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public LocationGreenwich, UK
Sunrise: 4:57 
Transit: 13:04 
Sunset: 21:10
sunny   (Daytime)   What's Visible Now?
All Constellations » Hercules » 

109 Herculis

Below the horizon.  Rise: 16:00 | Tran: 23:58 | Set: 8:00
Altitude: -0.2°   Azimuth: 53.1°   Direction: North-East

109 Herculis is a variable and double giant star of spectral class K2 in the constellation of Hercules.

109 Herculis visual magnitude is 3.84. Because of its moderate brightness, 109 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 109 Herculis

Finder chart 109 Herculis star
Simplified finder chart for 109 Herculis.

109 Herculis is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 109 Herculis are provided in the following table:

18h 23m 41s
+21° 46’ 10”
Image of 109 Herculis star
DSS2 image of 109 Herculis. The red arrow shows the motion of 109 Herculis during the next 1000 years (3.27 arcmin in Right Ascension and -4.03 arcmin in declination);

Key facts about 109 Herculis


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


The red dot in the diagram below shows where 109 Herculis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 109 Herculis. Attribution: Richard Powell / CC BY-SA

109 Herculis star system properties

109 Herculis 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 109 Herculis double sysyem:

221.8 arcsec

Distance of 109 Herculis from the Sun and relative movement

109 Herculis is distant 128.35 light years from the Sun and it is moving towards the Sun at the speed of 58 kilometers per second.

39.37 pc
128.35 ly
-58 km/s
0.196 arcsec/year
-0.242 arcsec/year

Alternative designations of 109 Herculis

109 Herculis

Visibility of 109 Herculis from your location

Today's 109 Herculis rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 68.2°
Max altitude: 60.3°
Azimuth: 291.8°