A

David

Darling

Horologium (abbr. Hor, gen. Horologii)

Horologium constellation

Horologium. © 2003 Torsten Bronger.


Horologium, the Pendulum Clock, is a faint southern constellation. Its only star brighter than magnitude 4.0 is Alpha Hor (visual magnitude 3.85; absolute magnitude 1.07; spectral type K1III; distance 117 light-years; R.A. 4h 14m, Dec. -42° 18'). One of the few objects of interest to amateur observers is R Horologium, a Mira variable with a period of 407.6 days and one the largest magnitude ranges known: 4.7 to 14.3. There are two globular clusters, both very faint, one of which, AM1, is the most remote in the Milky Way Galaxy at an incredible distance of 390,000 light years.

 

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