21 Aquilae is a variable and double bright giant star in the constellation of Aquila.
21 Aquilae visual magnitude is 5.15. Because of its reltive faintness, 21 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 21 Aquilae:
Celestial coordinates and finder chart of 21 Aquilae
21 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 21 Aquilae are provided in the following table:
The simplified sky map below shows the position of 21 Aquilae in the sky:
Visibility of 21 Aquilae from your location
Today's 21 Aquilae rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):
Digitized Sky Survey image of 21 Aquilae
The image below is a photograph of 21 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 21 Aquilae is 0.009 arcsec per year in Right Ascension and -0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.
Distance of 21 Aquilae from the Sun and relative movement
21 Aquilae is distant 640.47 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.
Spectral properties of 21 Aquilae
21 Aquilae belongs to spectral class B8 and has a luminosity class of II corresponding to a bright giant star.
The red dot in the diagram below shows where 21 Aquilae is situated in the Hertzsprung–Russell diagram.
21 Aquilae star system properties
21 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 21 Aquilae double sysyem: