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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
SunriseRise: 6:42  
clear_day Transit: 12:10  
SunsetSet: 17:40
sunny DaytimeWhat's Visible Now?
All Constellations » Sagittarius » 


Altitude: -21.0°   Azimuth: 266.4°   Direction: West

HR6841 is a double giant star in the constellation of Sagittarius.

HR6841 visual magnitude is 6.54. Because of its reltive faintness, HR6841 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR6841 is -0.003 arcsec per year in Right Ascension and 0 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR6841 star
DSS2 image of HR6841. The red arrow shows the motion of HR6841 during the next 100000 years (-5.00 arcmin in Right Ascension and 0.00 arcmin in declination);

Key facts about HR6841


HR6841 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -21.0°
Azimuth: 266.4°
Direction: West

Celestial coordinates and finder chart of HR6841

HR6841 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 HR6841 are provided in the following table:

18h 17m 28s
-18° 27’ 47”

The simplified sky map below shows the position of HR6841 in the sky:

Finder chart HR6841 star
Simplified finder chart for HR6841.

Visibility of HR6841 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 HR6841 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: 108.5°
Max altitude: 20.1°
Azimuth: 251.5°

Distance of HR6841 from the Sun and relative movement

HR6841 is distant 6,653.06 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

2,040.82 pc
6,653.06 ly
1 km/s
-0.003 arcsec/year

Spectral properties of HR6841

HR6841 belongs to spectral class O7 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR6841 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR6841. Attribution: Richard Powell / CC BY-SA

HR6841 star system properties

HR6841 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR6841 double sysyem:

8.4 arcsec

Alternative designations of HR6841