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: 4:45  
clear_day Transit: 12:57  
SunsetSet: 21:09 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Perseus » 

17 Persei

Altitude: -1.5°   Azimuth: 17.2°   Direction: North-North-East

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 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 17 Persei:


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

Altitude: -1.5°
Azimuth: 17.2°
Direction: North-North-East

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°
17 Persei is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 17 Persei

The image below is a photograph of 17 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 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);

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