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: 6:59  
clear_day Transit: 12:48  
SunsetSet: 18:36 south
sunny DaytimeWhat's Visible Now
All Constellations » Hercules » 


Altitude: 35.8°   Azimuth: 73.5°   Direction: East-North-East

HR6491 is a double giant star in the constellation of Hercules.

HR6491 visual magnitude is 6.28. Because of its reltive faintness, HR6491 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 HR6491:


HR6491 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 35.8°
Azimuth: 73.5°
Direction: East-North-East

Celestial coordinates and finder chart of HR6491

HR6491 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 HR6491 are provided in the following table:

17h 24m 27s
+36° 57’ 06”

The simplified sky map below shows the position of HR6491 in the sky:

Finder chart HR6491 star
Simplified finder chart for HR6491.

Visibility of HR6491 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 HR6491 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: 53.0°
Max altitude: 75.5°
Azimuth: 307.0°

Digitized Sky Survey image of HR6491

The image below is a photograph of HR6491 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 HR6491 is -0.026 arcsec per year in Right Ascension and 0.047 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR6491 star
DSS2 image of HR6491. The red arrow shows the motion of HR6491 during the next 10000 years (-4.33 arcmin in Right Ascension and 7.83 arcmin in declination);

Distance of HR6491 from the Sun and relative movement

HR6491 is distant 683.44 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

209.64 pc
683.44 ly
-16 km/s
-0.026 arcsec/year
0.047 arcsec/year

Spectral properties of HR6491

HR6491 belongs to spectral class G5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR6491 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR6491. Attribution: Richard Powell / CC BY-SA

HR6491 star system properties

HR6491 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR6491 double sysyem:

33.2 arcsec

Alternative designations of HR6491