We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
Help keep this site free and ads-free: donate now!
public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:59 
Sunset: 21:17
sunny   (Daytime)   What's Visible Now?

101 Herculis

Below the horizon.  Rise: 17:31 | Tran: 1:21 | Set: 9:08
Altitude: -17.7°   Azimuth: 12.0°   Direction: North-North-East

101 Herculis is a giant star of spectral class A8 in the constellation of Hercules.

101 Herculis visual magnitude is 5.1. Because of its faintness, 101 Herculis is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

Celestial coordinates and finder chart of 101 Herculis

Finder chart 101 Herculis star
Simplified finder chart for 101 Herculis.

101 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 101 Herculis are provided in the following table:

18h 08m 52s
+20° 02’ 43”
Image of 101 Herculis star
DSS2 image of 101 Herculis. The red arrow shows the motion of 101 Herculis during the next 10000 years (1.33 arcmin in Right Ascension and -3.33 arcmin in declination);

Key facts about 101 Herculis


and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 101 Herculis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 101 Herculis. Attribution: Richard Powell / CC BY-SA

Distance of 101 Herculis from the Sun and relative movement

101 Herculis is distant 320.87 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

98.43 pc
320.87 ly
-16 km/s
0.008 arcsec/year
-0.02 arcsec/year

Alternative designations of 101 Herculis

101 Herculis

Visibility of 101 Herculis from your location

Today's 101 Herculis rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):

Azimuth: 70.0°
Max altitude: 58.6°
Azimuth: 290.0°