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public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:59 
Sunset: 21:16
wb_twilight   (Nautical Twilight)   What's Visible Now?

τ2 Aquarii (tau2 Aquarii)

Below the horizon.  Rise: 1:22 | Tran: 6:09 | Set: 10:57
Altitude: -21.5°   Azimuth: 84.9°   Direction: East

τ2 Aquarii is a variable and double hypergiant star of spectral class M0 in the constellation of Aquarius.

τ2 Aquarii visual magnitude is 4.01. Because of its moderate brightness, τ2 Aquarii is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Celestial coordinates and finder chart of τ2 Aquarii

Finder chart τ2 Aquarii (tau2 Aquarii) star
Simplified finder chart for τ2 Aquarii (tau2 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:

22h 49m 35s
-13° 35’ 32”
Image of τ2 Aquarii (tau2 Aquarii) star
DSS2 image of τ2 Aquarii. The red arrow shows the motion of τ2 Aquarii during the next 10000 years (-2.00 arcmin in Right Ascension and -6.33 arcmin in declination);

Key facts about τ2 Aquarii


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.

HR Diagram
H-R diagram showing the position of τ2 Aquarii. Attribution: Richard Powell / CC BY-SA

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:

132.5 arcsec

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.

116.55 pc
379.95 ly
1 km/s
-0.012 arcsec/year
-0.038 arcsec/year

Alternative designations of τ2 Aquarii

τ2 Aquarii
(tau2 Aquarii)

Visibility of τ2 Aquarii from your location

Today's τ2 Aquarii (tau2 Aquarii) rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):

Azimuth: 103.6°
Max altitude: 24.9°
Azimuth: 256.4°