NGC6992 Eastern Veil

NGC6992 Eastern Veil


NGC6992 is approximately  1500 light years in the constellation Cygnus. It is a supernova remnant from an exploding about 5000 t0 10000 years ago. When finely resolved, some parts of the image appear to be rope-like filaments. The standard explanation is that the shock waves are so thin, less than one part in 50,000 of the radius, that the shell is visible only when viewed exactly edge-on, giving the shell the appearance of a filament. Undulations in the surface of the shell lead to multiple filamentary images, which appear to be intertwined. Even though the nebula has a relatively bright integrated magnitude of 7, it is spread over so large an area that the surface brightness is quite low, so the nebula is notorious among astronomers as being difficult to see. However, an observer can see the nebula clearly in a telescope using an OIII filter (a filter isolating the wavelength of light from doubly ionized oxygen), as almost all light from this nebula is emitted at this wavelength. An 8-inch (200 mm) telescope equipped with an OIII filter shows the delicate lacework apparent in photographs, and with an OIII filter almost any telescope could conceivably see this nebula. Some argue that it can be seen without any optical aid except an OIII filter held up to the eye.     Text from Wikipedia





Ha 300 min


OIII 300min


SII 420 min




Scope              Planewave 17in

Camera            Apogee U16

Mount               Paramount ME

Filters               Astrodon  Ha5nm  OIII3nm   SII5nm

Exposures       Ha 5hrs    OIII 5hrs   SII7hrs   20min subs

Location           Sierra Nevada Mountains CA.  Heavens Mirror Observatory  SRO       2013


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