Helix nebula

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Helix nebula

(hee -liks) (NGC 7293) A planetary nebula lying in the southern hemisphere about 140 parsecs away in the direction of Aquarius. It has the largest apparent diameter (0°.2) of any planetary nebula but at magnitude 6.5 is too faint to be seen with the naked eye.

Helix Nebula

[′hē‚liks ′neb·yə·lə]
(astronomy)
A planetary nebula in Aquarius about 140 parsecs (2.7 × 1015 miles or 4.3 × 1015 kilometers) distant that has a high helium abundance and the largest known diameter of any planetary nebula.
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References in periodicals archive ?
9 (~R CrA) 94 NGC 6744 95 NGC 6752 96 M55, NGC 6809 97 Melotte 227, Cr 411 98 M2, NGC 7089 99 M30, NGC 7099 100 NGC 7293, Helix
Common examples are M57, the Ring Nebula in Lyra and NGC 7293, the Helix Nebula in Aquarius.
9 (~R CrA) d CrA May-Oct 94 NGC 6744 x Pav Jul-Jan 95 NGC 6752 g Pav Jul-Jan 96 M55, NGC 6809 g Sgr May-Oct 97 Melotte 227, Cr 411 o Oct Jan-Dec 98 M2, NGC 7089 g Aqr Aug-Nov 99 M30, NGC 7099 g Cap Aug-Nov 100 NGC 7293, Helix p Aqr Aug-Nov Key: n: "Top-100" Number; T: type of object, x = galaxy, g = globular cluster, p = planetary nebula, n = bright nebula, o = open cluster, d = dark nebula; C: three-letter abbreviation for constellation; Vis.