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: 6:47  
clear_day Transit: 12:50  
SunsetSet: 18:52 south
sunny DaytimeWhat's Visible Now
All Constellations » Taurus » 


Altitude: -15.9°   Azimuth: 5.1°   Direction: North

HR1831 is a hypergiant star in the constellation of Taurus.

HR1831 visual magnitude is 6.29. Because of its reltive faintness, HR1831 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 HR1831:


HR1831 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -15.9°
Azimuth: 5.1°
Direction: North

Celestial coordinates and finder chart of HR1831

HR1831 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 HR1831 are provided in the following table:

05h 30m 43s
+22° 27’ 44”

The simplified sky map below shows the position of HR1831 in the sky:

Finder chart HR1831 star
Simplified finder chart for HR1831.

Visibility of HR1831 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 HR1831 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: 67.5°
Max altitude: 61.0°
Azimuth: 292.5°

Digitized Sky Survey image of HR1831

The image below is a photograph of HR1831 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 HR1831 is 0.043 arcsec per year in Right Ascension and -0.016 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR1831 star
DSS2 image of HR1831. The red arrow shows the motion of HR1831 during the next 10000 years (7.17 arcmin in Right Ascension and -2.67 arcmin in declination);

Distance of HR1831 from the Sun and relative movement

HR1831 is distant 394.67 light years from the Sun and it is moving far from the Sun at the speed of 2 kilometers per second.

121.07 pc
394.67 ly
2 km/s
0.043 arcsec/year
-0.016 arcsec/year

Spectral properties of HR1831

HR1831 belongs to spectral class K0


The red dot in the diagram below shows where HR1831 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR1831. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR1831