ε Herculis (epsilon Herculis)
ε Herculis is a hypergiant star in the constellation of Hercules.
ε Herculis visual magnitude is 3.92. Because of its moderate brightness, ε Herculis should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.
The table below summarizes the key facts about ε Herculis:
Celestial coordinates and finder chart of ε Herculis
ε 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 ε Herculis are provided in the following table:
The simplified sky map below shows the position of ε Herculis in the sky:
Visibility of ε Herculis from your location
Digitized Sky Survey image of ε Herculis
The image below is a photograph of ε Herculis from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of ε Herculis is -0.047 arcsec per year in Right Ascension and 0.028 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of ε Herculis from the Sun and relative movement
ε Herculis is distant 162.67 light years from the Sun and it is moving towards the Sun at the speed of 25 kilometers per second.
Spectral properties of ε Herculis
ε Herculis belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.
The red dot in the diagram below shows where ε Herculis is situated in the Hertzsprung–Russell diagram.