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public LocationGreenwich, UK
Sunrise: 5:14 
Transit: 13:06 
Sunset: 20:58
wb_twilight   (Nautical Twilight)   What's Visible Now?
All Constellations » Sagittarius » 

τ Sagittarii (tau Sagittarii)

Below the horizon.  Rise: 20:41 | Tran: 23:55 | Set: 3:14
Alt: -5.61°   Az: 231.33°   Direction: South-West

τ Sagittarii is a giant star of spectral class K1 in the constellation of Sagittarius.

τ Sagittarii visual magnitude is 3.32. Because of its moderate brightness, τ Sagittarii 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 τ Sagittarii (tau Sagittarii) star
DSS2 image of τ Sagittarii. The red arrow shows the motion of τ Sagittarii during the next 1000 years (-0.88 arcmin in Right Ascension and -4.18 arcmin in declination);

Celestial Coordinates


19h 08m 28s
-27° 37’ 50”
04h 05m 09s
23h 13m 37s


19h 06m 56s
-27° 40’ 14”

Galactic Coordinates


Finder Chart

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

Magnitude, Color, Spectral Class



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

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

Distance, Radial Speed, Proper Motion

τ Sagittarii is distant 120.34 light years from the Sun and it is moving far from the Sun at the speed of 45 kilometers per second.

45 km/s
-0.053 arcsec/y

Alternative Designations

τ Sagittarii
(tau Sagittarii)
40 Sagittarii

Visibility from Your Location

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

Azimuth: 117.6°
Max altitude: 10.9°
Azimuth: 242.4°