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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:40  
clear_day Transit: 12:10  
SunsetSet: 17:41
sunny DaytimeWhat's Visible Now?
All Constellations » Taurus » 

Ain - ε Tauri (epsilon Tauri)

Altitude: 24.5°   Azimuth: 89.6°   Direction: East

Ain, also designated as ε Tauri (epsilon Tauri), is a double giant star in the constellation of Taurus.

Ain visual magnitude is 3.53. Because of its moderate brightness, Ain should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of Ain is 0.107 arcsec per year in Right Ascension and -0.038 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Ain - ε Tauri (epsilon Tauri) star
DSS2 image of Ain. The red arrow shows the motion of Ain during the next 1000 years (1.78 arcmin in Right Ascension and -0.63 arcmin in declination);

Key facts about Ain


Ain - ε Tauri (epsilon Tauri) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 24.5°
Azimuth: 89.6°
Direction: East

Celestial coordinates and finder chart of Ain

Ain 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 Ain are provided in the following table:

04h 28m 36s
+19° 10’ 49”

The simplified sky map below shows the position of Ain in the sky:

Finder chart Ain - ε Tauri (epsilon Tauri) star
Simplified finder chart for Ain - ε Tauri (epsilon Tauri).

Visibility of Ain 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 Ain - ε Tauri (epsilon Tauri) 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: 70.8°
Max altitude: 57.7°
Azimuth: 289.2°

Distance of Ain from the Sun and relative movement

Ain is distant 154.94 light years from the Sun and it is moving far from the Sun at the speed of 39 kilometers per second.

47.53 pc
154.94 ly
39 km/s
0.107 arcsec/year
-0.038 arcsec/year

Spectral properties of Ain

Ain belongs to spectral class G9 and has a luminosity class of III corresponding to a giant star.


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

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

Ain star system properties

Ain is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Ain double sysyem:

181.6 arcsec

Alternative designations of Ain

ε Tauri
(epsilon Tauri)