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Horologium (abbr. Hor, gen. Horologii)





The Pendulum Clock; 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.


Horologium constellation
Horologium. © 2003 Torsten Bronger.
Copied here under the terms of the GNU Free Documentation License



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Related categories

   • NOTABLE STARS
   • NEBULAE AND STAR CLUSTERS
   • GALAXIES