Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:59  
clear_day Transit: 12:48  
SunsetSet: 18:36 south
sunny DaytimeWhat's Visible Now
All Constellations » Hercules » 

30 Herculis

Altitude: 48.1°   Azimuth: 78.2°   Direction: East-North-East

30 Herculis is a variable giant star in the constellation of Hercules.

30 Herculis visual magnitude is 5.04. Because of its reltive faintness, 30 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 30 Herculis:


30 Herculis is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 48.1°
Azimuth: 78.2°
Direction: East-North-East

Celestial coordinates and finder chart of 30 Herculis

30 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 30 Herculis are provided in the following table:

16h 28m 38s
+41° 52’ 54”

The simplified sky map below shows the position of 30 Herculis in the sky:

Finder chart 30 Herculis star
Simplified finder chart for 30 Herculis.

Visibility of 30 Herculis from your location

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

30 Herculis is circumpolar and transits at 15:48 UTC (altitude: 80.4°)

Digitized Sky Survey image of 30 Herculis

The image below is a photograph of 30 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 30 Herculis is 0.03 arcsec per year in Right Ascension and -0.009 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 30 Herculis star
DSS2 image of 30 Herculis. The red arrow shows the motion of 30 Herculis during the next 10000 years (5.00 arcmin in Right Ascension and -1.50 arcmin in declination);

Distance of 30 Herculis from the Sun and relative movement

30 Herculis is distant 361.02 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

110.74 pc
361.02 ly
3 km/s
0.03 arcsec/year
-0.009 arcsec/year

Spectral properties of 30 Herculis

30 Herculis belongs to spectral class M6 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 30 Herculis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 30 Herculis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 30 Herculis

30 Herculis