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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: 7:43  
clear_day Transit: 11:47  
SunsetSet: 15:52 south
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All Constellations » Perseus » 

12 Persei

Altitude: 44.3°   Azimuth: 282.9°   Direction: West-North-West

12 Persei is a variable and double main-sequence star in the constellation of Perseus.

12 Persei visual magnitude is 4.91. Because of its moderate brightness, 12 Persei should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about 12 Persei:


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

Altitude: 44.3°
Azimuth: 282.9°
Direction: West-North-West

Celestial coordinates and finder chart of 12 Persei

12 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 12 Persei are provided in the following table:

02h 42m 14s
+40° 11’ 38”

The simplified sky map below shows the position of 12 Persei in the sky:

Finder chart 12 Persei star
Simplified finder chart for 12 Persei.

Visibility of 12 Persei from your location

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

12 Persei is circumpolar and transits at 21:56 UTC (altitude: 78.7°)

Digitized Sky Survey image of 12 Persei

The image below is a photograph of 12 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 12 Persei is -0.019 arcsec per year in Right Ascension and -0.186 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 12 Persei star
DSS2 image of 12 Persei. The red arrow shows the motion of 12 Persei during the next 1000 years (-0.32 arcmin in Right Ascension and -3.10 arcmin in declination);

Distance of 12 Persei from the Sun and relative movement

12 Persei is distant 80.45 light years from the Sun and it is moving towards the Sun at the speed of 23 kilometers per second.

24.68 pc
80.45 ly
-23 km/s
-0.019 arcsec/year
-0.186 arcsec/year

Spectral properties of 12 Persei

12 Persei belongs to spectral class F9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 12 Persei is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 12 Persei. Attribution: Richard Powell / CC BY-SA

12 Persei star system properties

12 Persei 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 12 Persei double sysyem:

0.1 arcsec

Alternative designations of 12 Persei

Gl 105.6