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public  Ti Port-de-Paix, Haiti Ti Port-de-Paix, Haiti  ⓘ
TimezoneAmerica/Port-au-Prince
Sunrise: 6:16 
Transit: 12:55 
Sunset: 19:33
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All Constellations » Boötes » 

τ Boötis (tau Boötis)

Below the horizon.  Rise: 13:34 | Tran: 20:02 | Set: 2:26
Alt: -1.92°   Az: 70.78°   Direction: East-North-East

τ Boötis is a variable and double sub-giant star of spectral class F6 in the constellation of Boötes.

τ Boötis visual magnitude is 4.5. Because of its moderate brightness, τ Boötis 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 Boötis (tau Boötis) star
DSS2 image of τ Boötis. The red arrow shows the motion of τ Boötis during the next 1000 years (-8.03 arcmin in Right Ascension and 0.68 arcmin in declination);

Celestial Coordinates

Apparent

13h 48m 29s
+17° 19’ 48”
17h 25m 23s
07h 13m 52s

J2000

13h 47m 15s
+17° 27’ 24”

Galactic Coordinates

358.95°
73.88°

Finder Chart

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Finder chart for τ Boötis (tau Boötis).

Magnitude, Color, Spectral Class

4.5
Sub-giant

3.53
F6IV
6481K

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

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

Star System Properties

τ Boötis 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 Boötis double sysyem:

4.5
12
7.5
5 arcsec

Distance, Radial Speed, Proper Motion

τ Boötis is distant 50.84 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

15.60
50.84
-16 km/s
-0.482 arcsec/y
0.041"/y

Alternative Designations

τ Boötis
(tau Boötis)
SAO100706
SAO100706
Gl 527 A

Visibility from Your Location

Today's τ Boötis (tau Boötis) rise, transit and set times from Ti Port-de-Paix, Haiti are the following (all times relative to the local timezone America/Port-au-Prince):

Azimuth: 72.7°
Max altitude: 87.4°
Azimuth: 287.3°