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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: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sleep NighttimeWhat's Visible Now?
All Constellations » Hercules » 


Altitude: -3.9°   Azimuth: 300.8°   Direction: West-North-West

HR6665 is a multiple hypergiant star in the constellation of Hercules.

HR6665 visual magnitude is 6.46. Because of its reltive faintness, HR6665 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 HR6665:


HR6665 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -3.9°
Azimuth: 300.8°
Direction: West-North-West

Celestial coordinates and finder chart of HR6665

HR6665 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 HR6665 are provided in the following table:

17h 51m 58s
+15° 19’ 32”

The simplified sky map below shows the position of HR6665 in the sky:

Finder chart HR6665 star
Simplified finder chart for HR6665.

Visibility of HR6665 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 HR6665 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: 74.7°
Max altitude: 53.8°
Azimuth: 285.3°

Digitized Sky Survey image of HR6665

The image below is a photograph of HR6665 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 HR6665 is 0 arcsec per year in Right Ascension and 0.031 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR6665 star
DSS2 image of HR6665. The red arrow shows the motion of HR6665 during the next 10000 years (0.00 arcmin in Right Ascension and 5.17 arcmin in declination);

Distance of HR6665 from the Sun and relative movement

HR6665 is distant 440.54 light years from the Sun and it is moving towards the Sun at the speed of 43 kilometers per second.

135.14 pc
440.54 ly
-43 km/s
0.031 arcsec/year

Spectral properties of HR6665

HR6665 belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR6665 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR6665. Attribution: Richard Powell / CC BY-SA

HR6665 star system properties

HR6665 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR6665 double sysyem:

0.8 arcsec

Alternative designations of HR6665