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Tuesday 19 September 2017 - 21:15:06Posted by Bobby
Invention of Octans
Octanscontains the south celestial pole. The constellation, which represents a navigators octant, a predecessor of the sextant, was introduced in the 18th century by the French astronomer Nicolas Louis de Lacaille. Its brightest star is Nu Octantis, an orange giant of magnitude 3.7. Other than its location at the south celestial pole, there is little notable about Octans.
Depiction: The Octant
Highest in the Sky: October
Size Ranking: 50th
Coverage Area: 291 Sq. Degrees
Right Acension: 22 hours
Visibility: 1°N to 90°S
Collinder 411: Open cluster
NGC 2573: Galaxy
Best Viewed Objects/Stars
This is the nearest naked-eye star to the south celestial pole (lying about 1 degree away), although at magnitude 5.4 it is hardly prominent. It is a yellow-white giant star, 270 light-years away.
A close double star divisible with a small telescope. The two components are of magnitudes 5.5 and 7.1.