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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: 7:49  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sunny DaytimeWhat's Visible Now?
All Constellations » Sagittarius » 

15 Sagittarii

Altitude: 10.2°   Azimuth: 143.4°   Direction: South-East

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

15 Sagittarii visual magnitude is 5.38. Because of its reltive faintness, 15 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 15 Sagittarii:


15 Sagittarii is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 10.2°
Azimuth: 143.4°
Direction: South-East

Celestial coordinates and finder chart of 15 Sagittarii

15 Sagittarii 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 15 Sagittarii are provided in the following table:

18h 15m 12s
-20° 43’ 41”

The simplified sky map below shows the position of 15 Sagittarii in the sky:

Finder chart 15 Sagittarii star
Simplified finder chart for 15 Sagittarii.

Visibility of 15 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 15 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: 110.7°
Max altitude: 17.8°
Azimuth: 249.3°

Digitized Sky Survey image of 15 Sagittarii

The image below is a photograph of 15 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 15 Sagittarii is 0.003 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.

Image of 15 Sagittarii star
DSS2 image of 15 Sagittarii. The red arrow shows the motion of 15 Sagittarii during the next 100000 years (5.00 arcmin in Right Ascension and 5.00 arcmin in declination);

Distance of 15 Sagittarii from the Sun and relative movement

15 Sagittarii is distant 32,600,000.00 light years from the Sun and it is moving towards the Sun at the speed of 6 kilometers per second.

10,000,000.00 pc
32,600,000.00 ly
-6 km/s
0.003 arcsec/year
0.003 arcsec/year

Spectral properties of 15 Sagittarii

15 Sagittarii belongs to spectral class B0 and has a luminosity class of I corresponding to a hypergiant star.


The red dot in the diagram below shows where 15 Sagittarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 15 Sagittarii. Attribution: Richard Powell / CC BY-SA

Alternative designations of 15 Sagittarii

15 Sagittarii