Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:54  
clear_day Transit: 12:49  
SunsetSet: 18:43 south
sleep NighttimeWhat's Visible Now
All Constellations » Aries » 

τ2 Arietis (tau2 Arietis)

Altitude: 44.5°   Azimuth: 115.9°   Direction: East-South-East

τ2 Arietis is a giant star in the constellation of Aries.

τ2 Arietis visual magnitude is 5.09. Because of its reltive faintness, τ2 Arietis 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 τ2 Arietis:


τ2 Arietis (tau2 Arietis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 44.5°
Azimuth: 115.9°
Direction: East-South-East

Celestial coordinates and finder chart of τ2 Arietis

τ2 Arietis 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 Arietis are provided in the following table:

03h 22m 45s
+20° 44’ 30”

The simplified sky map below shows the position of τ2 Arietis in the sky:

Finder chart τ2 Arietis (tau2 Arietis) star
Simplified finder chart for τ2 Arietis (tau2 Arietis).

Visibility of τ2 Arietis from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

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

Azimuth: 69.3°
Max altitude: 59.3°
Azimuth: 290.7°

Digitized Sky Survey image of τ2 Arietis

The image below is a photograph of τ2 Arietis 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 Arietis is -0.044 arcsec per year in Right Ascension and -0.022 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of τ2 Arietis (tau2 Arietis) star
DSS2 image of τ2 Arietis. The red arrow shows the motion of τ2 Arietis during the next 10000 years (-7.33 arcmin in Right Ascension and -3.67 arcmin in declination);

Distance of τ2 Arietis from the Sun and relative movement

τ2 Arietis is distant 318.67 light years from the Sun and it is moving far from the Sun at the speed of 2 kilometers per second.

97.75 pc
318.67 ly
2 km/s
-0.044 arcsec/year
-0.022 arcsec/year

Spectral properties of τ2 Arietis

τ2 Arietis belongs to spectral class K3 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where τ2 Arietis is situated in the Hertzsprung–Russell diagram.

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

Alternative designations of τ2 Arietis

τ2 Arietis
(tau2 Arietis)