Your Guide to the Solar System and the Night Sky
This site is free and ad-free thanks to the support of our users. If you can, please consider a donation.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:47  
clear_day Transit: 12:50  
SunsetSet: 18:52 south
sunny DaytimeWhat's Visible Now
All Constellations » Sagittarius » 


Altitude: 2.0°   Azimuth: 170.6°   Direction: South

HR6739 is a double giant star in the constellation of Sagittarius.

HR6739 visual magnitude is 6. Because of its reltive faintness, HR6739 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 HR6739:


HR6739 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 2.0°
Azimuth: 170.6°
Direction: South

Celestial coordinates and finder chart of HR6739

HR6739 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR6739 are provided in the following table:

18h 04m 50s
-35° 54’ 05”

The simplified sky map below shows the position of HR6739 in the sky:

Finder chart HR6739 star
Simplified finder chart for HR6739.

Visibility of HR6739 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 HR6739 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: 125.9°
Max altitude: 2.6°
Azimuth: 234.1°

Digitized Sky Survey image of HR6739

The image below is a photograph of HR6739 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 HR6739 is -0.016 arcsec per year in Right Ascension and -0.035 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR6739 star
DSS2 image of HR6739. The red arrow shows the motion of HR6739 during the next 10000 years (-2.67 arcmin in Right Ascension and -5.83 arcmin in declination);

Distance of HR6739 from the Sun and relative movement

HR6739 is distant 355.12 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

108.93 pc
355.12 ly
-16 km/s
-0.016 arcsec/year
-0.035 arcsec/year

Spectral properties of HR6739

HR6739 belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR6739 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR6739. Attribution: Richard Powell / CC BY-SA

HR6739 star system properties

HR6739 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 HR6739 double sysyem:

12.5 arcsec

Alternative designations of HR6739