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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:46  
clear_day Transit: 12:51  
SunsetSet: 18:55 south
wb_twilight Nautical TwilightWhat's Visible Now
All Constellations » Aquila » 

51 Aquilae

Altitude: -38.7°   Azimuth: 308.5°   Direction: North-West

51 Aquilae is a double hypergiant star in the constellation of Aquila.

51 Aquilae visual magnitude is 5.39. Because of its reltive faintness, 51 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 51 Aquilae:


51 Aquilae is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -38.7°
Azimuth: 308.5°
Direction: North-West

Celestial coordinates and finder chart of 51 Aquilae

51 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 51 Aquilae are provided in the following table:

19h 50m 46s
-10° 45’ 48”

The simplified sky map below shows the position of 51 Aquilae in the sky:

Finder chart 51 Aquilae star
Simplified finder chart for 51 Aquilae.

Visibility of 51 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 51 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: 100.8°
Max altitude: 27.8°
Azimuth: 259.2°

Digitized Sky Survey image of 51 Aquilae

The image below is a photograph of 51 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 51 Aquilae is -0.03 arcsec per year in Right Ascension and 0.033 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 51 Aquilae star
DSS2 image of 51 Aquilae. The red arrow shows the motion of 51 Aquilae during the next 10000 years (-5.00 arcmin in Right Ascension and 5.50 arcmin in declination);

Distance of 51 Aquilae from the Sun and relative movement

51 Aquilae is distant 86.11 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

26.41 pc
86.11 ly
6 km/s
-0.03 arcsec/year
0.033 arcsec/year

Spectral properties of 51 Aquilae

51 Aquilae belongs to spectral class F0 and has a luminosity class of V corresponding to a hypergiant star.


The red dot in the diagram below shows where 51 Aquilae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 51 Aquilae. Attribution: Richard Powell / CC BY-SA

51 Aquilae star system properties

51 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 51 Aquilae double sysyem:

21.1 arcsec

Alternative designations of 51 Aquilae