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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: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Perseus » 

31 Persei

Altitude: 15.3°   Azimuth: 21.0°   Direction: North-North-East

31 Persei is a main-sequence star in the constellation of Perseus.

31 Persei visual magnitude is 5.03. Because of its reltive faintness, 31 Persei 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 31 Persei:


31 Persei is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 15.3°
Azimuth: 21.0°
Direction: North-North-East

Celestial coordinates and finder chart of 31 Persei

31 Persei is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 31 Persei are provided in the following table:

03h 19m 07s
+50° 05’ 41”

The simplified sky map below shows the position of 31 Persei in the sky:

Finder chart 31 Persei star
Simplified finder chart for 31 Persei.

Visibility of 31 Persei from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

31 Persei is circumpolar and transits at 22:05 UTC (altitude: 88.6°)

Digitized Sky Survey image of 31 Persei

The image below is a photograph of 31 Persei 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 31 Persei is 0.023 arcsec per year in Right Ascension and -0.025 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 31 Persei star
DSS2 image of 31 Persei. The red arrow shows the motion of 31 Persei during the next 10000 years (3.83 arcmin in Right Ascension and -4.17 arcmin in declination);

Distance of 31 Persei from the Sun and relative movement

31 Persei is distant 480.83 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

147.49 pc
480.83 ly
3 km/s
0.023 arcsec/year
-0.025 arcsec/year

Spectral properties of 31 Persei

31 Persei belongs to spectral class B5 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 31 Persei is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 31 Persei. Attribution: Richard Powell / CC BY-SA

Alternative designations of 31 Persei