Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:47  
clear_day Transit: 12:50  
SunsetSet: 18:52 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Hercules » 


Altitude: 62.0°   Azimuth: 218.0°   Direction: South-West

HR6904 is a multiple hypergiant star in the constellation of Hercules.

HR6904 visual magnitude is 6.27. Because of its reltive faintness, HR6904 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 HR6904:


HR6904 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 62.0°
Azimuth: 218.0°
Direction: South-West

Celestial coordinates and finder chart of HR6904

HR6904 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 HR6904 are provided in the following table:

18h 24m 58s
+27° 23’ 43”

The simplified sky map below shows the position of HR6904 in the sky:

Finder chart HR6904 star
Simplified finder chart for HR6904.

Visibility of HR6904 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 HR6904 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: 62.6°
Max altitude: 65.9°
Azimuth: 297.4°

Digitized Sky Survey image of HR6904

The image below is a photograph of HR6904 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 HR6904 is 0.002 arcsec per year in Right Ascension and 0.008 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR6904 star
DSS2 image of HR6904. The red arrow shows the motion of HR6904 during the next 100000 years (3.33 arcmin in Right Ascension and 13.33 arcmin in declination);

Distance of HR6904 from the Sun and relative movement

HR6904 is distant 387.63 light years from the Sun and it is moving towards the Sun at the speed of 29 kilometers per second.

118.91 pc
387.63 ly
-29 km/s
0.002 arcsec/year
0.008 arcsec/year

Spectral properties of HR6904

HR6904 belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.


The red dot in the diagram below shows where HR6904 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR6904. Attribution: Richard Powell / CC BY-SA

HR6904 star system properties

HR6904 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR6904 double sysyem:

0.6 arcsec

Alternative designations of HR6904