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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
SunriseRise: 6:44  
clear_day Transit: 12:10  
SunsetSet: 17:38
sleep NighttimeWhat's Visible Now?
All Constellations » Capricornus » 

α1 Capricorni (alpha1 Capricorni)

Altitude: -48.8°   Azimuth: 335.0°   Direction: North-North-West

α1 Capricorni is a multiple supergiant star in the constellation of Capricornus.

α1 Capricorni visual magnitude is 4.24. Because of its moderate brightness, α1 Capricorni should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of α1 Capricorni is 0.023 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of α1 Capricorni (alpha1 Capricorni) star
DSS2 image of α1 Capricorni. The red arrow shows the motion of α1 Capricorni during the next 10000 years (3.83 arcmin in Right Ascension and 0.17 arcmin in declination);

Key facts about α1 Capricorni


α1 Capricorni (alpha1 Capricorni) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -48.8°
Azimuth: 335.0°
Direction: North-North-West

Celestial coordinates and finder chart of α1 Capricorni

α1 Capricorni 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 α1 Capricorni are provided in the following table:

20h 17m 38s
-12° 30’ 29”

The simplified sky map below shows the position of α1 Capricorni in the sky:

Finder chart α1 Capricorni (alpha1 Capricorni) star
Simplified finder chart for α1 Capricorni (alpha1 Capricorni).

Visibility of α1 Capricorni 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 α1 Capricorni (alpha1 Capricorni) 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: 102.5°
Max altitude: 26.0°
Azimuth: 257.5°

Distance of α1 Capricorni from the Sun and relative movement

α1 Capricorni is distant 686.32 light years from the Sun and it is moving towards the Sun at the speed of 26 kilometers per second.

210.53 pc
686.32 ly
-26 km/s
0.023 arcsec/year
0.001 arcsec/year

Spectral properties of α1 Capricorni

α1 Capricorni belongs to spectral class G3 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where α1 Capricorni is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of α1 Capricorni. Attribution: Richard Powell / CC BY-SA

α1 Capricorni star system properties

α1 Capricorni is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the α1 Capricorni double sysyem:

377.7 arcsec

Alternative designations of α1 Capricorni

α1 Capricorni
(alpha1 Capricorni)
5 Capricorni