NGC 6337

NGC 6337, the Ghostly Cheerio or Cheerio Nebula, is a toroidal planetary nebula in the constellation Scorpius. It appears as a ring-shaped transparent nebula resembling a piece of the breakfast cereal Cheerios, hence the name. Filament and knots, and a faint shell surround the ring. Its magnitude is 11.90; its position in Scorpius is right ascension 17^h 22^m15.67^s, declination -38° 29' 01.73". The Ghostly Cheerio has a redshift value of -0.000236.
There is convincing evidence that a binary nucleus exists at the center of the nebula, with masses of 0.6 and 0.3 M⊙, and a separation of ≤ 1.26 R⊙, indicating a probable common envelope phase. The Ghostly Cheerio's projected radial expansion is slow, averaging.
NGC 6337 is contained within, but is not a part of, the larger nebula Sh 2-5.