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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 7:19 
Transit: 12:14 
Sunset: 17:09
wb_twilight   (Nautical Twilight)  
What's Visible Now • Tonight Timeline
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All Constellations » Hercules » 

ζ Herculis (zeta Herculis)

Below the horizon.  Rise: 21:49 | Tran: 7:11 | Set: 16:30
Alt: -6.26°   Az: 349.46°   Direction: North

ζ Herculis is a variable and double hypergiant star of spectral class G0 in the constellation of Hercules.

ζ Herculis visual magnitude is 2.81. Because of its brightness, ζ Herculis is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Image of ζ Herculis (zeta Herculis) star
DSS2 image of ζ Herculis. The red arrow shows the motion of ζ Herculis during the next 1000 years (-7.83 arcmin in Right Ascension and 6.57 arcmin in declination);

Celestial Coordinates

Apparent

16h 42m 15s
+31° 33’ 22”
11h 10m 42s
03h 52m 57s

J2000

16h 41m 17s
+31° 36’ 11”

Galactic Coordinates

52.66°
40.28°

Finder Chart

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Finder chart for ζ Herculis (zeta Herculis).

Magnitude, Color, Spectral Class

2.81
Hypergiant

2.64
G0IV
5778K

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

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

Star System Properties

ζ Herculis is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the ζ Herculis double sysyem:

2.81
5.41
2.6
1.1 arcsec

Distance, Radial Speed, Proper Motion

ζ Herculis is distant 35.19 light years from the Sun and it is moving towards the Sun at the speed of 70 kilometers per second.

10.80
35.19
-70 km/s
-0.47 arcsec/y
0.394"/y

Alternative Designations

ζ Herculis
(zeta Herculis)
40 Herculis
SAO65485
SAO65485
Gl 635 A

Visibility from Your Location

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

Azimuth: 58.4°
Max altitude: 70.1°
Azimuth: 301.6°