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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
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Canis Major » 


Altitude: -47.3°   Azimuth: 53.8°   Direction: North-East

HR2831 is a double supergiant star in the constellation of Canis Major.

HR2831 visual magnitude is 6.24. Because of its reltive faintness, HR2831 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 HR2831:


HR2831 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -47.3°
Azimuth: 53.8°
Direction: North-East

Celestial coordinates and finder chart of HR2831

HR2831 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 HR2831 are provided in the following table:

07h 24m 50s
-19° 00’ 43”
Canis Major

The simplified sky map below shows the position of HR2831 in the sky:

Finder chart HR2831 star
Simplified finder chart for HR2831.

Visibility of HR2831 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 HR2831 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: 109.0°
Max altitude: 19.5°
Azimuth: 251.0°

Digitized Sky Survey image of HR2831

The image below is a photograph of HR2831 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 HR2831 is -0.021 arcsec per year in Right Ascension and 0.005 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR2831 star
DSS2 image of HR2831. The red arrow shows the motion of HR2831 during the next 10000 years (-3.50 arcmin in Right Ascension and 0.83 arcmin in declination);

Distance of HR2831 from the Sun and relative movement

HR2831 is distant 1,781.42 light years from the Sun and it is moving far from the Sun at the speed of 70 kilometers per second.

546.45 pc
1,781.42 ly
70 km/s
-0.021 arcsec/year
0.005 arcsec/year

Spectral properties of HR2831

HR2831 belongs to spectral class A2 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where HR2831 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR2831. Attribution: Richard Powell / CC BY-SA

HR2831 star system properties

HR2831 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR2831 double sysyem:

2.7 arcsec

Alternative designations of HR2831