eridani. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

τ9 Eridani is distant 330.96 light years from the Sun and it is moving far from the Sun at the speed of 24 kilometers per second.

24 km/s
0.015 arcsec/y

Alternative Designations

τ9 Eridani
(tau9 Eridani)

Visibility from Your Location

Today's τ9 Eridani (tau9 Eridani) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 113.9°
Max altitude: 14.6°
Azimuth: 246.1°