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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: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
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All Constellations » Cancer » 

Asellus Australis - δ Cancri (delta Cancri)

Altitude: -19.7°   Azimuth: 10.7°   Direction: North

Asellus Australis, also designated as δ Cancri (delta Cancri), is a double hypergiant star in the constellation of Cancer.

Asellus Australis visual magnitude is 3.94. Because of its moderate brightness, Asellus Australis 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 Asellus Australis:


Asellus Australis - δ Cancri (delta Cancri) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -19.7°
Azimuth: 10.7°
Direction: North

Celestial coordinates and finder chart of Asellus Australis

Asellus Australis 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 Asellus Australis are provided in the following table:

08h 44m 41s
+18° 09’ 15”

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

Finder chart Asellus Australis - δ Cancri (delta Cancri) star
Simplified finder chart for Asellus Australis - δ Cancri (delta Cancri).

Visibility of Asellus 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 Asellus Australis - δ Cancri (delta Cancri) 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: 71.8°
Max altitude: 56.7°
Azimuth: 288.2°

Digitized Sky Survey image of Asellus Australis

The image below is a photograph of Asellus 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 Asellus Australis is -0.018 arcsec per year in Right Ascension and -0.228 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Asellus Australis - δ Cancri (delta Cancri) star
DSS2 image of Asellus Australis. The red arrow shows the motion of Asellus Australis during the next 1000 years (-0.30 arcmin in Right Ascension and -3.80 arcmin in declination);

Distance of Asellus Australis from the Sun and relative movement

Asellus Australis is distant 136.00 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

41.72 pc
136.00 ly
17 km/s
-0.018 arcsec/year
-0.228 arcsec/year

Spectral properties of Asellus Australis

Asellus Australis 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 Asellus Australis is situated in the Hertzsprung–Russell diagram.

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

Asellus Australis star system properties

Asellus 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 Asellus Australis double sysyem:

38.4 arcsec

Alternative designations of Asellus Australis

Asellus Australis
δ Cancri
(delta Cancri)