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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
SunriseRise: 6:40  
clear_day Transit: 12:10  
SunsetSet: 17:41
sunny DaytimeWhat's Visible Now?
All Constellations » Hercules » 

ο Herculis (omicron Herculis)

Altitude: 27.9°   Azimuth: 282.1°   Direction: West-North-West

ο Herculis is a variable main-sequence star in the constellation of Hercules.

ο Herculis visual magnitude is 3.83. Because of its moderate brightness, ο Herculis should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of ο Herculis is 0.001 arcsec per year in Right Ascension and 0.009 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of ο Herculis (omicron Herculis) star
DSS2 image of ο Herculis. The red arrow shows the motion of ο Herculis during the next 100000 years (1.67 arcmin in Right Ascension and 15.00 arcmin in declination);

Key facts about ο Herculis


ο Herculis (omicron Herculis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 27.9°
Azimuth: 282.1°
Direction: West-North-West

Celestial coordinates and finder chart of ο Herculis

ο 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 ο Herculis are provided in the following table:

18h 07m 32s
+28° 45’ 44”

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

Finder chart ο Herculis (omicron Herculis) star
Simplified finder chart for ο Herculis (omicron Herculis).

Visibility of ο 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 ο Herculis (omicron 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: 61.2°
Max altitude: 67.3°
Azimuth: 298.8°

Distance of ο Herculis from the Sun and relative movement

ο Herculis is distant 347.18 light years from the Sun and it is moving towards the Sun at the speed of 30 kilometers per second.

106.50 pc
347.18 ly
-30 km/s
0.001 arcsec/year
0.009 arcsec/year

Spectral properties of ο Herculis

ο Herculis belongs to spectral class B9 and has a luminosity class of V corresponding to a main-sequence star.


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

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

Alternative designations of ο Herculis

ο Herculis
(omicron Herculis)
103 Herculis