Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

θ Aquilae (theta Aquilae)

θ Aquilae is a double giant star in the constellation of Aquila.

θ Aquilae visual magnitude is 3.23. Because of its moderate brightness, θ Aquilae should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about θ Aquilae:

3.23
Giant
θ Aquilae (theta Aquilae) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 37°.

Celestial coordinates and finder chart of θ Aquilae

θ 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 θ Aquilae are provided in the following table:

20h 11m 18s
-00° 49’ 17”
41.58°
-18.08°
Aquila

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

Finder chart θ Aquilae (theta Aquilae) star
Simplified finder chart for θ Aquilae (theta Aquilae).

Visibility of θ Aquilae from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's θ Aquilae (theta Aquilae) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 90.8°
Max altitude: 37.7°
Azimuth: 269.2°
θ Aquilae (theta Aquilae) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of θ Aquilae

The image below is a photograph of θ 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 θ Aquilae is 0.038 arcsec per year in Right Ascension and 0.004 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of θ Aquilae (theta Aquilae) star
DSS2 image of θ Aquilae. The red arrow shows the motion of θ Aquilae during the next 10000 years (6.33 arcmin in Right Ascension and 0.67 arcmin in declination);

Distance of θ Aquilae from the Sun and relative movement

θ Aquilae is distant 286.97 light years from the Sun and it is moving towards the Sun at the speed of 27 kilometers per second.

88.03 pc
286.97 ly
-27 km/s
0.038 arcsec/year
0.004 arcsec/year

Spectral properties of θ Aquilae

θ Aquilae belongs to spectral class B9 and has a luminosity class of III corresponding to a giant star.

-1.49
B9III
11092K

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

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

θ Aquilae star system properties

θ 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 θ Aquilae double sysyem:

3.23
12.83
9.6
113.7 arcsec

Alternative designations of θ Aquilae

θ Aquilae
(theta Aquilae)
SAO144150
SAO144150