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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: 6:50  
clear_day Transit: 12:11  
SunsetSet: 17:32
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All Constellations » Horologium » 

α Horologii (alpha Horologii)

Altitude: -34.9°   Azimuth: 243.8°   Direction: West-South-West

α Horologii is a giant star in the constellation of Horologium.

α Horologii visual magnitude is 3.86. Because of its moderate brightness, α Horologii 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 α Horologii is 0.046 arcsec per year in Right Ascension and -0.209 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of α Horologii (alpha Horologii) star
DSS2 image of α Horologii. The red arrow shows the motion of α Horologii during the next 1000 years (0.77 arcmin in Right Ascension and -3.48 arcmin in declination);

Key facts about α Horologii


α Horologii (alpha Horologii) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -34.9°
Azimuth: 243.8°
Direction: West-South-West

Celestial coordinates and finder chart of α Horologii

α Horologii 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 α Horologii are provided in the following table:

04h 14m 00s
-42° 17’ 39”

The simplified sky map below shows the position of α Horologii in the sky:

Finder chart α Horologii (alpha Horologii) star
Simplified finder chart for α Horologii (alpha Horologii).

Visibility of α Horologii from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

α Horologii (alpha Horologii) is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of α Horologii from the Sun and relative movement

α Horologii is distant 117.06 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

35.91 pc
117.06 ly
22 km/s
0.046 arcsec/year
-0.209 arcsec/year

Spectral properties of α Horologii

α Horologii belongs to spectral class K1 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where α Horologii is situated in the Hertzsprung–Russell diagram.

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

Alternative designations of α Horologii

α Horologii
(alpha Horologii)