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Cometary knots in the Helix Nebula. Cometary knots, also referred as globules, are structures observed in several nearby planetary nebulae (PNe), including the Helix Nebula (NGC 7293), the Ring Nebula (NGC 6720), the Dumbbell Nebula (NGC 6853), the Eskimo Nebula (NGC 2392), and the Retina Nebula (IC 4406).
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The Helix Nebula (also known as NGC 7293 or Caldwell 63) is a planetary nebula (PN) located in the constellation Aquarius. Discovered by Karl Ludwig Harding , most likely before 1824, this object is one of the closest of all the bright planetary nebulae to Earth. [ 3 ]
Helix Nebula: Planetary Nebula: 0.522 Aquarius: 7.3 C64 NGC 2362: Tau Canis Majoris Cluster: Open Cluster and Nebula: 5.1 Canis Major: 4.1 C65 NGC 253: Sculptor Galaxy: Spiral Galaxy: 9,800 Sculptor: 7.1 C66 NGC 5694 Globular Cluster: 113 Hydra: 10.2 C67 NGC 1097 Barred Spiral Galaxy: 47,000 Fornax: 9.3 C68 NGC 6729: R CrA Nebula: Nebula: 0.424 ...
Helix Nebula: NGC 7293: 1824 0.68 +0.15 −0.08: 7.6 Aquarius: Little Dumbbell Nebula: M76: ... Download as PDF; Printable version; In other projects Wikimedia ...
Download as PDF; Printable version; ... Cone Nebula; Crescent Nebula; Double Helix Nebula; ... NGC 7129, reflection nebula in Cepheus, ...
Download as PDF; Printable version; In other projects Appearance. ... English: The Helix Nebula: a Gaseous Envelope Expelled By a Dying Star About the Object.
appdia (optional) - the apparent diameter of the nebula, in degrees,minutes,seconds,milliseconds of arc; size_v – the apparent dimensions of the nebula; constellation – the constellation containing the nebula. Should be wikilinked. radius_ly (optional) – the radius of the nebula, in light years; radius_pc (optional) – the radius of the ...