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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:42  
clear_day Transit: 12:10  
SunsetSet: 17:40
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All Constellations » Hercules » 

η Herculis (eta Herculis)

Altitude: 46.4°   Azimuth: 278.3°   Direction: West

η Herculis is a variable giant star in the constellation of Hercules.

η Herculis visual magnitude is 3.53. Because of its moderate brightness, η Herculis should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of η Herculis is 0.037 arcsec per year in Right Ascension and -0.083 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of η Herculis (eta Herculis) star
DSS2 image of η Herculis. The red arrow shows the motion of η Herculis during the next 10000 years (6.17 arcmin in Right Ascension and -13.83 arcmin in declination);

Key facts about η Herculis


η Herculis (eta Herculis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 46.4°
Azimuth: 278.3°
Direction: West

Celestial coordinates and finder chart of η Herculis

η 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 η Herculis are provided in the following table:

16h 42m 53s
+38° 55’ 19”

The simplified sky map below shows the position of η Herculis in the sky:

Finder chart η Herculis (eta Herculis) star
Simplified finder chart for η Herculis (eta Herculis).

Visibility of η Herculis from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

η Herculis (eta Herculis) is circumpolar and transits at 06:00 UTC (altitude: 77.4°)

Distance of η Herculis from the Sun and relative movement

η Herculis is distant 111.99 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

34.35 pc
111.99 ly
8 km/s
0.037 arcsec/year
-0.083 arcsec/year

Spectral properties of η Herculis

η Herculis belongs to spectral class G7 and has a luminosity class of III corresponding to a giant star.


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

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

Alternative designations of η Herculis

η Herculis
(eta Herculis)
44 Herculis