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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: 6:08  
clear_day Transit: 12:59  
SunsetSet: 19:51
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All Constellations » Capricornus » 

τ Capricorni (tau Capricorni)

Altitude: 19.1°   Azimuth: 209.3°   Direction: South-South-West

τ Capricorni is a multiple giant star in the constellation of Capricornus.

τ Capricorni visual magnitude is 5.22. Because of its reltive faintness, τ Capricorni 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 τ Capricorni is 0.007 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 τ Capricorni (tau Capricorni) star
DSS2 image of τ Capricorni. The red arrow shows the motion of τ Capricorni during the next 10000 years (1.17 arcmin in Right Ascension and -3.67 arcmin in declination);

Key facts about τ Capricorni


τ Capricorni (tau Capricorni) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 19.1°
Azimuth: 209.3°
Direction: South-South-West

Celestial coordinates and finder chart of τ Capricorni

τ Capricorni 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 τ Capricorni are provided in the following table:

20h 39m 16s
-14° 57’ 16”

The simplified sky map below shows the position of τ Capricorni in the sky:

Finder chart τ Capricorni (tau Capricorni) star
Simplified finder chart for τ Capricorni (tau Capricorni).

Visibility of τ Capricorni 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 τ Capricorni (tau Capricorni) 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: 105.0°
Max altitude: 23.6°
Azimuth: 255.0°

Distance of τ Capricorni from the Sun and relative movement

τ Capricorni is distant 1,752.69 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

537.63 pc
1,752.69 ly
-5 km/s
0.007 arcsec/year
-0.022 arcsec/year

Spectral properties of τ Capricorni

τ Capricorni belongs to spectral class B6 and has a luminosity class of III corresponding to a giant star.


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

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

τ Capricorni star system properties

τ Capricorni 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 τ Capricorni double sysyem:

0.3 arcsec

Alternative designations of τ Capricorni

τ Capricorni
(tau Capricorni)
14 Capricorni