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Hawaiian Astronomical Society
Constellations: Horologium -- When Clocks became Useful
A couple of final comments: The pendulum clock allowed much more accurate time keeping. A pendulum one meter long has a beat (one half swing) of almost exactly one second. Also, Huygens wrote one of the earliest discussions of extraterrestrial life called Cosmotheoros.
Click the map for a 916x1200 version of the above. Click here for a map better suited for use in the field.
This a more detailed view of the constellation. The map displays stars to magnitude 10, and deepsky objects to magnitude 12. Click here for a map better suited for use in the field.
Click here for a map better suited for use in the field.
| 57k JPEG NGC1512 is a spiral galaxy located in northeastern Horologium, 2.1° WSW of Alpha Horologii. Dreyer describes it as having an extremely faint ring. The remainder is bright (mag. 11), quite large (8.9'x5.6'), round, with a brighter middle. The ring Dreyer describes is an active star forming region, and is visible only in larger amateur instruments.
NGC1510 sits 5' to the south-west. Dreyer describes this small (1.3'x0.7'), faint (mag. 13.5) companion to NGC1512 as showing very gradually much brightening toward the middle. Image from the Digital Sky Survey.
| 19k JPEG NGC1433 is a barred spiral galaxy located in east-central Horologium. It forms the right angle of a triangle consisting of itself, Alpha Horologii, and Alpha Doradus. Dreyer describes it as very bright (mag. 10.8), large (6.4'x5.8'), moderately extended to the west, with a very abruptly very much brighter middle. Indeed, the center looks like a 10th magnitude star. The star forming ring, so prominent in photographs, is not visible in amateur telescopes. Image from the Digital Sky Survey, and given additional processing.
| 47k JPEG NGC1261 (Bennett 11, Caldwell 87) is a globular cluster located in west-central Horologium, 4.5° east of the mag. 5.2 Zeta Horologii. Dreyer describes it as bright (mag. 8.4), large (6.9'), round, and very resolvable (in a 12" telescope).