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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: 6:59  
clear_day Transit: 12:12  
SunsetSet: 17:25
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All Constellations » Hercules » 

90 Herculis

Altitude: 5.3°   Azimuth: 336.8°   Direction: North-North-West

90 Herculis is a variable and double giant star in the constellation of Hercules.

90 Herculis visual magnitude is 5.16. Because of its reltive faintness, 90 Herculis should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The proper motion of 90 Herculis is 0.011 arcsec per year in Right Ascension and 0.053 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 90 Herculis star
DSS2 image of 90 Herculis. The red arrow shows the motion of 90 Herculis during the next 10000 years (1.83 arcmin in Right Ascension and 8.83 arcmin in declination);

Key facts about 90 Herculis


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

Altitude: 5.3°
Azimuth: 336.8°
Direction: North-North-West

Celestial coordinates and finder chart of 90 Herculis

90 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 90 Herculis are provided in the following table:

17h 53m 18s
+40° 00’ 29”

The simplified sky map below shows the position of 90 Herculis in the sky:

Finder chart 90 Herculis star
Simplified finder chart for 90 Herculis.

Visibility of 90 Herculis from your location

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

90 Herculis is circumpolar and transits at 07:42 UTC (altitude: 78.5°)

Distance of 90 Herculis from the Sun and relative movement

90 Herculis is distant 363.43 light years from the Sun and it is moving towards the Sun at the speed of 35 kilometers per second.

111.48 pc
363.43 ly
-35 km/s
0.011 arcsec/year
0.053 arcsec/year

Spectral properties of 90 Herculis

90 Herculis belongs to spectral class K1 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 90 Herculis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 90 Herculis. Attribution: Richard Powell / CC BY-SA

90 Herculis star system properties

90 Herculis is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the 90 Herculis double sysyem:

1.6 arcsec

Alternative designations of 90 Herculis

90 Herculis