Tuesday 19 September 2017 - 20:44:26 Posted by  Bobby

 Invention of Lacerta

Lacerta is a small and insignificant constellation of the northern sky on the edge of the Milky Way, sandwiched between Cygnus and Andromeda. It was introduced in the 17th century by the polish astronomer Johannes Hevelius. Its brightest star is Alpha Lacertae, magnitude 3.8. Three naked-eye novas have erupted within its boundaries during the late 20th century.

 The Facts

  • Depiction: The Lizard
  • Pronounced: la-SIR-tah
  • Genitive: Lacertae
  • Abbreviation: Lac
  • Highest in the Sky: September to October
  • Size Ranking: 68th
  • Coverage Area: 201 Sq. Degrees
  • Right Acension: 22 hours
  • Declination: 45°
  • Visibility: 90°N to 33°S

 Notable Objects

  • 8 Lacertae: Quadruple star system
  • IC 5217: Planetary nebula
  • NGC 7209: Open cluster
  • NGC 7243: Open Cluster
  • NGC 7245: Open Cluster

 Best Viewed Objects/Stars

BL Lacertae

 The nucleus of a distant elliptical galaxy, originally classified as a variable star, hence its designation. It has given its name to a class of similar objects, the BL Lacertae (or BL Lac) objects, which are thought to be galaxies with powerful energy sources, perhaps massive black holes, at their centers. BL Lacertae varies between about 12th and 16th magnitudes.

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