Pendulum clock (constellation)

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Pendulum Clock
Horologium constellation map.png
Latin name Horologium
Latin genitive Horologii
Abbreviation Hor
Right ascension 2124902 h 12 m 49 s to  04 h 20 m 18 s42018
declination 1329791−67 ° 02 ′ 09 ″ to  −39 ° 38 ′ 13 ″1606187
surface 248,885 deg²
rank 58
Completely visible 23.4 ° N to 90 ° S
Observation time for Central Europe not visible
Number of stars brighter than 3 mag 0
Brightest star (size) α Hor (3.85)
Meteor streams


Neighboring constellations
clockwise from north )
swell IAU ,
The Horologium constellation as seen with the naked eye
The Horologium constellation as seen with the naked eye

The pendulum clock ( Latin Horologium ) is a constellation of the southern sky.


The pendulum clock is an inconspicuous constellation consisting of a chain of faint stars. Only one is lighter than the 4th magnitude . It is found west of the bright star Achernar , the southernmost star of Eridanus . The constellation can only be fully observed from locations south of the 20th parallel . In the extreme south of Germany , the main star from the constellation Pendeluhr rises for a short time and only very low above the southern horizon.


The constellation was introduced in 1752 by the French astronomer Nicolas Louis de Lacaille under the name Horologium Oscillitorium . Lacaille combined the stars of the southern hemisphere into "new" constellations, which he named after technical equipment.

Celestial objects


B. Names or other designations size Lj Spectral class
α 3.85 m 200 K1 III
δ 4.93 m
R. 4.7 to 14.3 m 500 M7 III
β 4.98 m
μ 5.12 m
ζ 5.21 m
ν 5.25 m
η 5.30 m
μ 5.36 m
ι 5.40 m 50 G0 V
γ 5.73 m

α Horologii is a 200 light-years distant, orange shining star of the spectral class K1 III.

ι Horologii is 50 light years away. In 1998 an exoplanet was discovered near the star .

Variable stars

object size period Type
R Hor 4.7 m to 14.3 m 405 days Mira star

R Horologii is a variable star of the Mira type , which changes its brightness very strongly over a period of 405 days. During the maximum it can be seen as a reddish star with the naked eye. During the minimum one needs a middle telescope for observation . R Hor is about 500 light years away and belongs to the spectral class M7 III.

NGC objects

Messier (M) NGC other size Type Surname
1261 10.3 m Globular clusters
1433 9.9 m Galaxy

Are in the pendulum of NGC objects of the globular cluster NGC 1261 and the galaxy NGC 1433 .

See also

Web links

Commons : Constellation Pendulum Clock  - Collection of images, videos and audio files