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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
SunriseRise: 6:38  
clear_day Transit: 12:10  
SunsetSet: 17:43
sleep NighttimeWhat's Visible Now?
All Constellations » Perseus » 

17 Persei

Altitude: 28.3°   Azimuth: 291.8°   Direction: West-North-West

17 Persei is a variable giant star in the constellation of Perseus.

17 Persei visual magnitude is 4.53. Because of its moderate brightness, 17 Persei should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of 17 Persei is 0.009 arcsec per year in Right Ascension and -0.061 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 17 Persei star
DSS2 image of 17 Persei. The red arrow shows the motion of 17 Persei during the next 10000 years (1.50 arcmin in Right Ascension and -10.17 arcmin in declination);

Key facts about 17 Persei


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

Altitude: 28.3°
Azimuth: 291.8°
Direction: West-North-West

Celestial coordinates and finder chart of 17 Persei

17 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 17 Persei are provided in the following table:

02h 51m 30s
+35° 03’ 34”

The simplified sky map below shows the position of 17 Persei in the sky:

Finder chart 17 Persei star
Simplified finder chart for 17 Persei.

Visibility of 17 Persei 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 17 Persei 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: 54.9°
Max altitude: 73.6°
Azimuth: 305.1°

Distance of 17 Persei from the Sun and relative movement

17 Persei is distant 409.03 light years from the Sun and it is moving far from the Sun at the speed of 14 kilometers per second.

125.47 pc
409.03 ly
14 km/s
0.009 arcsec/year
-0.061 arcsec/year

Spectral properties of 17 Persei

17 Persei belongs to spectral class K5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 17 Persei is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 17 Persei. Attribution: Richard Powell / CC BY-SA

Alternative designations of 17 Persei