20 Persei is a variable and multiple sub-giant star in the constellation of Perseus.
20 Persei visual magnitude is 5.33. Because of its reltive faintness, 20 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 20 Persei:
20 Persei is above the horizon from Greenwich, United Kingdom .
Celestial coordinates and finder chart of 20 Persei
20 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 20 Persei are provided in the following table:
The simplified sky map below shows the position of 20 Persei in the sky:
Visibility of 20 Persei from your location
Location: Greenwich, United Kingdom
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Today's 20 Persei rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):
Digitized Sky Survey image of 20 Persei
The image below is a photograph of 20 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 20 Persei is 0.047 arcsec per year in Right Ascension and -0.077 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of 20 Persei from the Sun and relative movement
20 Persei is distant 235.04 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.
Spectral properties of 20 Persei
20 Persei belongs to spectral class F4 and has a luminosity class of IV corresponding to a sub-giant star.
The red dot in the diagram below shows where 20 Persei is situated in the Hertzsprung–Russell diagram.
20 Persei star system properties
20 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 20 Persei double sysyem: