Your Guide to the Solar System and the Night Sky
Donate now! You'll help cover server costs, enhance the site and keep it ad-free.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:46  
clear_day Transit: 12:57  
SunsetSet: 21:08 south
sunny DaytimeWhat's Visible Now
All Constellations » Aquila » 

σ Aquilae (sigma Aquilae)

Altitude: -29.8°   Azimuth: 26.8°   Direction: North-North-East

σ Aquilae is a variable and multiple main-sequence star in the constellation of Aquila.

σ Aquilae visual magnitude is 5.17. Because of its reltive faintness, σ Aquilae 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 σ Aquilae:


σ Aquilae (sigma Aquilae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -29.8°
Azimuth: 26.8°
Direction: North-North-East

Celestial coordinates and finder chart of σ Aquilae

σ 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 σ Aquilae are provided in the following table:

19h 39m 11s
+05° 23’ 52”

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

Finder chart σ Aquilae (sigma Aquilae) star
Simplified finder chart for σ Aquilae (sigma Aquilae).

Visibility of σ 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 σ Aquilae (sigma 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: 84.6°
Max altitude: 43.9°
Azimuth: 275.4°
σ Aquilae (sigma Aquilae) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of σ Aquilae

The image below is a photograph of σ Aquilae 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 σ Aquilae is 0.001 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of σ Aquilae (sigma Aquilae) star
DSS2 image of σ Aquilae. The red arrow shows the motion of σ Aquilae during the next 100000 years (1.67 arcmin in Right Ascension and -1.67 arcmin in declination);

Distance of σ Aquilae from the Sun and relative movement

σ Aquilae is distant 682.01 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

209.21 pc
682.01 ly
-5 km/s
0.001 arcsec/year
-0.001 arcsec/year

Spectral properties of σ Aquilae

σ Aquilae belongs to spectral class B3 and has a luminosity class of V corresponding to a main-sequence star.


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

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

σ Aquilae star system properties

σ Aquilae 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 σ Aquilae double sysyem:

47.8 arcsec

Alternative designations of σ Aquilae

σ Aquilae
(sigma Aquilae)