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Kaus Australis - ε Sagittarii (epsilon Sagittarii)

Kaus Australis, also designated as ε Sagittarii (epsilon Sagittarii), is a double giant star in the constellation of Sagittarius.

Kaus Australis visual magnitude is 1.85, making it the 36th brightest star in the sky. Thanks to its high brightness, Kaus Australis is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Kaus Australis:

Color of Kaus Australis ⬤

Magnitude of Kaus Australis 1.85

Class Giant

VISIBILITY RIGHT NOW Kaus Australis - ε Sagittarii (epsilon Sagittarii) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of Kaus Australis

Kaus Australis 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 Kaus Australis are provided in the following table:

Right Ascension J2000 18h 24m 10s

Declination J2000 -34° 23’ 04”

Galactic Longitude 359.2°

Galactic Latitude -9.81°

Constellation Sagittarius

The simplified sky map below shows the position of Kaus Australis in the sky:

Finder chart Kaus Australis - ε Sagittarii (epsilon Sagittarii) star

Simplified finder chart for Kaus Australis - ε Sagittarii (epsilon Sagittarii).

Visibility of Kaus Australis 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 Kaus Australis - ε Sagittarii (epsilon 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: 124.4° RISE 0:52

Max altitude: 4.1° TRANSIT 2:58

Azimuth: 235.6° SET 5:00

RIGHT NOW Kaus Australis - ε Sagittarii (epsilon Sagittarii) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Kaus Australis

The image below is a photograph of Kaus Australis 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 Kaus Australis is -0.038 arcsec per year in Right Ascension and -0.124 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Kaus Australis - ε Sagittarii (epsilon Sagittarii) star

DSS2 image of Kaus Australis. The red arrow shows the motion of Kaus Australis during the next 1000 years (-0.63 arcmin in Right Ascension and -2.07 arcmin in declination);

Distance of Kaus Australis from the Sun and relative movement

Kaus Australis is distant 144.57 light years from the Sun and it is moving towards the Sun at the speed of 15 kilometers per second.

Distance (parsec) 44.35 pc

Distance (light year) 144.57 ly

Heliocentric radial velocity -15 km/s

Proper Motion RA -0.038 arcsec/year

Proper Motion Dec -0.124 arcsec/year

Spectral properties of Kaus Australis

Kaus Australis belongs to spectral class B9 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -1.38

Spectral Type B9III

Color Index (B-V) -0.03

Temperature of Kaus Australis 10516K

The red dot in the diagram below shows where Kaus Australis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of Kaus Australis. Attribution: Richard Powell / CC BY-SA

Kaus Australis star system properties

Kaus Australis 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 Kaus Australis double sysyem:

Main star magnitude 1.85

Secondary star magnitude 14.15

Magnitude difference 12.3

Separation 36.1 arcsec

Alternative designations of Kaus Australis

Proper Name Kaus Australis

Bayer designation ε Sagittarii
(epsilon Sagittarii)

Flamsteed designation 20 Sagittarii

Henry Draper Catalogue HD169022

SAO Catalogue SAO210091

Hipparcos Catalogue HIP90185

Durchmusterung Catalogue CD-3412784

FK5 Catalogue 689

In Evidence

Other stars in Sagittarius