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.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
About 11[degrees] from Deneb Algedi is that other famous planetary in Aquarius, the Helix Nebula (NGC 7293).
Common examples are M57, the Ring Nebula in Lyra and NGC 7293, the Helix Nebula in Aquarius.
For a completely different planetary nebula, try the ghostly Helix Nebula, NGC 7293. To locate this puffy ring, begin at 2.5-magnitude Alpha ([alpha]) Pegasi, or Markab, on the southwest corner of the Great Square of Pegasus.
Considerably farther to the southeast are the other planetaries, both in Aquarius: the small, intense Saturn Nebula (NGC 7009) and the great-in-total-brightness but huge and thus low surface brightness Helix Nebula (NGC 7293).
Operators pointed the scope away from the incoming meteors and stopped with the Helix Nebula (NGC 7293) in Aquarius, the Water Carrier, in its sights.
Let's return to Aquarius, which is now riding high, and end on NGC 7293. The Helix is a huge planetary nebula, the corpse of a long dead star.
One night we tried for one of the difficult objects of the Northern Hemisphere, the famous Helix Nebula (NGC 7293).
Our next step is the Helix Nebula, NGC 7293 (Caldwell 63), 700 light-years away in Aquarius.
The Helix Nebula (NGC 7293) is an Aquarius must-see for tourists of the night sky.
But one planetary that seems to defy the norm is the Helix Nebula, NGC 7293, in Aquarius.
An O III also magically "lifts" ghostly planetaries, such as the Helix (NGC 7293) in Aquarius and the Owl (M97) in Ursa Major, out of a light-polluted sky.
These include the lovely but elusive Helix Nebula (NGC 7293), Abell 39 (a ghostly bluish bubble), and the obscure but rewarding PK 164+31.1.