Sunday, April 22, 2012

Superb Northern Summer Deep Sky Objects Move in From the East!

"Superb Northern Summer Deep Sky Objects Move in From the East!"," In the Northern Hemisphere, summer's deep sky objects start to make an appearance in the late evenings -- favourite bright stars such as Vega in Lyra and Arcturus in Boötes make a return from the east, and with them some stunning Messier deep sky objects. Much lower down, I should have been able to see M3 in the constellation Canes Venatici, and M57 (the Ring Nebula) in the constellation of Lyra, but pretty bad light pollution from local industry towards my eastern horizon severely restricts observing low down deep sky objects with low surface brightness, such as planetary nebulae, galaxies and star clusters. Sometimes, as in the case of M81 (Bodes Nebula) and M82 (the Cigar Galaxy) in Ursa Major, the smaller eyepiece and wider angular field of view allows for some attractive flamings of deep sky objects together. In my location, with moderate light pollution and no filter, most deep sky objects, being so faint, really don't bear greater magnification with a 200mm aperture reflector, except of course, bright star clusters and objects such as M42, the Orion Nebula. M92 alternatively known as NGC 6341 was discovered in 1777 by Johann Ebert Bode, and has an apparent magnitude of +6. Charles Messier independently rediscovered it and catalogued it on March 18, 1781. M92 is visible to the naked eye under very good conditions and a showpiece through either a telescope or binoculars. 8, and has an angular size of 20 arc minutes. M13 contains several 100,000 stars, and in 1974 was a target for one of the first radio messages addressed to possible extra-terrestrial intelligent races, sent by the large radio telescope at Arecibo. 

Coffee Shop Millionaire

No comments:

Post a Comment