40 Persei is a double hypergiant star in the constellation of Perseus.
40 Persei visual magnitude is 4.97. Because of its moderate brightness, 40 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 40 Persei:
Celestial coordinates and finder chart of 40 Persei
40 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 40 Persei are provided in the following table:
The simplified sky map below shows the position of 40 Persei in the sky:
Visibility of 40 Persei from your location
Digitized Sky Survey image of 40 Persei
The image below is a photograph of 40 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 40 Persei is -0.005 arcsec per year in Right Ascension and -0.009 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.
Distance of 40 Persei from the Sun and relative movement
40 Persei is distant 923.51 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.
Spectral properties of 40 Persei
40 Persei belongs to spectral class B0 and has a luminosity class of V corresponding to a hypergiant star.
The red dot in the diagram below shows where 40 Persei is situated in the Hertzsprung–Russell diagram.
40 Persei star system properties
40 Persei is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 40 Persei double sysyem: