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  |ref=harv

  |ref=harv

}} {{arXiv|1401.7960}}

}} {{arXiv|1401.7960}}

</ref> Ebenezer Porter Mason made deatailed observations of the Eastern region which have today been shown to be accurate. Later in 1904, Williamnina Flemning at Harvard Observatory discovered a fainter region of the nebula not observed by Herschel known as Flemning's Triangle. Although discovered by Flemning, it was originally named Pickering's Triangle after the Edward Charles Pickering, the director of the Harvard Observatory at the time.

</ref> Ebenezer Porter Mason made detailed observations of the Eastern region which have today been shown to be accurate. Later in 1904, Williamnina Flemning at Harvard Observatory discovered a fainter region of the nebula not observed by Herschel known as Flemning's Triangle. Although discovered by Flemning, it was originally named Pickering's Triangle after the Edward Charles Pickering, the director of the Harvard Observatory at the time.

==Properties and structure==

==Properties and structure==