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: 6:59  
clear_day Transit: 12:48  
SunsetSet: 18:36 south
sunny DaytimeWhat's Visible Now
All Constellations » Cetus » 


Altitude: -46.8°   Azimuth: 34.2°   Direction: North-East

HR31 is a hypergiant star in the constellation of Cetus.

HR31 visual magnitude is 5.85. Because of its reltive faintness, HR31 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 HR31:


HR31 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -46.8°
Azimuth: 34.2°
Direction: North-East

Celestial coordinates and finder chart of HR31

HR31 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 HR31 are provided in the following table:

00h 10m 42s
-12° 34’ 48”

The simplified sky map below shows the position of HR31 in the sky:

Finder chart HR31 star
Simplified finder chart for HR31.

Visibility of HR31 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 HR31 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: 102.6°
Max altitude: 25.9°
Azimuth: 257.4°

Digitized Sky Survey image of HR31

The image below is a photograph of HR31 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 HR31 is 0.15 arcsec per year in Right Ascension and -0.038 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR31 star
DSS2 image of HR31. The red arrow shows the motion of HR31 during the next 1000 years (2.50 arcmin in Right Ascension and -0.63 arcmin in declination);

Distance of HR31 from the Sun and relative movement

HR31 is distant 212.38 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

65.15 pc
212.38 ly
6 km/s
0.15 arcsec/year
-0.038 arcsec/year

Spectral properties of HR31

HR31 belongs to spectral class K0 and has a luminosity class of IV corresponding to a hypergiant star.


The red dot in the diagram below shows where HR31 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR31. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR31