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Horologium, The Clock Constellation

Horologium (Pronounciation:Hor-rol-o-gee-um, Abbrev:Hor, Latin:Horologii) is a constellation, one of 88 constellations that the night sky is divided into. The sky is not divided up equally between the constellations. Horologium takes up 248.885 sq. degrees of the night sky which equates to 0.6% of the night sky. The constellation gets its name as it name means The Clock . It was not one of the original constellations that had been devised by Ptolemy, instead it was created by Abbé Nicolas Louis de Lacaille years later.

Horologium is not a member of the Zodiac group of twelve constellations that appear when the Sun sets. Horologium is a southern hemispheric constellation which means it can't be seen easily or at all from the northern hemisphere.

The brightest star in Horologium is Alpha Horologii. There are 2 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site. There is a dedicated page for exoplanets in Horologium. For a list of named stars, that is stars that don't start HD or HIP, please visit Horologium Star List Page.

Horologium Star and Deep Space Object Count

The number of stars that have been catalogued as part of the Hipparcos Star Catalogue from Horologium is 707. The number of stars that are of magnitude 6.0 or lower in the constellation is 18. The number of stars in the constellation that make up the outline is 7.

There are no deep space objects that were identified by Charles Messier in this constellation. There are no non-Messier deep space objects in this constellation that are covered at present on this site.

Stars of Interest

The nearest star to Earth is HIP 12703 which is roughly about 32.51 Light Years from the Earth. The nearest star to the Earth with an exoplanet is HD 27631 which is about 148.39 Light Years. The furthest star that can be located in the constellation is HIP 16881 which is located about 40770.42 Light Years away from the Sun.

The dimmest star that can be seen in Horologium with the naked eye is TU Horologii. The dim star has an apparent magnitude of 5.98. The dimmest star that a person is able to see with their naked eye is 6.0 magnitude based on the table in the reference. Ref: University of Michigan

The caveat of these stars are that they are catalogued on this site. If you know of a star that is nearer or further then do let me know in the comments and I'll add it to the site. The stars mentioned are from the Hipparcos catalogue or have been added because of their special status.

There is no Greek Legend behind this constellation. It was created by Abbé Nicolas Louis de Lacaille to fill in the voids in the astronomical charts.

There are no major meteor showers that radiate from within this constellation.

Horologium Facts

Is a Zodiac Sign No
Brightest StarAlpha Horologii
Area248.885 sq. deg.
Percentage of Night Sky0.6%
Size Position58th
Hemisphere Southern
Site Exoplanet Count2
Meteor Shower Count0
Nearest StarHIP 12703
Nearest Star with Exoplanet(s)HD 27631
Dimmest StarTU Horologii
Furthest StarHIP 16881
Bright Star Count18
Hipparcos Star Count707
Main Star Count7
Messier Deep Space Object Count0
*Non-Messier Deep Space Object Count0
Bordering / Neighbouring / Surrounding ConstellationsEridanus

*Note: The number of Non-Messier Deep Space Object Count relates to how many are covered on this site not how many there are.

Horologium Constellation Map

Horologium Constellation Star Map

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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