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public LocationGreenwich, UK
Sunrise: 4:43 
Transit: 13:01 
Sunset: 21:18
wb_twilight   (Astronomical Twilight)   What's Visible Now?
All Constellations » Gemini » 

τ Geminorum (tau Geminorum)

Below the horizon.  Rise: 4:53 | Tran: 13:58 | Set: 23:03
Altitude: -1.7°   Azimuth: 327.9°   Direction: North-North-West

τ Geminorum is a variable and multiple giant star of spectral class K2 in the constellation of Gemini.

τ Geminorum visual magnitude is 4.41. Because of its moderate brightness, τ Geminorum 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.

Celestial coordinates and finder chart of τ Geminorum

Finder chart τ Geminorum (tau Geminorum) star
Simplified finder chart for τ Geminorum (tau Geminorum).

τ Geminorum is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of τ Geminorum are provided in the following table:

07h 11m 08s
+30° 14’ 43”
Image of τ Geminorum (tau Geminorum) star
DSS2 image of τ Geminorum. The red arrow shows the motion of τ Geminorum during the next 10000 years (-5.00 arcmin in Right Ascension and -7.50 arcmin in declination);

Key facts about τ Geminorum


and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where τ Geminorum is situated in the Hertzsprung–Russell diagram.

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

τ Geminorum star system properties

τ Geminorum 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 τ Geminorum double sysyem:

1.9 arcsec

Distance of τ Geminorum from the Sun and relative movement

τ Geminorum is distant 301.57 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

92.51 pc
301.57 ly
22 km/s
-0.03 arcsec/year
-0.045 arcsec/year

Alternative designations of τ Geminorum

τ Geminorum
(tau Geminorum)
46 Geminorum

Visibility of τ Geminorum from your location

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

Azimuth: 59.8°
Max altitude: 68.8°
Azimuth: 300.2°