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public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:59 
Sunset: 21:17
wb_twilight   (Civil Twilight)   What's Visible Now?

θ Herculis (theta Herculis)

Above the horizon.  Rise: 14:17 | Tran: 1:09 | Set: 11:56
Altitude: 51.9°   Azimuth: 268.4°   Direction: West

θ Herculis is a variable bright giant star of spectral class K1 in the constellation of Hercules.

θ Herculis visual magnitude is 3.86. Because of its moderate brightness, θ Herculis 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 θ Herculis

Finder chart θ Herculis (theta Herculis) star
Simplified finder chart for θ Herculis (theta Herculis).

θ Herculis 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 θ Herculis are provided in the following table:

17h 56m 15s
+37° 15’ 02”
Image of θ Herculis (theta Herculis) star
DSS2 image of θ Herculis. The red arrow shows the motion of θ Herculis during the next 100000 years (6.67 arcmin in Right Ascension and 10.00 arcmin in declination);

Key facts about θ Herculis

Bright giant

and has a luminosity class of II corresponding to a bright giant star.


The red dot in the diagram below shows where θ Herculis is situated in the Hertzsprung–Russell diagram.

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

Distance of θ Herculis from the Sun and relative movement

θ Herculis is distant 669.40 light years from the Sun and it is moving towards the Sun at the speed of 27 kilometers per second.

205.34 pc
669.40 ly
-27 km/s
0.004 arcsec/year
0.006 arcsec/year

Alternative designations of θ Herculis

θ Herculis
(theta Herculis)
91 Herculis

Visibility of θ Herculis from your location

Today's θ Herculis (theta Herculis) rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):

Azimuth: 52.7°
Max altitude: 75.8°
Azimuth: 307.3°