Thursday, 16 July 2026

A little ramble through Musca the Fly

Musca (Latin for "the fly") is a small constellation in the deep southern sky. The constellation can be located just below the Southern Cross. It cannot be seen from Britain.

 It was one of 12 constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman, and it first appeared on a celestial globe 35 cm (14 in) in diameter published in 1597 (or 1598) in Amsterdam by Plancius and Jodocus Hondius.

 The first depiction of this constellation in a celestial atlas was in Johann Bayer's Uranometria of 1603. It was also known as Apis (Latin for "the bee") for 200 years.

Lacaille in 1776 renamed it to Musca Australis, the Southern Fly, to its then counterpart the now discarded constellation of Musca Borealis. The Australis part has now been discarded.

Alpha has a brightness of magnitude of 2.7 and is a class B2 star lying 315 light years away.

Beta lies 340 light years away and has a magnitude of 3.0 its a B2 class star.

Gamma is a B5 class star with a brightness of magnitude 3.9 lying at a distance of 325 light years.

Delta has a brightness of magnitude 3.7 and is a K2 class giant star at a distance of 91 light years.

There is one deep sky object of interest this is NGC 5189 or the Spiral Planetary Nebula. It was discovered by James Dunlop on July 1st 1826 from  Paramatta  in Australia. NGC 5189 is 1,780 light years from earth and with a magnitude of 8.2 it will need a good pair of binoculars or a small telescope to see it.


                                                      www.theramblingastronomer.co.uk

 

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