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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: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
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All Constellations » Sagittarius » 

θ1 Sagittarii (theta1 Sagittarii)

Altitude: -3.6°   Azimuth: 148.3°   Direction: South-South-East

θ1 Sagittarii is a sub-giant star in the constellation of Sagittarius.

θ1 Sagittarii visual magnitude is 4.37. Because of its moderate brightness, θ1 Sagittarii 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 θ1 Sagittarii:


θ1 Sagittarii (theta1 Sagittarii) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -3.6°
Azimuth: 148.3°
Direction: South-South-East

Celestial coordinates and finder chart of θ1 Sagittarii

θ1 Sagittarii is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of θ1 Sagittarii are provided in the following table:

19h 59m 44s
-35° 16’ 35”

The simplified sky map below shows the position of θ1 Sagittarii in the sky:

Finder chart θ1 Sagittarii (theta1 Sagittarii) star
Simplified finder chart for θ1 Sagittarii (theta1 Sagittarii).

Visibility of θ1 Sagittarii 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 θ1 Sagittarii (theta1 Sagittarii) 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: 125.3°
Max altitude: 3.2°
Azimuth: 234.7°

Digitized Sky Survey image of θ1 Sagittarii

The image below is a photograph of θ1 Sagittarii 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 θ1 Sagittarii is 0.006 arcsec per year in Right Ascension and -0.026 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of θ1 Sagittarii (theta1 Sagittarii) star
DSS2 image of θ1 Sagittarii. The red arrow shows the motion of θ1 Sagittarii during the next 10000 years (1.00 arcmin in Right Ascension and -4.33 arcmin in declination);

Distance of θ1 Sagittarii from the Sun and relative movement

θ1 Sagittarii is distant 617.42 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

189.39 pc
617.42 ly
1 km/s
0.006 arcsec/year
-0.026 arcsec/year

Spectral properties of θ1 Sagittarii

θ1 Sagittarii belongs to spectral class B3 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where θ1 Sagittarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of θ1 Sagittarii. Attribution: Richard Powell / CC BY-SA

Alternative designations of θ1 Sagittarii

θ1 Sagittarii
(theta1 Sagittarii)