Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:47  
clear_day Transit: 12:56  
SunsetSet: 21:06 south
sunny DaytimeWhat's Visible Now
All Constellations » Sagitta » 

θ Sagittae (theta Sagittae)

θ Sagittae is a multiple sub-giant star in the constellation of Sagitta.

θ Sagittae visual magnitude is 6.48. Because of its reltive faintness, θ Sagittae 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 θ Sagittae:

θ Sagittae (theta Sagittae) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 32°.

Celestial coordinates and finder chart of θ Sagittae

θ Sagittae 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 Sagittae are provided in the following table:

20h 09m 56s
+20° 54’ 55”

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

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

Visibility of θ Sagittae 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 θ Sagittae (theta Sagittae) 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: 69.1°
Max altitude: 59.4°
Azimuth: 290.9°
θ Sagittae (theta Sagittae) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of θ Sagittae

The image below is a photograph of θ Sagittae 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 Sagittae is 0.054 arcsec per year in Right Ascension and 0.101 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of θ Sagittae (theta Sagittae) star
DSS2 image of θ Sagittae. The red arrow shows the motion of θ Sagittae during the next 1000 years (0.90 arcmin in Right Ascension and 1.68 arcmin in declination);

Distance of θ Sagittae from the Sun and relative movement

θ Sagittae is distant 146.71 light years from the Sun and it is moving towards the Sun at the speed of 40 kilometers per second.

45.00 pc
146.71 ly
-40 km/s
0.054 arcsec/year
0.101 arcsec/year

Spectral properties of θ Sagittae

θ Sagittae belongs to spectral class F5 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

θ Sagittae star system properties

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

83.9 arcsec

Alternative designations of θ Sagittae

θ Sagittae
(theta Sagittae)
17 Sagittae