Photo of Pickering's triangle (also known as Fleming's triangle) and NGC 6979 / NGC 6974 (the more diffused clouds at the top center/left). This is the third part of the Cygnus loop / veil nebula, this part of the supernova remnant is fainter than the previous two parts of the loop I photographed. This explains in part why it was only discovered by in 1904 by Williamina Fleming (whereas the two writer part were discovered in 1784 by William Herschel). Williamina Fleming was a pioneer in stellar classification, she worked with other women at the Harvard college observatory. Their work in star classification resulted in the Henry Draper Catalogue, an extensive (225 300 stars in the first edition) classification of stars with their position and their spectra. Williamina is also credited with the discovery of 59 nebula (including the famous hors head nebula) more than 300 variable stars as well as (with Henry Norris Russell and Edward Charles Pickering) the discovery of white dwarfs (the remnants of dead sun-like stars).
