Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

α1 Capricorni (alpha1 Capricorni)

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 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 α1 Capricorni:

4.24
Supergiant
α1 Capricorni (alpha1 Capricorni) is below the horizon from Greenwich, United Kingdom [change].

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”
31.09°
-24.7°
Capricornus

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 [change]
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 [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 102.5°
Max altitude: 26.0°
Azimuth: 257.5°
α1 Capricorni (alpha1 Capricorni) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of α1 Capricorni

The image below is a photograph of α1 Capricorni 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 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);

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.

-2.38
G3I
4581K

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:

4.24
4.64
0.4
377.7 arcsec

Alternative designations of α1 Capricorni

α1 Capricorni
(alpha1 Capricorni)
5 Capricorni
SAO163422
SAO163422