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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:11 
Transit: 13:06 
Sunset: 21:00
sunny   (Daytime)   What's Visible Now?
All Constellations » Hercules » 

σ Herculis (sigma Herculis)

Above the horizon.  Circumpolar today
Alt: 4.16°   Az: 353.73°   Direction: North

σ Herculis is a variable and double main-sequence star of spectral class B9 in the constellation of Hercules.

σ Herculis visual magnitude is 4.2. Because of its moderate brightness, σ 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.

Image of σ Herculis (sigma Herculis) star
DSS2 image of σ Herculis. The red arrow shows the motion of σ Herculis during the next 10000 years (-1.83 arcmin in Right Ascension and 7.67 arcmin in declination);

Celestial Coordinates

Apparent

16h 34m 53s
+42° 23’ 13”
11h 26m 05s
04h 00m 58s

J2000

16h 34m 06s
+42° 26’ 12”

Galactic Coordinates

66.91°
42.7°

Finder Chart

Finder chart σ Herculis (sigma Herculis) star
Simplified finder chart for σ Herculis (sigma Herculis).

Magnitude, Color, Spectral Class

4.2
Main-sequence

-0.63
B9V
10252K

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

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

Star System Properties

σ 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 σ Herculis double sysyem:

4.2
7.2
3
0.1 arcsec

Distance, Radial Speed, Proper Motion

σ Herculis is distant 302.13 light years from the Sun and it is moving towards the Sun at the speed of 11 kilometers per second.

92.68
302.13
-11 km/s
-0.011 arcsec/y
0.046"/y

Alternative Designations

σ Herculis
(sigma Herculis)
35 Herculis
SAO46161
SAO46161

Visibility from Your Location

σ Herculis (sigma Herculis) is circumpolar and transits at 20:30 UTC (altitude: 80.9°)