Universe Guide

Horologium, The Clock Constellation

Horologium Constellation Star Map

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. Horologium is the 58th largest in terms of size in the night sky.

The constellation 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.

There are 6 stars that make up the main constellation. The hipparcos satellite scanned and detailed 707 stars. There are 18 stars that can be seen with the naked eye in the constellation on a very clear night sky.

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.

There are 2 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site. There is a dedicated page for exoplanets in Horologium.

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.

The image at the top right of this page was generated using Night Vision, a free to use and download application by Brian Simspon.

Distance to Horologium

You can't just go to one location and arrive at the constellation because the constellation is made up of stars at different locations and different distances. The nearest main star in the constellation is at a distance of 55.99 light years and the furthest main star is a distance of 294.64 light years. The average distance to the main stars is 152.65 light years.

Horologium Star Facts

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.

HIP 12703, Horologium's Nearest Star

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.

HIP 16881, Horologium's Furthest Star

The furthest star that is located in the constellation is HIP 16881 and it is 40770.42 light years away from the Sun.

Alpha Horologii, Brightest Star in Horologium

The brightest star in Horologium is Alpha Horologii and is located about 92.50 light years from the Sun. The star has a apparent magnitude of 3.85 but an absolute magnitude of 1.11 when the star is viewed from a distance of 10 Parsecs or 32.6 Light Years. The star is recognised as being the brightest in the constellation as it has the Bayer status of Alpha.

TU Horologii, Horologium's Dimmest Visible Star

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.

Horologium Mythology

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 in the southern hemisphere.

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
Brightest StarAlpha Horologii
Dimmest StarTU Horologii
Furthest StarHIP 16881
Bright Star Count18
Hipparcos Star Count707
Main Star Count6
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.

List of Deep Space Objects (Galaxies, Nebulas, Supernovas, etc) in Horologium

NameTypeDistanceDeclinationRight Ascension
NGC 1261Globular Cluster-55 12 58.403 12 16m 21
NGC 1433Barred Spiral Galaxy-47 13 19.4903 42 01m 553
NGC 1448Spiral Galaxy-44 38 41.3803 44 31m 915
NGC 1483Barred Spiral Galaxy-47 28 39.0603 52 47m 608
NGC 1512Barred Spiral Galaxy30,000,000-43 20 55.8604 03 54m 281

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