Your guide to the Solar System and the night sky
🌎  Greenwich, United Kingdom [change]

39 Herculis

39 Herculis is a giant star in the constellation of Hercules.

39 Herculis visual magnitude is 5.92. Because of its reltive faintness, 39 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 39 Herculis:

39 Herculis is above the horizon from Greenwich, United Kingdom [change]. Altitude: 8°.

Celestial coordinates and finder chart of 39 Herculis

39 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 39 Herculis are provided in the following table:

16h 41m 36s
+26° 55’ 00”

The simplified sky map below shows the position of 39 Herculis in the sky:

Finder chart 39 Herculis star
Simplified finder chart for 39 Herculis.

Visibility of 39 Herculis from your location

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

Today's 39 Herculis rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 63.1°
Max altitude: 65.4°
Azimuth: 296.9°
39 Herculis is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 39 Herculis

The image below is a photograph of 39 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 39 Herculis is 0.002 arcsec per year in Right Ascension and -0.044 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 39 Herculis star
DSS2 image of 39 Herculis. The red arrow shows the motion of 39 Herculis during the next 10000 years (0.33 arcmin in Right Ascension and -7.33 arcmin in declination);

Distance of 39 Herculis from the Sun and relative movement

39 Herculis is distant 139.61 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

42.83 pc
139.61 ly
-12 km/s
0.002 arcsec/year
-0.044 arcsec/year

Spectral properties of 39 Herculis

39 Herculis belongs to spectral class F2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 39 Herculis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 39 Herculis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 39 Herculis

39 Herculis