Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 6:36  ☀️ Transit: 13:02  🌅 Sunset: 19:29

45 Herculis

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

45 Herculis visual magnitude is 5.24. Because of its reltive faintness, 45 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 45 Herculis:

45 Herculis is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of 45 Herculis

45 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 45 Herculis are provided in the following table:

16h 47m 46s
+05° 14’ 48”

The simplified sky map below shows the position of 45 Herculis in the sky:

Finder chart 45 Herculis star
Simplified finder chart for 45 Herculis.

Visibility of 45 Herculis from your location

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

Today's 45 Herculis rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 84.8°
Max altitude: 43.8°
Azimuth: 275.2°
45 Herculis is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 45 Herculis

The image below is a photograph of 45 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 45 Herculis is -0.016 arcsec per year in Right Ascension and -0.041 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 45 Herculis star
DSS2 image of 45 Herculis. The red arrow shows the motion of 45 Herculis during the next 10000 years (-2.67 arcmin in Right Ascension and -6.83 arcmin in declination);

Distance of 45 Herculis from the Sun and relative movement

45 Herculis is distant 459.80 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

141.04 pc
459.80 ly
-16 km/s
-0.016 arcsec/year
-0.041 arcsec/year

Spectral properties of 45 Herculis

45 Herculis belongs to spectral class B9 45 Herculis is also a Cr chemically peculiar star.


The red dot in the diagram below shows where 45 Herculis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 45 Herculis. Attribution: Richard Powell / CC BY-SA

45 Herculis star system properties

45 Herculis is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 45 Herculis double sysyem:

122.7 arcsec

Alternative designations of 45 Herculis

45 Herculis