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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
north SunriseRise: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
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All Constellations » Hercules » 

φ Herculis (phi Herculis)

Altitude: 81.0°   Azimuth: 226.7°   Direction: South-West

φ Herculis is a variable star in the constellation of Hercules.

φ Herculis visual magnitude is 4.26. Because of its moderate brightness, φ Herculis should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about φ Herculis:


φ Herculis (phi Herculis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 81.0°
Azimuth: 226.7°
Direction: South-West

Celestial coordinates and finder chart of φ Herculis

φ 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 φ Herculis are provided in the following table:

16h 08m 46s
+44° 56’ 06”

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

Finder chart φ Herculis (phi Herculis) star
Simplified finder chart for φ Herculis (phi Herculis).

Visibility of φ Herculis from your location

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

φ Herculis (phi Herculis) is circumpolar and transits at 10:53 UTC (altitude: 83.5°)

Digitized Sky Survey image of φ Herculis

The image below is a photograph of φ 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 φ Herculis is -0.025 arcsec per year in Right Ascension and 0.038 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of φ Herculis (phi Herculis) star
DSS2 image of φ Herculis. The red arrow shows the motion of φ Herculis during the next 10000 years (-4.17 arcmin in Right Ascension and 6.33 arcmin in declination);

Distance of φ Herculis from the Sun and relative movement

φ Herculis is distant 228.45 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

70.08 pc
228.45 ly
-16 km/s
-0.025 arcsec/year
0.038 arcsec/year

Spectral properties of φ Herculis

φ Herculis belongs to spectral class B9 φ Herculis is also a Mn chemically peculiar star.


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

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

Alternative designations of φ Herculis

φ Herculis
(phi Herculis)
11 Herculis