τ Andromedae (tau Andromedae)
τ Andromedae is a variable and double giant star in the constellation of Andromeda.
τ Andromedae visual magnitude is 4.94. Because of its moderate brightness, τ Andromedae 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 τ Andromedae:
Celestial coordinates and finder chart of τ Andromedae
τ Andromedae 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 τ Andromedae are provided in the following table:
The simplified sky map below shows the position of τ Andromedae in the sky:
Visibility of τ Andromedae from your location
τ Andromedae (tau Andromedae) is circumpolar and transits at 06:59 UTC (altitude: 79.1°)
Digitized Sky Survey image of τ Andromedae
The image below is a photograph of τ Andromedae 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 τ Andromedae is 0.013 arcsec per year in Right Ascension and -0.025 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of τ Andromedae from the Sun and relative movement
τ Andromedae is distant 680.58 light years from the Sun and it is moving towards the Sun at the speed of 14 kilometers per second.
Spectral properties of τ Andromedae
τ Andromedae belongs to spectral class B8 and has a luminosity class of III corresponding to a giant star.
The red dot in the diagram below shows where τ Andromedae is situated in the Hertzsprung–Russell diagram.
τ Andromedae star system properties
τ Andromedae 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 τ Andromedae double sysyem: