Horologium

Horologium

Constellation
List of stars in Horologium
Abbreviation	Hor
Genitive	Horologii
Pronunciation	/ˌhɒrɵˈlɒdʒiəm/; genitive /ˌhɒrɵˈlɒdʒiaɪ/
Symbolism	the Pendulum Clock
Right ascension	3 h
Declination	−60°
Quadrant	SQ1
Area	249 sq. deg. (58th)
Main stars	6
Bayer/Flamsteed stars	10
Stars with planets	1
Stars brighter than 3.00m	0
Stars within 10.00 pc (32.62 ly)	1
Brightest star	α Hor (3.85m)
Nearest star	GJ 1061 (11.99 ly, 3.66 pc)
Messier objects	none
Meteor showers	????? ?????
Bordering constellations	Eridanus Hydrus Reticulum Dorado Caelum
Visible at latitudes between +30° and −90°. Best visible at 21:00 (9 p.m.) during the month of December.

Horologium is a small and faint constellation in the southern sky (declination around −60 degrees). Its name is Latin for clock. It was created in the 18th century by Abbé Nicolas Louis de Lacaille, who originally named it Horologium Oscillitorium after the pendulum clock to honour its inventor, Christiaan Huygens. The name has since been shortened to be less cumbersome.

One of the few objects of interest to amateur observers is R Horologii, a Mira variable with one of the largest magnitude ranges known. The globular cluster AM1 is found in the constellation, the most remotely known globular cluster in the Milky Way at a distance of 398 000 light years.

See also

• Horologium Supercluster

References

• Ian Ridpath and Wil Tirion (2007). Stars and Planets Guide, Collins, London. ISBN 978-0007251209. Princeton University Press, Princeton. ISBN 978-0691135564.

External links

• The Deep Photographic Guide to the Constellations: Horologium
• Starry Night Photography - Horologium Constellation
• Star Tales – Horologium