The Constellation Horologium

by Dominic Ford
Horologium Horologium
The constellation Horologium. Roll mouse over to see labels.
Source: Stellarium.

Horologium is a small southern constellation which culminates at around midnight in November.

The name ‘Horologium’ is Latin for ‘clock’, and the constellation is usually depicted as a pendulum clock. The name was assigned to this sky area by Nicolas Louis de Lacaille in 1756.

Horologium has only two stars brighter than fifth magnitude, but does have a few deep sky objects of interest, including the globular cluster NGC 1261 and the barred spiral galaxy NGC 1512.

A very much more challenging cluster is Arp-Madore 1, the most distant known globular cluster in orbit around the Milky Way. However, at magnitude 16, a large telescope is needed to see it.

Date First Appeared
1756 (Lacaille)
Sky Area
0.6% of the sky
248.9 square degrees
Messier Objects
Horologium contains no Messier objects
Caldwell Objects
Horologium contains the following Caldwell object: C87.
The following constellations neighbor Horologium: Caelum, Dorado, Eridanus, Hydrus, Reticulum.
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Brightest Objects in Horologium

Stars Open Clusters Globular Clusters Galaxies
Stars Open Clusters Globular Clusters Galaxies
α-Hor (mag 3.9) NGC 1261 (mag 8.6) NGC 1433 (mag 10.0)
δ-Hor (mag 4.9) NGC 1512 (mag 10.5)
β-Hor (mag 5.0) IC 1970 (mag 12.4)
μ-Hor (mag 5.1) NGC 1311 (mag 12.9)
ζ-Hor (mag 5.2) IC 1959 (mag 13.0)
ν-Hor (mag 5.3) NGC 1510 (mag 13.2)
η-Hor (mag 5.3) NGC 1476 (mag 13.8)
HD 27588 (mag 5.3)
λ-Hor (mag 5.4)
ι-Hor (mag 5.4)
HD 22231 (mag 5.7)
HD 23719 (mag 5.7)
γ-Hor (mag 5.8)
TW Hor (mag 5.8)
HD 14641 (mag 5.8)
HD 20640 (mag 5.8)
HD 24706 (mag 5.9)
TU Hor (mag 6.0)
HD 18185 (mag 6.0)
HD 19948 (mag 6.1)
HD 17254 (mag 6.2)
HD 18265 (mag 6.2)
HD 16170 (mag 6.3)
HD 17326 (mag 6.3)
HD 15646 (mag 6.3)




Color scheme