α Horologii

Alpha Horologii is a yellow giant, far to the north of the rest of the constellation. It acts as the pivot of the swinging pendulum, which is what the constellation represents.

The star is in the same field of view as delta Hor and the 5 magnitude delta Caeli: binoculars, or due west of alpha Caeli a little over one binocular field.

Straddling the border with Caelum is the binocular binary h3643: 5.5, 8.6; 115, 70.4".

R Horologii is an interesting Mira-type variable in that it has one of the largest magnitude ranges known, from a quite bright 4.7 to an extremely faint 14.3, over a period of 407.6 days.

Finding the region where R Horologii will eventually appear could be an adventure. A familiarity with Eridanus is essential. From alpha Eri (Achernar) move north to chi and over to phi Eri. With phi Eri centred, move one binocular field east: binoculars.

Along with R Hor in this field is the pleasant binocular binary DUN 10: 7.6, 8.5; 70, 38.3".


From the stars in this field you can starhop south to the other fine binary here. Follow the stars iota and eta south two degrees to zeta and then a further eight degrees (about a binocular field and a half) to lambda Hor. If you move slightly to the west you'll bring in alpha Hydri.

Two degrees northeast of lambda is DUN 7: 7.7, 7.7; 97, 36.5".

With lambda centred, one binocular field south brings us to the bottom of the constellation, the region of the swinging pendulum's massive 'bob', made up of a clump of stars: binoculars.

All files associated with The Constellations Web Page are
1999-2014 by Richard Dibon-Smith.