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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
north SunriseRise: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Hercules » 

α2 Herculis (alpha2 Herculis)

Altitude: 52.8°   Azimuth: 184.3°   Direction: South

α2 Herculis is a multiple giant star in the constellation of Hercules.

α2 Herculis visual magnitude is 5.39. Because of its reltive faintness, α2 Herculis should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about α2 Herculis:


α2 Herculis (alpha2 Herculis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 52.8°
Azimuth: 184.3°
Direction: South

Celestial coordinates and finder chart of α2 Herculis

α2 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 α2 Herculis are provided in the following table:

17h 14m 39s
+14° 23’ 24”

The simplified sky map below shows the position of α2 Herculis in the sky:

Finder chart α2 Herculis (alpha2 Herculis) star
Simplified finder chart for α2 Herculis (alpha2 Herculis).

Visibility of α2 Herculis from your location

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

Today's α2 Herculis (alpha2 Herculis) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 75.6°
Max altitude: 52.9°
Azimuth: 284.4°

Digitized Sky Survey image of α2 Herculis

The image below is a photograph of α2 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 α2 Herculis is -0.003 arcsec per year in Right Ascension and 0.045 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of α2 Herculis (alpha2 Herculis) star
DSS2 image of α2 Herculis. The red arrow shows the motion of α2 Herculis during the next 10000 years (-0.50 arcmin in Right Ascension and 7.50 arcmin in declination);

Spectral properties of α2 Herculis

α2 Herculis belongs to spectral class G5 and has a luminosity class of III corresponding to a giant star.


α2 Herculis star system properties

α2 Herculis is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the α2 Herculis double sysyem:

4.9 arcsec

Alternative designations of α2 Herculis

α2 Herculis
(alpha2 Herculis)
64 Herculis