Pendulum clock (constellation)
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Constellation Pendulum Clock |
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| Latin name | Horologium |
| Latin genitive | Horologii |
| Abbreviation | Hor |
| Right ascension | 02 h 12 m 49 s to 04 h 20 m 18 s |
| declination | −67 ° 02 ′ 09 ″ to −39 ° 38 ′ 13 ″ |
| 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 |
no |
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Neighboring constellations ( clockwise from north ) |
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| swell | IAU , |
 The Horologium constellation as seen with the naked eye |
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The pendulum clock ( Latin Horologium ) is a constellation of the southern sky.
description
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.
history
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
Stars
| 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 .
