The Winter Triangle, or the Great Southern Triangle, is an asterism formed by three bright stars in three prominent winter constellations.
The Winter Triangle is prominent in the night sky in the northern hemisphere during the winter months, from December to March.
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The nebula has the designation NGC 6618 in the New General Catalogue. It is also known as the Swan Nebula, Horseshoe Nebula, Lobster Nebula, or Checkmark Nebula.
Read More »Omega Nebula – Messier 17