We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
Help keep this site free and ads-free: donate now!
public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:58 
Sunset: 21:15
sunny   (Daytime)   What's Visible Now?

51 Herculis

Below the horizon.  Rise: 15:58 | Tran: 0:16 | Set: 8:38
Altitude: -13.8°   Azimuth: 3.8°   Direction: North

51 Herculis is a hypergiant star of spectral class K0 in the constellation of Hercules.

51 Herculis visual magnitude is 5.04. Because of its faintness, 51 Herculis is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

Celestial coordinates and finder chart of 51 Herculis

Finder chart 51 Herculis star
Simplified finder chart for 51 Herculis.

51 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 51 Herculis are provided in the following table:

16h 51m 45s
+24° 39’ 23”
Image of 51 Herculis star
DSS2 image of 51 Herculis. The red arrow shows the motion of 51 Herculis during the next 10000 years (1.83 arcmin in Right Ascension and 1.00 arcmin in declination);

Key facts about 51 Herculis


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


The red dot in the diagram below shows where 51 Herculis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 51 Herculis. Attribution: Richard Powell / CC BY-SA

Distance of 51 Herculis from the Sun and relative movement

51 Herculis is distant 758.14 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

232.56 pc
758.14 ly
-16 km/s
0.011 arcsec/year
0.006 arcsec/year

Alternative designations of 51 Herculis

51 Herculis

Visibility of 51 Herculis from your location

Today's 51 Herculis rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):

Azimuth: 65.3°
Max altitude: 63.2°
Azimuth: 294.7°