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 AbbÃ© 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 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.
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 40770.4 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.
|Is a Zodiac Sign||No|
|Brightest Star||Alpha Horologii|
|Area||248.885 sq. deg.|
|Percentage of Night Sky||0.6%|
|Site Exoplanet Count||1|
|Meteor Shower Count||0|
|Nearest Star||HIP 12703|
|Nearest Star with Exoplanet(s)||HD 27631|
|Dimmest Star||TU Horologii|
|Furthest Star||HIP 16881|
|Bright Star Count||18|
|Hipparcos Star Count||707|
|Main Star Count||7|
|Messier Deep Space Object Count||0|
|*Non-Messier Deep Space Object Count||0|
|Bordering / Neighbouring / Surrounding Constellations||Eridanus|
*Note: The number of Non-Messier Deep Space Object Count relates to how many are covered on this site not how many there are.
The map was generated using Night Vision, an awesome free application by Brian Simpson.
|Star||Distance (Lt. Yrs.)||Exoplanet Count||Declination||Right Ascension|
|HD 27631||148.39||1||-41d 57` 36.1||04h 19m 45.50|
As there's so many stars in the cosmos, not all the stars are listed here. The site has lots of stars not listed so if your star isn't listed and you know the Henry Draper or Hipparcos ID, type https://www.universeguide.com/star/ then followed by the HIPNNNNNN or HDNNNN where NNNNN is the number part of the name. The stars that I do list have either a traditional name, a bayer or other classification name.
|Star||Distance (Lt. Yrs.)||Declination||Right Ascension|
|Alpha Horologii||115.01||-42d 17` 37.9||04h 14m 00.08|
|Beta Horologii||294.64||-64d 04` 16.7||02h 58m 47.77|
|Delta Horologii||178.82||-41d 59` 37.5||04h 10m 50.43|
|Eta Horologii||148.59||-52d 32` 35.1||02h 37m 24.26|
|Gamma Horologii||182.62||-63d 42` 16.3||02h 45m 27.45|
|Iota Horologii||55.99||-50d 48` 03.0||02h 42m 33.16|
|Lambda Horologii||161.07||-60d 18` 41.9||02h 24m 53.99|
|Mu Horologii||141.56||-59d 44` 15.4||03h 03m 36.90|
|Nu Horologii||164.56||-62d 48` 23.7||02h 49m 01.37|
|R Horologii||685.22||-49d 53` 23.0||02h 53m 52.65|
|TU Horologii||392.49||-47d 22` 30.6||03h 30m 36.90|
|TW Horologii||1048.76||-57d 19` 17.7||03h 12m 33.14|
|TZ Horologii||753.26||-66d 29` 38.5||02h 25m 26.48|
|Zeta Horologii||160.12||-54d 32` 59.7||02h 40m 39.58|
|K||Light Orange Star 3,700 - 5,200k||224|
|F||Yellow-White 6,000 - 7,500k||186|
|G||Yellow 5,200 - 6,000k||157|
|A||White 7,500 - 10,000k||62|
|M||Red Dwarf Star <3,700k||38|
|B||Blue-White 10,500 - 30,000k||7|
|VI||VI Type Sub-Dwarf Star||1|
|sd||sd Type SubDwarf Star||1|
|S||S-Type Carbon Star||1|
|C||C-Type Carbon Star||1|