τ2 Aquarii (tau2 Aquarii)
τ2 Aquarii is a variable and double hypergiant star in the constellation of Aquarius.
τ2 Aquarii visual magnitude is 4.01. Because of its moderate brightness, τ2 Aquarii 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 τ2 Aquarii:
Celestial coordinates and finder chart of τ2 Aquarii
τ2 Aquarii is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of τ2 Aquarii are provided in the following table:
The simplified sky map below shows the position of τ2 Aquarii in the sky:
Visibility of τ2 Aquarii from your location
Digitized Sky Survey image of τ2 Aquarii
The image below is a photograph of τ2 Aquarii 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 τ2 Aquarii is -0.012 arcsec per year in Right Ascension and -0.038 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of τ2 Aquarii from the Sun and relative movement
τ2 Aquarii is distant 379.95 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.
Spectral properties of τ2 Aquarii
τ2 Aquarii belongs to spectral class M0 and has a luminosity class of III corresponding to a hypergiant star.
The red dot in the diagram below shows where τ2 Aquarii is situated in the Hertzsprung–Russell diagram.
τ2 Aquarii star system properties
τ2 Aquarii 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 τ2 Aquarii double sysyem: