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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 » Aquila » 

τ Aquilae (tau Aquilae)

Altitude: 43.2°   Azimuth: 154.5°   Direction: South-South-East

τ Aquilae is a giant star in the constellation of Aquila.

τ Aquilae visual magnitude is 5.52. Because of its reltive faintness, τ Aquilae 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 Aquilae is 0.016 arcsec per year in Right Ascension and 0.011 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of τ Aquilae (tau Aquilae) star
DSS2 image of τ Aquilae. The red arrow shows the motion of τ Aquilae during the next 10000 years (2.67 arcmin in Right Ascension and 1.83 arcmin in declination);

Key facts about τ Aquilae

5.52
Giant

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

Altitude: 43.2°
Azimuth: 154.5°
Direction: South-South-East

Celestial coordinates and finder chart of τ Aquilae

τ Aquilae 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 Aquilae are provided in the following table:

20h 04m 08s
+07° 16’ 41”
48.01°
-12.57°
Aquila

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

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

Visibility of τ Aquilae 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 Aquilae (tau Aquilae) 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: 82.7°
Max altitude: 45.8°
Azimuth: 277.3°

Distance of τ Aquilae from the Sun and relative movement

τ Aquilae is distant 526.66 light years from the Sun and it is moving towards the Sun at the speed of 28 kilometers per second.

161.55 pc
526.66 ly
-28 km/s
0.016 arcsec/year
0.011 arcsec/year

Spectral properties of τ Aquilae

τ Aquilae belongs to spectral class K0

-0.52
K0
4603K

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

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

Alternative designations of τ Aquilae

τ Aquilae
(tau Aquilae)
SAO125403
SAO125403