Tuesday 19 September 2017 - 21:15:06 Posted by  Bobby

 Invention of Octans

Octans contains 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.

 The Facts

  • Depiction: The Octant
  • Pronounced: OCK-tanz
  • Genitive: Octantis
  • Abbreviation: Oct
  • Highest in the Sky: October
  • Size Ranking: 50th
  • Coverage Area: 291 Sq. Degrees
  • Right Acension: 22 hours
  • Declination: -85°
  • Visibility: 1°N to 90°S

 Notable Objects

  • Collinder 411: Open cluster
  • NGC 2573: Galaxy

 Best Viewed Objects/Stars

Sigma Octantis

 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.

Lambda Octantis

 A close double star divisible with a small telescope. The two components are of magnitudes 5.5 and 7.1.


 Where to?

Back To List 

Up Next- Ophiuchus 



0/5 : Not rated

Share this


Username or Email:


[ ]
[ ]
[ ]