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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: 6:50  
clear_day Transit: 12:11  
SunsetSet: 17:32
sleep NighttimeWhat's Visible Now?
All Constellations » Taurus » 

81 Tauri

Altitude: 12.6°   Azimuth: 279.5°   Direction: West

81 Tauri is a double star in the constellation of Taurus.

81 Tauri visual magnitude is 5.48. Because of its reltive faintness, 81 Tauri should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of 81 Tauri is 0.103 arcsec per year in Right Ascension and -0.023 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 81 Tauri star
DSS2 image of 81 Tauri. The red arrow shows the motion of 81 Tauri during the next 1000 years (1.72 arcmin in Right Ascension and -0.38 arcmin in declination);

Key facts about 81 Tauri


81 Tauri is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 12.6°
Azimuth: 279.5°
Direction: West

Celestial coordinates and finder chart of 81 Tauri

81 Tauri 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 81 Tauri are provided in the following table:

04h 30m 38s
+15° 41’ 30”

The simplified sky map below shows the position of 81 Tauri in the sky:

Finder chart 81 Tauri star
Simplified finder chart for 81 Tauri.

Visibility of 81 Tauri 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 81 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: 74.3°
Max altitude: 54.2°
Azimuth: 285.7°

Distance of 81 Tauri from the Sun and relative movement

81 Tauri is distant 144.57 light years from the Sun and it is moving far from the Sun at the speed of 39 kilometers per second.

44.35 pc
144.57 ly
39 km/s
0.103 arcsec/year
-0.023 arcsec/year

Spectral properties of 81 Tauri

81 Tauri belongs to spectral class A5


The red dot in the diagram below shows where 81 Tauri is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 81 Tauri. Attribution: Richard Powell / CC BY-SA

81 Tauri star system properties

81 Tauri is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the 81 Tauri double sysyem:

162 arcsec

Alternative designations of 81 Tauri