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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
north SunriseRise: 7:48  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
wb_twilight Civil TwilightWhat's Visible Now?
All Constellations » Aquila » 

31 Aquilae

Altitude: 0.4°   Azimuth: 71.1°   Direction: East-North-East

31 Aquilae is a variable and multiple sub-giant star in the constellation of Aquila.

31 Aquilae visual magnitude is 5.16. Because of its reltive faintness, 31 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 31 Aquilae:


31 Aquilae is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 0.4°
Azimuth: 71.1°
Direction: East-North-East

Celestial coordinates and finder chart of 31 Aquilae

31 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 31 Aquilae are provided in the following table:

19h 24m 58s
+11° 56’ 39”

The simplified sky map below shows the position of 31 Aquilae in the sky:

Finder chart 31 Aquilae star
Simplified finder chart for 31 Aquilae.

Visibility of 31 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 31 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: 78.1°
Max altitude: 50.5°
Azimuth: 281.9°

Digitized Sky Survey image of 31 Aquilae

The image below is a photograph of 31 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 31 Aquilae is 0.722 arcsec per year in Right Ascension and 0.643 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 31 Aquilae star
DSS2 image of 31 Aquilae. The red arrow shows the motion of 31 Aquilae during the next 1000 years (12.03 arcmin in Right Ascension and 10.72 arcmin in declination);

Distance of 31 Aquilae from the Sun and relative movement

31 Aquilae is distant 49.39 light years from the Sun and it is moving towards the Sun at the speed of 100 kilometers per second.

15.15 pc
49.39 ly
-100 km/s
0.722 arcsec/year
0.643 arcsec/year

Spectral properties of 31 Aquilae

31 Aquilae belongs to spectral class G8 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where 31 Aquilae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 31 Aquilae. Attribution: Richard Powell / CC BY-SA

31 Aquilae star system properties

31 Aquilae is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the 31 Aquilae double sysyem:

105.6 arcsec

Alternative designations of 31 Aquilae