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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: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sleep NighttimeWhat's Visible Now?
All Constellations » Sagittarius » 

18 Sagittarii

Altitude: -67.3°   Azimuth: 331.3°   Direction: North-North-West

18 Sagittarii is a hypergiant star in the constellation of Sagittarius.

18 Sagittarii visual magnitude is 5.6. Because of its reltive faintness, 18 Sagittarii 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 18 Sagittarii:


18 Sagittarii is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -67.3°
Azimuth: 331.3°
Direction: North-North-West

Celestial coordinates and finder chart of 18 Sagittarii

18 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 18 Sagittarii are provided in the following table:

18h 25m 01s
-30° 45’ 24”

The simplified sky map below shows the position of 18 Sagittarii in the sky:

Finder chart 18 Sagittarii star
Simplified finder chart for 18 Sagittarii.

Visibility of 18 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 18 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: 120.8°
Max altitude: 7.8°
Azimuth: 239.2°

Digitized Sky Survey image of 18 Sagittarii

The image below is a photograph of 18 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 18 Sagittarii is -0.123 arcsec per year in Right Ascension and -0.072 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 18 Sagittarii star
DSS2 image of 18 Sagittarii. The red arrow shows the motion of 18 Sagittarii during the next 1000 years (-2.05 arcmin in Right Ascension and -1.20 arcmin in declination);

Distance of 18 Sagittarii from the Sun and relative movement

18 Sagittarii is distant 653.31 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

200.40 pc
653.31 ly
-19 km/s
-0.123 arcsec/year
-0.072 arcsec/year

Spectral properties of 18 Sagittarii

18 Sagittarii belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 18 Sagittarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 18 Sagittarii. Attribution: Richard Powell / CC BY-SA

Alternative designations of 18 Sagittarii

18 Sagittarii