A mosaic of four images taken thru an h-alpha filter with an STL-1301E CCD camera thru Kopernik's 20-inch F/8.1 Ritchey Chretien Cassegrain telescope focal reduced to F/5.
here for a larger version of this image (big file).
"Pickering's Triangle" is the name for the portion of the Veil Nebula in the Constellation of Cygnus that is included in the Kopernik image above. It is much fainter than the two main loops that form this supernova remnant. It has no NGC number (though NGC 6979 is occasionally used to refer to it). It was discovered photographically in 1904 by Williamina Fleming (after the New General Catalogue was published), but credit went to Edward Charles Pickering, the director of her observatory, as was the custom of the day.
Classification: a part of the Veil
Nebula supernova remnant.
George Normandin, KAS
Ocotober 11th, 2011